Valve Rotor Spring Coupling for Precise Flow Opening Control
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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 shaft, leading to inconsistent fluid flow rates.
Innovation Solution
A valve device with a housing, stationary disk, drive device, shaft, and rotor, where a first torsion spring urges the shaft relative to the housing and a second torsion spring urges the lever relative to the shaft, limiting rattling and maintaining precise control over the opening degree of the flow passage holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single torsion spring is used to urge the shaft, then the structure is simpler, but the load on the drive device increases and control precision decreases
Solution Approach 1:
The single torsion spring is divided into two separate torsion springs: a first torsion spring that urges the shaft relative to the housing, and a second torsion spring that urges the lever relative to the shaft. This segmentation distributes the urging function across two independent components, reducing the load on the drive device while maintaining or improving control precision through distributed torque application.
2Device complexity
If the disk and shaft are directly connected without rattling limitations, then the structure is simpler, but variations in opening degree occur due to circumferential rattling
Solution Approach 1:
The patent incorporates rattling limitation mechanisms in advance between the disk and shaft connection. By providing pre-designed clearance limits and mechanical constraints before operation begins, the system prevents excessive circumferential movement that would cause opening degree variations, ensuring consistent valve control without requiring complex active compensation systems.
3Device complexity
If the drive disk is fixed to the shaft, then the structure is simpler, but the drive device load increases
Solution Approach 1:
The drive disk is made displaceable in the axial direction relative to the shaft while maintaining rotational coupling through the lever mechanism. This dynamic arrangement allows the drive disk to move axially to accommodate torque fluctuations and reduce peak loads on the drive device, while the lever ensures integral rotation is transmitted to the shaft for precise control.
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 solution effectively limits variations in the opening degrees of the flow passage holes, ensuring consistent fluid flow rates and reducing the load on the drive device by distributing the torsion spring forces between two springs, thereby enhancing the accuracy and reliability of the valve operation.
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
A valve device includes a housing, a stationary disk, a drive device, a shaft and a rotor. The stationary disk is fixed at an inside of the housing and has at least one flow passage hole. The shaft is rotated about a central axis by the drive device. The rotor increases or decreases an opening degree of the at least one flow passage hole. The rotor includes: a drive disk that slides relative to the stationary disk; and a lever that is fixed to the drive disk and couples between the drive disk and the shaft. A first torsion spring is placed between the housing and the shaft and urges the shaft relative to the housing in a circumferential direction around the central axis, and a second torsion spring is placed between the shaft and the lever and urges the lever relative to the shaft in the circumferential direction.