Elevator Tension Member Jacket Temperature Control
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Solution Overview
Problem
Coated elevator tension members, such as those with polyurethane jackets, experience durability issues due to cold temperatures, leading to increased bending stresses and potential cracking, necessitating frequent maintenance or replacement.
Innovation Solution
A method and device that control the temperature of the jacket by determining the necessary electrical energy to maintain a desired temperature, using electrically conductive cords within the tension member, and supplying energy based on temperature differences, ambient conditions, and predetermined schedules to prevent degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the jacket material is made compressible to reduce weight and material cost, then weight and material cost are saved, but the jacket becomes less durable under cold temperatures and higher bending stresses
Solution Approach 1:
The patent applies parameter changes by heating the jacket material to change its physical properties. Specifically, the compressible jacket material is heated to increase its flexibility and reduce brittleness, thereby improving its durability under bending stresses while maintaining the weight savings of using compressible material.
Solution Approach 2:
The patent makes the jacket material multi-functional by giving it both structural support and temperature regulation capabilities. The jacket is designed to not only provide mechanical support and weight reduction but also to respond to thermal input, allowing it to adapt its properties based on operating conditions.
2Loss of energy
If cold temperatures are present in the hoistway, then energy savings are achieved, but the jacket material becomes stiff and cracks may form
Solution Approach 1:
The patent applies preliminary anti-action by proactively heating the jacket material before cold temperatures can cause damage. The system monitors temperature conditions and applies heat in advance to prevent the jacket from becoming too stiff and developing cracks, countering the harmful effect of cold temperatures before they manifest as damage.
Solution Approach 2:
The system performs preliminary action by pre-heating the jacket material during periods when cold temperatures are anticipated. This allows the jacket to maintain optimal flexibility and durability before being subjected to bending stresses in cold conditions, preventing crack formation.
3Reliability
If electrical heating is applied to maintain jacket temperature, then the durability and flexibility of the jacket are improved, but additional energy consumption is required
Solution Approach 1:
The patent applies periodic action by heating the jacket material in cycles rather than continuously. The system monitors temperature conditions and applies heating only when and where needed, such as during periods of cold temperatures or when bending stresses are anticipated, thereby improving durability while minimizing energy consumption.
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 controlled temperature maintains the flexibility of the jacket material, reducing the likelihood of cracking and extending the lifespan of the tension member by ensuring it operates within optimal conditions.
Implementation Method 1
supplying the determined amount of electrical energy to the electrically conductive cord
Data Source
AI summary
An illustrative example embodiment of a method provides control over a temperature of a jacket on an elevator tension member that includes at least one electrically conductive cord that is at least partially covered by the jacket. The method includes determining an amount of electrical energy needed to achieve a desired temperature of the jacket and supplying the determined amount of electrical energy to the electrically conductive cord.