Pneumatic Elevator Pressure Regulator for Controlled Shaft Airflow
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Solution Overview
Problem
Pneumatic elevators face challenges in controlling airflow and pressure within the elevator shaft, leading to unsafe and inefficient cabin movement during gravity descent, due to unregulated pressure above and below the cabin.
Innovation Solution
A pressure regulator system is introduced, comprising a fluid transfer chamber with apertures, a flow control element movable within the chamber, and an actuator to control fluid flow through the apertures, allowing for precise regulation of airflow and pressure within the shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If vent holes are provided to allow air to enter and exit the shaft, then the cabin can move within the shaft, but the air flow becomes uncontrolled leading to poorly controlled movement and possible overpressure damage
Solution Approach 1:
The patent applies parameter changes by using a pressure regulator to dynamically adjust the flow coefficient ( Cv ) based on pressure differential measurements. The regulator changes the opening position of the control valve to modulate air flow, transforming the system from fixed vent holes to a dynamically adjustable pressure control mechanism that maintains reliable operation while enabling smooth cabin movement.
Solution Approach 2:
The patent implements feedback control by measuring the pressure differential across the cabin and using this information to adjust the air flow through the pressure regulator. The controller continuously monitors pressure conditions and modifies the valve opening accordingly, creating a closed-loop system that ensures both safe cabin movement and reliable pressure control.
2Speed
If pressure is increased or decreased to control cabin descent speed, then controlled movement is achieved, but dangerous or equipment damaging high pressures can occur within the shaft
Solution Approach 1:
The patent applies beforehand cushioning by implementing a pressure regulator that proactively controls air flow to prevent dangerous pressure buildup before it occurs. The system monitors pressure conditions and adjusts the control valve in advance to maintain pressure within safe limits, cushioning against potential overpressure damage while enabling controlled cabin descent.
Solution Approach 2:
The patent uses parameter changes by dynamically adjusting the flow coefficient based on real-time pressure differential measurements. The controller modifies the valve opening position to optimize air flow rates, allowing controlled cabin descent speed while preventing harmful overpressure conditions through continuous parameter adjustment.
3Reliability
If a sealed shaft is used for pneumatic elevator operation, then vacuum lift function is achieved, but air/fluid conduits and vent holes are needed creating complex pressure control requirements
Solution Approach 1:
The patent applies universality by designing a pressure regulator that serves multiple functions: controlling air flow during both ascent and descent, maintaining pressure differentials for vacuum lift operation, and preventing overpressure conditions. This single multi-functional device simplifies the overall air flow control system while maintaining reliable vacuum lift function.
Solution Approach 2:
The patent uses parameter changes to manage the complexity of the sealed shaft system. The pressure regulator dynamically adjusts the flow coefficient based on pressure differential measurements, allowing the system to adapt to different operational phases (ascent, descent, hovering) without requiring separate control mechanisms 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 pressure regulator system enables safe, efficient, and controlled movement of the cabin within the shaft by regulating airflow and pressure, preventing overpressure and ensuring reliable operation.
Implementation Method 1
a pneumatic elevator uses a suction mechanism such as a vacuum source to lift a passenger cabin vertically within a substantially sealed shaft... the system needs a mechanism for controlling pressure both above and below the cabin
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
A pressure regulator includes a fluid transfer chamber defining one or more apertures. A flow control element is disposed within the fluid transfer chamber and is movable with respect to the fluid transfer chamber. An actuator is secured to the flow control element and is operable to move the flow control element with respect to the fluid transfer chamber to control fluid flow through the apertures in the fluid transfer chamber.