Rectangular Solenoid Valve Chamber for Anti-Vacuum Surge Sealing
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Solution Overview
Problem
Existing phacoemulsification systems face challenges in preventing anti-vacuum surges due to the difficulty in achieving a tight seal between the magnetic plunger and the valve cavity, leading to potential leakage and inefficiencies in fluid control.
Innovation Solution
The introduction of a solenoid valve with a magnetic plunger having parallel flattened surfaces, designed to fit within a valve cavity of a rectangular cross-section, which enhances the sealing efficiency and reduces sensitivity to geometric tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic plunger is used in a circular valve cavity, then the valve can be simple in structure, but it is difficult to achieve a tight seal and is sensitive to geometric tolerances
Solution Approach 1:
The patent transforms the traditional circular cross-section of the valve cavity and plunger into a rectangular cross-section. This asymmetric geometric change allows the plunger to maintain parallel flattened surfaces that can achieve tight sealing contact with the rectangular valve cavity walls, thereby improving sealing efficiency while reducing sensitivity to geometric tolerances during assembly.
Solution Approach 2:
The patent introduces curved lateral surfaces on the plunger that correspond to curved lateral walls in the valve cavity. These curved surfaces enable the plunger to rotate within the cavity, providing self-adjusting sealing contact that compensates for manufacturing tolerances and enhances sealing reliability without requiring extremely tight geometric precision.
2Reliability
If the plunger is tightly fitted in the valve cavity to prevent leakage, then sealing improves, but the plunger may rotate unintentionally affecting fluid control
Solution Approach 1:
The rectangular cross-section creates an asymmetric fit between the plunger and valve cavity. This asymmetry, combined with the specific configuration of curved lateral surfaces, prevents rotational movement while maintaining tight sealing contact, thereby ensuring both fluid control reliability and rotational stability.
Solution Approach 2:
The curved lateral surfaces of the plunger are designed to correspond with curved lateral walls of the valve cavity. This curvature allows the plunger to rotate freely when needed for sealing adjustment but prevents unintended rotation during operation by maintaining consistent contact pressure against the cavity walls, thus stabilizing fluid control.
3Reliability
If parallel flattened surfaces are used on the plunger, then sealing efficiency improves, but manufacturing complexity increases
Solution Approach 1:
The rectangular cross-section with parallel flattened surfaces is a geometrically simple form that can be manufactured using standard machining processes. The asymmetry is achieved through basic rectangular shaping rather than complex curved surfaces, making the design easier to manufacture while maintaining effective sealing contact with the rectangular valve cavity.
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 configuration effectively controls fluid connectivity between the inlet and outlet ports, minimizing leakage and ensuring reliable operation in preventing anti-vacuum surges during phacoemulsification procedures.
Implementation Method 1
The solenoid coil is disposed in the valve body around the valve cavity. The plunger comprises a permanent magnet, and is configured to move back-and-forth along the direction of elongation between a first position and a second position in the valve cavity
Implementation Method 2
The controller is configured to apply at least one current to the solenoid coil to selectively move the plunger between the first position and the second position
Data Source
AI summary
An anti-vacuum surge (AVS) cartridge includes a solenoid valve with a magnetic plunger having parallel flattened surfaces, in a valve cavity of a rectangular or other similar cross section. The flattened surfaces of the plunger are oppositely disposed from each other and are in line with the flow path through the aspiration channel of the AVS cartridge.