Flexible Scroll Coupling for Parallel-Misaligned Shaft Synchronization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional co-rotating scroll devices require complex coupling mechanisms, such as metal bellows, belt couplings, or gear-driven designs, which can be cumbersome and require additional motors, lubrication, and increase the overall size and cost of the device.
Innovation Solution
A flexible coupling device featuring a coupling ring with radially extending connecting members, each comprising a flexure arm that elastically moves between two positions, allowing for efficient torque transmission and synchronization of parallel misaligned scroll shafts without the need for additional motors or lubrication, using a design that reduces the number of components and maintains parallel misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coupling mechanisms (metal bellows, belt couplings, gear-driven designs) are used to couple parallel misaligned scroll shafts, then torque transmission and synchronization are achieved, but device complexity, size, and cost increase
Solution Approach 1:
The patent uses flexible membrane bellows as the coupling mechanism between parallel misaligned scroll shafts. The membrane bellows transmit torque while accommodating the parallel misalignment through elastic deformation, eliminating the need for complex metal bellows, belt couplings, or gear-driven designs. This flexible membrane structure reduces device complexity while maintaining reliable torque transmission and synchronization.
Solution Approach 2:
The patent extracts and eliminates unnecessary components from conventional coupling mechanisms. By using a simplified flexible membrane bellows design, it removes the need for additional motors, lubrication systems, and complex mechanical components found in conventional designs, thereby reducing device complexity and maintenance requirements while maintaining functional reliability.
2Reliability
If conventional coupling mechanisms with additional motors and lubrication systems are used, then torque transmission is achieved, but maintenance requirements and cost increase
Solution Approach 1:
The flexible membrane bellows coupling is a self-service mechanism that transmits torque through elastic deformation of the membrane structure itself, without requiring external lubrication systems or additional motors. The membrane material provides inherent friction-based torque transmission, eliminating the need for maintenance-intensive lubrication systems and reducing overall device cost while maintaining reliable torque transmission.
Solution Approach 2:
The patent employs a simple flexible membrane bellows design that can be manufactured at lower cost compared to complex metal bellows or gear-driven systems. The membrane structure, while having a finite life, provides a cost-effective solution that eliminates expensive lubrication systems and complex mechanical components, reducing both manufacturing and maintenance costs.
3Reliability
If conventional coupling mechanisms are used to accommodate parallel misalignment, then shaft synchronization is achieved, but axial dimension and device size increase
Solution Approach 1:
The flexible membrane bellows coupling accommodates parallel misalignment between scroll shafts through the elastic deformation of the thin membrane structure. This allows the coupling to compactly absorb the misalignment in a space-efficient manner, maintaining shaft synchronization without increasing the axial dimension of the device as much as conventional rigid coupling mechanisms would require.
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 enables a compact, maintenance-free, and cost-effective co-rotating scroll device with reduced axial dimension, capable of reliable operation over millions of cycles, suitable for oil-free scroll compressors and expanders, by maintaining synchronization and accommodating parallel misalignment between scroll shafts.
Implementation Method 1
the flexure arm is configured to elastically move between a first flexed position and a second flexed position
Data Source
AI summary
A flexible coupling device for a spinning or co-rotating scroll device and associated systems and methods are provided. The coupling device may be configured to couple a first scroll and a second scroll of a co-rotating scroll device. Further, a first scroll shaft of the first scroll and a second scroll shaft of the second scroll are maintained in parallel misalignment by the coupling device. The coupling device may comprise a coupling ring and a plurality of connecting members extending from the coupling ring. Each connecting member includes a flexure arm configured to elastically move or flex between a first flexed position and a second flexed position which contributes to maintaining the parallel misalignment between the first scroll shaft and the second scroll shaft.