Conical Rotary Valve Geometry for Low-Friction Leak Control
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Solution Overview
Problem
Rotary valves in cooling circuits face issues with high frictional forces and wear due to sealing contact, leading to increased wear and potential leakage when the valve core is not properly aligned within the valve housing.
Innovation Solution
A conical-shaped valve core and valve chamber design with a translational and rotational movement mechanism that minimizes contact and friction, allowing for easy assembly and adjustment while preventing leakage, using a selector shaft with detent arrangements for precise positioning and a spring for correct alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the valve core is arranged in the valve housing with a clearance, then the forces required for rotation and wear are reduced, but undesirable leakage can occur via the gap between the valve housing and the valve core
Solution Approach 1:
The valve chamber is designed with a conical shape instead of a cylindrical one, creating a tapered clearance between the valve core and valve housing. This curved geometric configuration allows the clearance to be larger at the inlet where leakage is less critical, while maintaining tighter clearance at the outlet where leakage control is more important, thus reducing rotation forces while preventing undesirable leakage
2Reliability
If sealing contact between the valve core and valve housing is implemented, then leakage is prevented, but high frictional forces and increased wear occur due to required contact pressure
Solution Approach 1:
The conical shape of the valve chamber creates a tapered clearance that eliminates the need for high contact pressure sealing. The gradual reduction in clearance from inlet to outlet provides natural sealing at the critical outlet region while maintaining larger clearance elsewhere, preventing wear without sacrificing leakage prevention
3Manufacturing precision
If the valve core is fully pushed into the valve housing during assembly, then proper alignment is achieved, but components of the valve core may be damaged during assembly due to contact with the chamber wall
Solution Approach 1:
The conical shape provides a gradual taper that guides the valve core into proper alignment as it is pushed into the valve housing. The expanding clearance towards the inlet allows the valve core to be inserted without contacting the chamber wall during assembly, preventing damage while ensuring correct positioning is achieved
Data Source
AI summary
A rotary valve, comprising a valve housing with a valve chamber, wherein the valve chamber has a chamber wall in which at least two fluid openings are provided, wherein the valve chamber has a receiving opening on the end face side, wherein the valve chamber accommodates a valve core, wherein the valve core is provided with a channel structure which interacts with the fluid openings, wherein the valve core is supported in the valve chamber in a rotationally movable manner, wherein the valve chamber is formed in a conical shape.