Precision Dispense Valve Constant Speed Rotation
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Solution Overview
Problem
Existing valve assemblies face challenges in achieving precise and repeatable dispensing of small fluid amounts, particularly with viscous fluids, due to variables like valve opening time, orifice diameters, fluid viscosity, and pressure fluctuations.
Innovation Solution
A valve assembly with a brushless motor-driven stem that rotates at constant speed during the opening cycle, featuring a smooth, linear fluid path with double-seal design and precise machining of the valve body, and a fluid reservoir with temperature and pressure control to maintain consistent fluid conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the valve opening time is reduced to dispense very small amounts of fluid, then the dispensed fluid amount decreases, but the precision of dispensing becomes critical and difficult to control
Solution Approach 1:
The patent changes the operational parameters of the valve by implementing constant speed rotation during the opening cycle rather than variable speed operation. This parameter change allows precise control of very small fluid amounts without compromising dispensing precision, as the constant speed eliminates the variability introduced by acceleration and deceleration phases.
2Quantity of substance
If the orifice diameters are made very small to dispense small amounts of fluid, then the dispensed fluid amount decreases, but the machining precision requirement increases significantly
Solution Approach 1:
The patent changes the operational parameters by implementing constant speed rotation during the opening cycle. This allows the use of larger, more easily machined orifices while still achieving precise dispensing of small fluid amounts, thereby reducing the stringent machining precision requirements.
3Quantity of substance
If the fluid viscosity is high (viscous fluid), then the fluid flow capability decreases, but the precision of dispensing becomes more difficult to maintain
Solution Approach 1:
The patent changes the operational parameters by maintaining constant speed rotation during the opening cycle. This provides predictable and consistent flow characteristics for viscous fluids, enabling precise dispensing despite the reduced fluid flow capability inherent to high viscosity.
4Speed
If the fluid pressure is not constant, then the fluid flow speed varies, but the dispensed fluid amount becomes variable and imprecise
Solution Approach 1:
The patent changes the operational parameters by implementing constant speed rotation during the opening cycle. This creates a more stable and predictable fluid flow condition, reducing the variability in dispensed fluid amount even when pressure fluctuations occur.
5Ease of manufacture
If a simple valve construction is used, then the manufacturing cost decreases, but the ability to achieve precise and repeatable dispensing is compromised
Solution Approach 1:
The patent changes the operational parameters by implementing constant speed rotation during the opening cycle. This allows a relatively simple valve construction to achieve precise and repeatable dispensing, as the precision is obtained through controlled operation rather than complex mechanical design.
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
Ensures precise and repeatable dispensing of small fluid amounts by controlling the opening time and eliminating turbulence, while maintaining low costs through simple construction and effective sealing.
Implementation Method 1
A valve assembly with a brushless motor-driven stem that rotates at constant speed during the opening cycle
Implementation Method 2
featuring a smooth, linear fluid path with double-seal design
Implementation Method 3
a fluid reservoir with temperature and pressure control to maintain consistent fluid conditions
Implementation Method 4
a fluid reservoir with temperature and pressure control to maintain consistent fluid conditions
Data Source
AI summary
A fluid dosing valve assembly for dispensing a volumetric amount of a fluid in precise and repeatable amounts, particularly for dosing small amounts. The fluid dosing valve assembly includes a valve body with a fluid path, and a stem element for opening and closing the fluid path by rotation, the rotation being performed from a first closing position to an opening position and from the opening position to a second closing position, with rotation angles between the first closing position and the opening position and between the opening position and the second closing position that allow the opening cycle to be performed at constant rotational speed.