Ionization Gauge Cartridge Structure to Suppress Electrode Deposition
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Solution Overview
Problem
Ionization gauges experience a decrease in discharge inducing performance over time due to substance deposition on the surfaces of the projecting portions, making it difficult to maintain effective discharge.
Innovation Solution
The ionization gauge incorporates a cartridge with a concave-convex structure in the through holes of the pole pieces and anode, which increases the surface area and reduces particle deposition, thereby maintaining discharge performance by preventing film formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a smooth surface is used in the through hole, then the structure is simple and easy to manufacture, but substances are deposited on the surface making discharge difficult to induce over time
Solution Approach 1:
The through hole is designed with projecting portions that create local convex and concave regions. The convex portions (projecting portions) have reduced surface area where substances would deposit, while the concave portions provide spaces where deposited substances accumulate without affecting the discharge inducing function. This local differentiation of surface properties maintains discharge performance over time.
Solution Approach 2:
The projecting portions are designed with curved surfaces rather than flat surfaces. The convex curved surfaces minimize the area where substances can deposit and adhere, while the concave regions between projecting portions provide collection spaces. The curved geometry reduces the effective surface area exposed to particle deposition compared to a flat surface.
2Reliability
If the surface area of the cathode and anode is increased, then discharge inducing performance is improved, but particle deposition on the surface increases
Solution Approach 1:
The surface is divided into functional zones: convex portions that actively induce discharge with minimized deposition area, and concave portions that serve as collection zones for deposited particles. This local differentiation allows the overall surface area to be increased for better discharge induction while the actual deposition-prone surfaces (convex portions) maintain relatively small area.
Solution Approach 2:
The concave portions between projecting portions serve as traps for deposited particles and substances. By providing dedicated collection zones, the harmful deposition effect is converted into a beneficial feature where particles are collected in controlled locations rather than uniformly covering the discharge-inducing surfaces, thereby maintaining long-term discharge performance.
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 concave-convex structure effectively suppresses the deposition of particles, enhancing the longevity and efficiency of the discharge inducing performance by increasing the surface area and reducing film formation on the cathode and anode surfaces.
Implementation Method 1
a gas is ionized by applying a voltage between an anode and a cathode and thus causing discharge
Implementation Method 2
a gas is ionized by applying a voltage between an anode and a cathode and thus causing discharge
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An ionization gauge includes an anode having a rod shape, and a cathode including a cathode plate having a through hole through which the anode extends. A shape of the through hole on a section along an axial direction of the anode includes a concave portion sandwiched between two convex portions.