Vacuum Switch Spring Accumulator Drive
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Solution Overview
Problem
Vacuum switches for railway operations face challenges with pneumatic drives, including complexity, maintenance intensity, and temperature sensitivity, as well as issues with compressed air supply at low temperatures, leading to reliability concerns.
Innovation Solution
A drive system with a pivoted locking bolt and a spring accumulator, coupled with an electric motor drive, allows for preloading and locking of the main spring, enabling efficient switching contact operation independent of compressed air, with a fail-safe mechanism using an electro-retaining magnet for reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a pneumatic drive is used to operate the switching contacts, then the switching contacts can be closed with sufficient force, but the system becomes complex, maintenance-intensive, and sensitive to temperature changes
Solution Approach 1:
The patent extracts the pneumatic system from the drive mechanism and replaces it with a spring accumulator system. The closing force is generated by a main spring that is pre-tensioned and stored in the spring accumulator, eliminating the need for compressors, air tanks, and pneumatic piping while maintaining sufficient closing force for the switching contacts.
Solution Approach 2:
The spring accumulator pre-stores the closing force by pre-tensioning the main spring during normal operation. This preliminary action ensures that when switching is required, the force is already available and can be applied immediately without requiring complex pneumatic systems to generate force on demand.
2Productivity
If a pneumatic drive system is used, then switching can be achieved, but the system requires extensive maintenance and is prone to problems at low temperatures
Solution Approach 1:
The patent replaces the pneumatic mechanical system with a purely mechanical spring accumulator system. The spring-based mechanism has no moving seals, valves, or pneumatic components that are sensitive to temperature changes, thereby eliminating the reliability problems associated with pneumatic systems in cold conditions while maintaining full switching operation capability.
3Productivity
If compressed air is used for switching, then the switching contacts can be operated, but the compressed air system requires a lot of space for water separators and dust collectors
Solution Approach 1:
The patent removes the entire compressed air system including water separators, dust collectors, compressors, and storage tanks from the installation. The spring accumulator system requires no such auxiliary equipment, dramatically reducing the space requirements while maintaining the ability to operate switching contacts reliably.
4Duration of action of stationary object
If the vacuum switch is idle for a long period, then it remains stationary, but the compressed air pressure drops so much that switching can no longer be achieved
Solution Approach 1:
The spring accumulator continuously maintains the main spring in a pre-tensioned state during idle periods, ensuring that the closing force is always ready. This preliminary action eliminates the problem of pressure loss over time that plagues pneumatic systems, allowing the vacuum switch to be immediately operational after any idle period without requiring repressurization.
5Area of stationary object
If a spring accumulator drive system is used, then the system becomes independent of compressed air and requires minimal space, but a locking mechanism is needed to hold the preloaded spring
Solution Approach 1:
The patent employs a dynamic locking mechanism that transitions between locked and unlocked states based on operational requirements. The locking mechanism holds the preloaded spring in a compact configuration during normal operation, then releases it when switching is required, allowing the system to maintain both compactness and functionality without excessive complexity.
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 provides a temperature-resistant, low-maintenance vacuum switch that requires minimal energy for switching, ensuring reliable operation even after extended periods of inactivity and maintaining safe switching dynamics.
Implementation Method 1
a main spring (6) which can transfer the switching rod (5) from an open position into a switching position, the main spring (6) being capable of being preloaded during operation and of being locked in the preloaded state
Implementation Method 2
the latch (19) has an electro-retaining magnet (20) for locking the latch (19) in the pivoted locking position and for unlocking the latch (19) in the pivoted-unlocking position
Implementation Method 3
a cam disc which comes into operative connection with a switching rod (5) or a switching lever (13) actuated by the closing spring
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The vacuum switch (1) has two switch contacts and an drive system (3) with a switch rod (5) moving a switch contact. The drive system has a main spring (6) carrying the switch rod form an open position into a switching position, and a drive that is an electric motor drive, for clamping the main spring. A lock mechanism (11) for locking the main spring in clamping position and a halting latch supported in pivoted manner. The switch rod is released in a pivoted locking position of the halting latch by pivoting the halting latch for carrying the switching position into the open position. An independent claim is also included for a method for switching the switching contacts of a vacuum switch, involves positioning the switch rod into the switching position.