Rotor Valve Partition Geometry for Leakage and Pressure Loss
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Solution Overview
Problem
Existing valve devices in fluid circulation systems face issues with fluid leakage due to variations in the stop position of the rotor, leading to unintended flow into closed flow holes, and increasing the passage cross-sectional area to prevent leakage results in increased pressure loss.
Innovation Solution
The valve device incorporates a housing with a flow hole forming portion featuring parallel and progressively varying partitions, allowing the rotor to communicate with intended flow holes while maintaining a large passage cross-sectional area by aligning radial sections of the rotor's passage opening with the varying partitions, thereby improving sealing without significant pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the passage cross-sectional area is increased to prevent fluid leakage, then the sealing performance is improved, but the pressure loss increases
Solution Approach 1:
The partition is designed with non-uniform thickness, featuring a first thickness in the radial direction and a second thickness in the axial direction. This local variation in geometry allows the partition to provide effective sealing at the interface between the rotor and flow hole forming portion while maintaining adequate passage cross-sectional area for fluid flow, thereby preventing leakage without causing excessive pressure loss.
Solution Approach 2:
The partition utilizes three-dimensional geometry with different thickness dimensions (radial and axial) to solve the sealing problem. By extending the partition in both radial and axial directions with different thicknesses, the invention creates a sealing structure that effectively blocks fluid leakage paths while preserving sufficient flow area, thus resolving the contradiction between sealing performance and pressure loss.
2Reliability
If the rotor stop position varies, then the fluid may leak into unintended flow holes, but increasing the passage area to prevent leakage causes pressure loss
Solution Approach 1:
The partition's non-uniform thickness distribution (first thickness radially, second thickness axially) creates enhanced sealing at critical interfaces where rotor position variation could cause leakage. This localized geometric optimization ensures reliable flow control accuracy while maintaining adequate passage area to minimize pressure loss.
Solution Approach 2:
The partition structure is designed in advance with specific thickness characteristics to compensate for potential rotor stop position variations. By pre-configuring the partition geometry with different radial and axial thicknesses, the invention creates a tolerance buffer that prevents fluid leakage into unintended flow holes even when rotor positioning varies, without requiring excessive passage area expansion.
Data Source
AI summary
A valve device includes a housing, a flow hole forming portion and a rotor. The housing has a passage for fluid. The flow hole forming portion is fixed at the passage and includes: a plurality of flow holes, each of which is configured to conduct the fluid; and at least one partition which is placed between corresponding adjacent two of the flow holes. The rotor includes a passage opening and a closing portion. The at least one partition of the flow hole forming portion has: a parallel portion which extends in parallel with a radial direction of an imaginary circle centered on a rotational axis; and a progressively varying portion which is placed on an outer side of the parallel portion in the radial direction. A width of the progressively varying portion measured in a circumferential direction is progressively increased toward the outer side in the radial direction.