Plane Scroll Spring Torque Distribution for Curtain Driving
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Solution Overview
Problem
Traditional plane scroll springs in curtain driving devices provide torque that does not match the varying weight requirements of the curtain body as it is lifted or lowered, leading to uneven torque distribution and smoothness issues during the lifting or falling process.
Innovation Solution
A plane scroll spring with a working section divided into two length sections, where the torque decreases by different decrement values per unit length from the outer ring to the inner ring, allowing for a more tailored torque distribution that matches the changing weight requirements of the curtain body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the forming radius of curvature of the reed is gradually increased from inner ring toward outer ring, then the torque provided by the plane scroll spring is gradually reduced from inner ring toward outer ring, but this torque distribution does not match the weight requirements of the curtain driving device
Solution Approach 1:
The reed is divided into multiple sections along its length, with each section having a different rate of curvature increase. This segmentation allows the torque to be distributed in a non-uniform manner that can be optimized to match the varying weight requirements at different positions of the curtain driving device.
Solution Approach 2:
Different sections of the reed are designed with different local properties (different curvature increase rates) to provide varying torque characteristics. The inner sections have a higher rate of curvature increase for when the device is lighter, while outer sections have a lower rate for when the device is heavier, creating locally optimized torque distribution.
2Adaptability or versatility
If the torque provided by the plane scroll spring is gradually reduced from outer ring toward inner ring, then the torque distribution matches the weight change of the curtain driving device, but the torque change rate is constant while the weight change rate is not constant
Solution Approach 1:
The curvature increase rate of the reed is made dynamic rather than static. By varying the rate of curvature increase along the length of the reed, the torque output dynamically adapts to the changing weight conditions during curtain operation, ensuring smooth acceleration and deceleration phases.
Solution Approach 2:
The geometric parameter (curvature increase rate) of the reed is changed along its length to optimize torque distribution. By adjusting this parameter, the torque output profile is modified to match the non-linear weight change characteristics of the curtain driving device during operation.
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
This tailored torque distribution ensures a smooth and effective supporting force is provided throughout the lifting or falling process, enhancing the stability and smoothness of curtain movement.
Implementation Method 1
the plane scroll spring will drive the reverse rotation of the intermediate shaft under its own elastic force
Data Source
AI summary
An embodiment of the present invention provides a plane scroll spring. A torque provided by a working section of a reed of the plane scroll spring is gradually reduced from an outer ring toward an inner ring of the plane scroll spring. The working section includes a first length section and a second length section connected to an inner end of the first length section. In the first length section, the torque decreases by a first decrement value per unit length from the outer ring toward the inner ring. In the second length section, the torque decreases by a second decrement value per unit length from the outer ring toward the inner ring. The first decrement value is less than the second decrement value.