Electric Valve Core Diameter Optimization to Reduce Internal Leakage
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Solution Overview
Problem
Existing electric valves face challenges in minimizing internal leakage when closed, which affects their reliability and efficiency.
Innovation Solution
The electric valve design incorporates a valve core with a substantially annular lower section having a uniform outer and inner diameter, along with a sealing assembly that includes a second sealing portion, ensuring a sliding fit with a bushing component and an equalizing flow path to reduce internal leakage by optimizing the diameter relationship between the axial projection circular line, outer diameter, and inner diameter of the lower section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the valve core is designed with a simple structure, then the device complexity is reduced, but the internal leakage when closed increases
Solution Approach 1:
The valve core is segmented into multiple functional sections: an upper section for normal operation, a lower section with uniform outer and inner diameters for sealing, and an equalizing flow path. This segmentation allows each section to perform its specific function optimally while maintaining overall structural simplicity.
Solution Approach 2:
The equalizing flow path acts as an intermediary mechanism that balances fluid pressure between different chambers during valve closure. This intermediary flow path enables the lower section to maintain contact with the sealing ring without requiring complex spring mechanisms or additional actuating components.
2Strength
If the lower section wall thickness is increased, then the structural strength is improved, but the internal leakage increases due to loss of force balance
Solution Approach 1:
The patent optimizes the wall thickness parameter of the lower section to a specific range that maintains both structural strength and force balance. By carefully selecting this parameter, the design achieves adequate strength without excessive thickness that would disrupt the force equilibrium necessary for effective sealing.
Solution Approach 2:
Instead of uniformly thickening the entire valve core, the design applies partial reinforcement only where needed while maintaining the force balance. The lower section has controlled wall thickness sufficient for strength but not excessive, preserving the pressure equilibrium required for sealing contact.
3Reliability
If the sealing contact area is increased, then the sealing performance is improved, but the opening resistance increases
Solution Approach 1:
The sealing contact is concentrated in the lower section with uniform diameter, creating a localized high-quality sealing zone. This localized sealing approach provides effective sealing performance while limiting the total contact area, thereby reducing the force required to open the valve compared to distributed sealing arrangements.
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
This design effectively reduces internal leakage, enhances the reliability of the electric valve's closure, and extends the service life of the sealing ring by maintaining force balance and preventing excessive material stress, while allowing bidirectional fluid flow with improved opening resistance.
Implementation Method 1
the valve core component includes a second sealing portion, the valve core component is in sliding fit with the bushing component through the second sealing portion
Implementation Method 2
the valve core component includes an equalizing flow path, and when the lower section is abutted against the first sealing portion, the first chamber is communicated with a first fluid port of the electric valve through the equalizing flow path
Data Source
AI summary
An electric valve, including a valve body part, a valve seat part, and a valve core part. The valve core part is provided in an inner cavity of the valve body part. The valve core part comprises a valve core. The valve core comprises a lower segment portion. The valve base part comprises a first sealing portion. An end of the lower segment portion can be abutted against or separated from the first sealing portion. The valve body part comprises a bushing part. The valve core part comprises a second sealing portion. The diameter D1 of the axial projection loop of the outer edge of the second sealing portion on the cross section of the lower segment portion, the outer diameter D2 of the lower segment portion, and the inner diameter D3 of the lower segment portion, satisfy: 0.2 mm2≤D1*(D2−D3)≤6 mm2.