Vacuum Capacitor Drive System Using Plastic Nut
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Solution Overview
Problem
Existing drive systems for variable vacuum capacitors face challenges in achieving high speed and durability for rapid capacitance changes, despite advancements in materials and lubricants, leading to unsatisfactory operational life and performance.
Innovation Solution
The mechanical drive system incorporates a nut partially or fully made of high-performance plastic material, combined with a stainless steel drive screw and PVD coating, to enhance durability and speed, with the nut's design allowing adaptation to contacting materials and incorporating a lubricant for reduced friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional lead bronze nut and stainless steel drive screw are used, then the drive system can withstand high currents and voltages, but the durability and allowable speed for capacitance change are insufficient
Solution Approach 1:
The patent applies composite materials by combining plastic material with metallic inserts or coatings in the nut structure. The nut comprises a plastic base material reinforced with metallic components, creating a composite structure that leverages the low friction and corrosion resistance of plastic while incorporating the strength and conductivity of metals. This composite approach resolves the contradiction by enabling high-speed operation through reduced friction while maintaining durability through the reinforced structure capable of withstanding high currents and voltages.
Solution Approach 2:
The patent changes the material parameters of the nut from traditional lead bronze to plastic material with specific tribological properties. By selecting plastic materials with optimized friction coefficients, wear resistance, and electrical properties, the system achieves higher allowable rotation speeds while maintaining reliability under high current and voltage conditions. The parameter change in material composition directly addresses both the speed and durability requirements.
2Productivity
If hardening techniques and new lubricants are introduced to increase rotation speed, then capacitance change speed improves, but the operational life and durability do not fully satisfy requirements
Solution Approach 1:
The patent substitutes the traditional metal-to-metal mechanical contact system with a plastic-based contact system. The plastic nut material replaces the lead bronze nut, eliminating the need for hardening techniques and external lubricants. This substitution inherently provides self-lubricating properties through the plastic material's low friction coefficient, enabling high-speed operation while maintaining long operational life without the degradation issues associated with traditional lubrication methods.
3Reliability
If the nut is fully made of plastic material, then durability and speed are significantly improved, but the number of parts increases and manufacturing complexity rises
Solution Approach 1:
The patent merges multiple functions into the plastic nut structure by integrating metallic inserts, coatings, or reinforcement elements directly into the plastic matrix. This combining approach creates a unified composite component that delivers enhanced durability and speed performance while avoiding the need for separate metal nuts and additional assembly steps. The merged structure reduces overall part count and simplifies manufacturing compared to using entirely separate plastic and metal components.
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 significantly improves the drive system's durability and allows for higher speed changes in capacitance, meeting the increased demands for operational life and performance while minimizing parts and optimizing physical properties.
Implementation Method 1
The drive screw may comprise a PVD (PVD: Physical Vapor Deposition) coating, which coating may be manufactured by means of well known methods and procedures.
Implementation Method 2
When the drive screw and the nut are installed, a lubricant may be applied to the drive screw, such that the friction between the drive screw and the nut is reduced further.
Data Source
Figure 1~0002
Figure 3~0003
AI summary
The invention relates to a mechanical drive system for a vacuum capacitor (1), which drive system comprises a drive screw (2) and a nut (3), wherein the nut (3) is arranged in a housing of the vacuum capacitor (1), wherein the drive screw (2) is screwed through the nut (3), wherein a first electrode is arranged on one side of the drive screw (2), wherein, by means of a rotation of the drive screw (2), the first electrode is movable relative to a second electrode, and wherein the nut (3) is at least partially manufactured out of a plastic material.