Spring-Actuated Overload Valve for Pneumatic Vacuum Elevators
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Solution Overview
Problem
Current pneumatic vacuum elevators rely on load cells for real-time weight detection, which can malfunction, leading to incorrect overload alerts and potential safety hazards, necessitating a reliable automatic overload detection system.
Innovation Solution
An overload valve assembly utilizing a spring actuation mechanism, comprising a fastening means, pad, arresting plate, disc plate, bottom bush, and spring, which ensures the maximum permissible load is not exceeded by disconnecting the power circuit when the load exceeds the limit, thereby halting the elevator operation safely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If load cells are used for real-time weight detection, then weight measurement capability is provided, but reliability deteriorates due to malfunction leading to incorrect overload alerts
Solution Approach 1:
The patent extracts the overload detection function from the electrical load cell system and implements it through a purely mechanical valve assembly. The overload valve unit with spring mechanism is separated from the electrical control system, providing a standalone mechanical verification system that operates independently to detect and respond to overload conditions.
Solution Approach 2:
The patent introduces an intermediary mechanical verification system (overload valve assembly) that acts as a mediator between the load cell electrical system and the final safety response. The valve assembly with its spring mechanism serves as an intermediate layer that can verify or override electrical signals, ensuring that overload detection is not solely dependent on potentially faulty electrical sensors.
2Reliability
If an automatic overload detection system is implemented, then safety is improved by halting operation when load exceeds limit, but device complexity increases with additional valve assembly components
Solution Approach 1:
The patent merges multiple functions into the overload valve assembly: the spring mechanism provides both the detection capability (through compression/expansion) and the actuation function (opening/closing the valve) simultaneously. The valve body integrates the flow control function with the mechanical detection mechanism, eliminating the need for separate detection and actuation components.
Solution Approach 2:
The overload valve assembly serves multiple functions: it detects overload conditions through the spring mechanism, actuates the shutdown by opening or closing the valve, and provides a mechanical verification independent of the electrical system. This multi-functional design reduces the need for additional dedicated components for each function.
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 an automatic and reliable overload detection system that prevents unsafe operations by ensuring the elevator cabin's load does not exceed the permissible limit, enhancing safety and preventing accidents.
Implementation Method 1
a spring of predetermined spring force. The spring is inserted into the fastening means and rests above the disc plate
Data Source
AI summary
An overload valve assembly for a pneumatic vacuum elevator is disclosed. The overload valve assembly for a pneumatic vacuum elevator is characterised by a fastening means, a pad with a centre hole, an arresting plate with a centre hole, a disc plate with a centre hole, a bottom bush, a spring and a top bush bounded with a nut. Here, the pad, the arresting plate, the disc plate, the bottom bush, the spring and the top bush bounded with the nut is fitted over the fastening means. The overload valve unit is configured to function based on spring actuation mechanism and ensure the maximum permissible limit of pay load in the elevator cabin assembly.