Rotary Valve Housing Geometry for Coolant Debris Discharge
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Solution Overview
Problem
In typical valve devices, the constant distance between the outer circumferential wall and the inner wall of the housing leads to difficulties in discharging foreign matter from the coolant water, causing potential malfunctions and increased load torque and pressure drop resistance.
Innovation Solution
The valve device features a housing inner wall with varying distances along the circumferential direction, allowing foreign substances to move to larger gaps during rotation, facilitating their discharge and preventing operational failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the distance between the outer circumferential wall and the inner wall of the housing is kept constant, then the structural simplicity is improved, but the discharge of foreign matter from the coolant water becomes difficult
Solution Approach 1:
The housing inner wall is designed with non-uniform thickness, creating local variations in gap width between the valve outer circumferential wall and housing inner wall. The gap width varies in the circumferential direction, with some regions having larger gaps that facilitate foreign matter discharge while other regions maintain adequate sealing, thus resolving the contradiction between structural simplicity and foreign matter discharge capability
2Reliability
If the gap between the valve outer circumferential wall and housing inner wall is increased to facilitate foreign matter discharge, then the discharge efficiency is improved, but the load torque and pressure drop resistance increase
Solution Approach 1:
The housing is designed with circumferentially varying wall thickness that creates localized larger gaps only in specific regions where foreign matter discharge is needed, rather than uniformly increasing the gap throughout. This allows foreign matter to be discharged through the larger local gaps while maintaining smaller gaps in other regions to minimize overall load torque and pressure drop resistance
Solution Approach 2:
The gap between the valve outer circumferential wall and housing inner wall is made asymmetric in the circumferential direction, with intentionally designed non-uniform distribution of gap widths. This asymmetric design provides preferential discharge paths for foreign matter while maintaining efficient fluid flow characteristics, thereby reducing the impact on load torque compared to a symmetric uniform gap design
Data Source
AI summary
A housing has a housing main body and an outlet port. The housing main body includes a cylindrical housing inner wall that defines an internal space therein. The outlet port fluidly connects the internal space and an outside of the housing main body to each other. The valve has a valve body rotatable about an rotation axis along a rotation axis of the cylindrical housing inner wall. The valve is configured to selectively open and close the outlet port depending on a rotation position of the valve. The housing inner wall is formed such that a distance between the housing inner wall and the axis of the housing inner wall varies in a circumferential direction.