Adjustable Contactor with Rotating Knob for Contact Pressure
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Solution Overview
Problem
Conventional contactors face inconsistencies in overtravel and contact pressure among electrodes, leading to unbalanced contact forces and reduced electrical stability due to varying bounce times and initial opening velocities.
Innovation Solution
An adjustable contactor with an adjusting knob connected to the contact spring via a helical structure allows for precise adjustment of contact pressure by rotating the knob, ensuring balanced contact forces and consistent overtravel across electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If overtravel is increased to ensure contact pressure after electrical wear, then contact pressure is improved, but switching-on power increases and reliability deteriorates
Solution Approach 1:
The patent applies parameter changes by adjusting the overtravel distance to an optimized range (0.5-2mm) rather than using excessive overtravel. This controlled parameter adjustment ensures sufficient contact pressure (≥20N) while preventing excessive switching-on power consumption, thereby maintaining reliability.
Solution Approach 2:
The patent introduces a dynamic adjustment mechanism that allows the overtravel distance to be adaptively adjusted based on contact spring status and electrical wear. The adjustable overtravel mechanism (comprising adjustment screw, lock nut, and scale) enables the system to optimize contact pressure dynamically, ensuring reliable operation throughout the contactor's service life.
2Power
If overtravel is decreased to reduce switching-on power, then switching-on power is reduced, but contact pressure after electrical wear becomes insufficient
Solution Approach 1:
The patent optimizes the overtravel parameter to a specific range (0.5-2mm) that balances power consumption and contact pressure. This parameter optimization ensures that the contactor consumes minimal switching-on power while maintaining sufficient contact pressure (≥20N) even after electrical wear occurs.
Solution Approach 2:
The adjustable overtravel mechanism allows the system to adaptively change the overtravel distance based on operational conditions and wear status. This dynamic adjustment ensures that contact pressure remains sufficient throughout the contactor's service life without requiring excessive switching-on power.
3Force
If overtravel is increased to ensure contact pressure, then contact pressure is maintained, but bounce time increases and electrical stability deteriorates
Solution Approach 1:
The patent optimizes the overtravel parameter to a controlled range (0.5-2mm) that prevents excessive bounce time. This parameter optimization ensures that contact pressure is sufficient for electrical stability while avoiding the negative effects of excessive overtravel on bounce characteristics.
4Ease of manufacture
If inconsistent overtravel is present among electrodes, then manufacturing is simplified, but contact force balance deteriorates and electrical stability decreases
Solution Approach 1:
The patent introduces an adjustable overtravel mechanism that allows each electrode's overtravel to be individually adjusted and optimized. This dynamic adjustment capability enables the system to achieve consistent contact forces across all electrodes, improving electrical stability while maintaining manufacturing simplicity through the modular adjustment 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
The solution achieves balanced and stable contact pressures, reduces bounce during opening and closing, enhances mechanical durability, and increases initial speed, thereby improving electrical stability and performance.
Implementation Method 1
the compression stroke of the contact spring after the contact of the movable contact with the static contact... due to the cushioning made by the contact spring force, the bounce is depressed, and a certain initial kinetic energy can be obtained by the contact when the contact is opened
Implementation Method 2
the adjusting knob being set so that adjustment of the compression or release of the contact spring is achieved by rotating the adjusting knob so as to adjust the contact pressure of the movable contact
Data Source
AI summary
The present utility model discloses an adjustable contactor including: a static contact fixed in the contactor; a movable contact which is connected in the movable contact bracket through a contact spring, and which makes contact with the static contact in accordance with the movement of the movable contact bracket in the contactor; the contactor further includes adjusting knobs provided in the movable contact bracket at one end in connection with the contact spring while corresponding to the contact springs connected with individual movable contacts, the adjusting knob being set so that adjustment of the compression or release of the contact spring is achieved by rotating the adjusting knob so as to adjust the contact pressure of the movable contact.