Micro-valve Guide Area Design for Wear Reduction
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Solution Overview
Problem
Microvalves experience wear and sticking issues due to rapid switching and the use of high-viscosity or chemically aggressive media, leading to reduced precision and durability in dosing operations.
Innovation Solution
A microvalve design featuring a valve seat with distinct guide, sealing, and outlet areas, utilizing hard materials like sapphire and ruby for the valve ball and seat, with a precise spherical sealing area and a guide area with a steep gradient to minimize wear, along with a cone-shaped outlet area for improved flow and reduced sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hard materials like sapphire and ruby are used for valve seat and valve ball, then wear resistance is improved, but the ball can still hit channel walls and piezo stack uncontrolled causing considerable wear
Solution Approach 1:
The valve seat is divided into functionally distinct zones: a guide area with a steep gradient that directs ball movement, a sealing area for tight closure, and an outlet area for media flow. This segmentation controls the ball's path to prevent uncontrolled impacts while maintaining wear resistance through hard materials in each zone
Solution Approach 2:
Different areas of the valve seat are given different geometric properties: the guide area has a steep gradient to direct the ball, while the sealing area has precise spherical geometry for tight sealing. This local differentiation optimizes each zone's function while controlling ball movement to reduce wear
2Productivity
If rapid switching is performed for high-frequency operation, then productivity is improved, but wear and sticking occur reducing precision and durability
Solution Approach 1:
The valve seat is divided into functionally distinct zones: a guide area with a steep gradient to direct ball movement during rapid switching, a sealing area for tight closure to maintain dosing precision, and an outlet area for media flow. This segmentation allows high-frequency operation while controlling wear and preventing sticking
Solution Approach 2:
The guide area employs a steep gradient parameter that actively directs the valve ball during rapid switching cycles, controlling its movement path to prevent uncontrolled impacts. This parameter optimization enables high switching frequencies while maintaining dosing precision and reducing wear
3Ease of manufacture
If valve ball is completely free and unguided, then ease of manufacture is improved, but wear on valve seat and ball is considerable
Solution Approach 1:
The valve seat is divided into functionally distinct zones: a guide area with a steep gradient to direct ball movement, a sealing area for tight closure, and an outlet area for media flow. This segmentation provides guidance to reduce wear while maintaining manufacturing simplicity through integrated design
Solution Approach 2:
The sealing area features a precisely defined spherical zone that matches the valve ball's geometry, enabling effective sealing. The guide area's steep gradient works with this spherical geometry to direct ball movement and reduce uncontrolled impacts, maintaining wear resistance
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
The design achieves increased wear resistance, precise dosing, and extended service life, enabling high-frequency switching with accurate and reproducible dosing quantities for various media types, including viscous and chemically aggressive substances.
Implementation Method 1
The valve ball is held in an armature, which, driven by a spiral spring, presses the ball into the valve seat
Implementation Method 2
The armature is movably mounted in a bobbin with its end facing away from the ball and can be pulled into the bobbin to open the valve by connecting a circuit to the coil
Data Source
Figure 1~2
Figure 3a~3b
Figure 3c~3d
AI summary
The invention relates to a micro-valve (1) comprising a valve ball (2), a valve seat (3) and a nozzle (14). In said valve, the valve seat (3) comprises a sealing region (5) and an outlet region (6) and guide means (40) are provided on the valve seat. The guide element is configured in the valve seat (3) in the form of a guide region (4) or a one-piece guide element (40) located in the vicinity of the valve seat (3). The micro-valves according to the invention exhibit substantial improvements with respect to dynamics, life cycle and stream pattern. In first embodiments, increased wear-resistance is achieved by the integration of guide means, in the form of a guide region (4), into the valve seat, optimising the dimensions of the transition angle, guide angle and discharge angle. In versions comprising a one-piece guide element (40), wear is reduced by the fact that the ball primarily carries out a sealing function and a guide function to a lesser degree.