Streaming Potential Measurement Device with Dual Vacuum Vessels
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Solution Overview
Problem
Existing devices for measuring the streaming potential of fibers and particles in suspensions require large and powerful vacuum pumps, making them cumbersome and costly, with saw-tooth pressure curves complicating accurate zeta-potential computation.
Innovation Solution
A device with two vacuum vessels, each set to a constant reduced pressure, connected alternately to a measurement cell via valves, using a small-capacity vacuum pump and pressure sensors to generate a nearly square pressure curve, facilitating signal processing and reducing the need for cross-correlation computation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large and powerful vacuum pump is used to measure streaming potential, then the measurement can be performed, but the device becomes cumbersome and costly
Solution Approach 1:
The patent divides the single vacuum pump system into two separate vacuum vessels (vessel 1 and vessel 2), each capable of operating independently at different vacuum levels. This segmentation allows the system to achieve reliable measurements while using smaller, more portable vacuum sources compared to a single large powerful pump.
Solution Approach 2:
The patent implements periodic switching between two vacuum vessels to generate an alternating vacuum signal. The valve system alternately connects vessel 1 and vessel 2 to the measurement cell, creating a periodic pressure variation that induces streaming potential without requiring a continuously operating large vacuum pump.
2Reliability
If a large and powerful vacuum pump is used, then the measurement can be performed, but costs increase
Solution Approach 1:
By segmenting the vacuum system into two separate vessels that can operate at lower individual vacuum levels, the patent reduces the cost of each vacuum source. The cumulative effect of two moderate-vacuum vessels replaces the need for one expensive high-vacuum pump.
Solution Approach 2:
The patent introduces a valve system as an intermediary component that controls the connection between vacuum vessels and the measurement cell. This intermediary allows simple, inexpensive vacuum sources to be effectively combined to achieve the required measurement function.
3Device complexity
If a single vacuum pump is used, then the system is simple, but the pressure curve is saw-tooth shaped complicating zeta-potential computation
Solution Approach 1:
The periodic switching between two vacuum vessels generates a more favorable pressure curve shape compared to the saw-tooth pattern from a single pump. This periodic action creates distinct constant-pressure phases that simplify signal processing and zeta-potential calculation.
Solution Approach 2:
Each vacuum vessel is pre-conditioned to maintain a stable vacuum level before being connected to the measurement cell. This preliminary stabilization of pressure in each vessel ensures that when connected, the pressure curve has a flat plateau region, facilitating more accurate measurements.
4Measurement precision
If vacuum vessels are alternatingly connected to generate a square pressure curve, then signal processing is facilitated, but device complexity increases
Solution Approach 1:
The patent segments the vacuum control into two independent vessels with their own valve controls. While this increases component count, each segment remains simple and modular, allowing the complexity to be managed through standardization and independent operation of each vessel-valve pair.
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 improves portability, reduces costs, and enhances measurement accuracy by allowing quick pressure adaptation and averaging over constant signal portions, shortening measurement times and reducing noise interference.
Implementation Method 1
at least one vacuum pump (1) integrated in the measurement device, which produces under the control of pressure sensors (20; 21) and valves (2-7) a different but constant reduced pressure in two vacuum vessels (4; 5)
Implementation Method 2
By switching one of the two vacuum vessels (4; 5) to the measurement cell (8), a periodic pressure curve is generated at the fiber plug (14)
Implementation Method 3
a periodic streaming potential can be measured with two electrodes (15; 16) made, for example, of stainless steel at the fiber plug (14)
Data Source
AI summary
A device for measuring the streaming potential of fibers and particles in suspensions, in particular a device for determining the zeta-potential of the particles of aqueous suspensions containing fibers and particles, by measuring the streaming potential, and by subsequently computing the zeta-potential with an empirical formula. A periodic pressure curve is generated by arranging in the device for measuring the streaming potential at least two vacuum vessels, with each vessel having a different constant reduced pressure. The vacuum vessels are permanently set to a different vacuum and alternatingly connected via a valve to the measurement cell with the fiber plug. The required reduced pressure in the two vacuum vessels is maintained by using at least one small, low-capacity vacuum pump and a valve controller.