Rotary Valve Stator Locking Structure for Flow Rate Accuracy
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Solution Overview
Problem
Existing valve devices experience misalignment of the stator in the circumferential direction due to fitting tolerance, leading to deterioration of fluid flow rate accuracy.
Innovation Solution
The valve device incorporates an engaging protrusion and recess structure between the stator and housing to restrict the stator from rotating in the circumferential direction, reducing misalignment and enhancing flow rate accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the stator is installed in the housing without additional restriction mechanisms, then the device complexity is reduced, but the stator misalignment in the circumferential direction occurs due to fitting tolerance, deteriorating fluid flow rate accuracy
Solution Approach 1:
An engaging structure consisting of engaging protrusions and engaging recesses is introduced as an intermediary element between the stator and housing. This structure mediates the connection between the two components, preventing circumferential misalignment while maintaining a relatively simple overall device structure. The engaging protrusions are formed on the outer circumferential side surface of the stator, and the engaging recesses are formed on the inner circumferential side surface of the housing, creating a mechanical interlock that eliminates fitting tolerance issues.
2Manufacturing precision
If the engaging protrusion and recess structure is added to restrict stator rotation, then the stator misalignment is reduced and flow rate accuracy is improved, but the device complexity increases
Solution Approach 1:
The engaging structure utilizes asymmetric geometry where engaging protrusions extend radially outward from the stator's outer circumferential side surface, while corresponding engaging recesses are formed in the housing's inner circumferential side surface. This asymmetric interlocking design allows the stator to be precisely positioned and restricted from rotating in the circumferential direction, achieving high alignment precision without requiring complex additional components.
Data Source
AI summary
A valve device includes a housing, a stator disposed in the housing and defining at least one passage hole, a driving portion, a shaft configured to be rotated by a rotational force generated by the driving portion, and a rotor in contact with the stator and configured to adjust an amount of the fluid flowing through the at least one passage hole by rotating about an axis along with the shaft. One of an inner circumferential side surface of the housing or an outer circumferential side surface of the stator has at least one engaging protrusion and the other has at least one engaging recess. The at least one engaging protrusion is engaged with the at least one engaging recess such that the stator is restricted from rotating in a circumferential direction of the axis.