Synchro-Self-Shifting Clutch Low-Speed Synchronization Above Critical Speed
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Solution Overview
Problem
The existing low speed synchronization methods for synchro-self-shifting clutches with a low speed protection function risk damage when the rotational speeds of the input and output ends coincide within the critical rotational speed interval, limiting their application and flexibility, especially in gas-steam uniaxial combined cycle units.
Innovation Solution
A low speed synchronization method that sets a synchronization target speed above the upper limit of the critical rotational speed interval and controls the acceleration of the input end to ensure it surpasses the output end's speed before tripping occurs, preventing coincident rotational speeds within the critical interval and thus avoiding clutch damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the synchronous target speed is set close to the critical rotational speed interval to improve low-speed synchronization capability, then the flexibility and applicability of the clutch is improved, but the risk of damage to the synchro-self-shifting clutch increases due to possible speed coincidence within the critical interval
Solution Approach 1:
The patent applies preliminary action by controlling the acceleration process of the input end before synchronization occurs. The control method monitors rotational speeds and adjusts acceleration in advance to prevent the dangerous speed coincidence condition from occurring, rather than reacting after the problem arises. This is implemented through the control device that adjusts the acceleration of the input end based on real-time speed monitoring.
Solution Approach 2:
The patent implements feedback by continuously monitoring the rotational speeds of both the input end and output end, and using this information to adjust the acceleration process. The control device receives feedback on the current speeds and modifies the acceleration of the input end accordingly to ensure speeds do not coincide within the critical interval. This closed-loop control enables safe low-speed synchronization.
2Reliability
If the synchronous target speed is set much higher than the upper limit of the critical rotational speed interval to avoid damage, then the reliability and safety of the clutch is improved, but the application flexibility is greatly limited
Solution Approach 1:
The patent applies dynamics by making the acceleration process adjustable and controllable rather than fixed. The control device dynamically adjusts the acceleration of the input end based on real-time speed feedback, enabling the system to adaptively navigate through the critical rotational speed interval safely. This dynamic control allows low-speed synchronization while maintaining safety.
Solution Approach 2:
The patent implements parameter changes by modifying the acceleration rate and synchronization target speed as controllable parameters. By adjusting these parameters based on the operational context and critical speed interval characteristics, the system can achieve safe low-speed synchronization. The control device changes acceleration parameters dynamically to prevent dangerous speed coincidence.
3Speed
If the acceleration of the input end is increased to ensure it surpasses the output end's speed before tripping occurs, then the synchronization speed can be reduced, but the control complexity increases
Solution Approach 1:
The patent applies self-service by enabling the control system to automatically monitor and adjust the acceleration process without external intervention. The control device independently monitors rotational speeds, determines when the critical condition might occur, and adjusts acceleration accordingly. This self-regulating capability reduces the need for complex external control mechanisms.
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 method effectively prevents clutch damage during low-speed synchronization by ensuring the input end's rotational speed exceeds the output end's within the critical interval, enhancing the flexibility and safety of synchro-self-shifting clutches, particularly in gas-steam uniaxial combined cycle units.
Implementation Method 1
when the pawl has centrifugal force more than centrifugal force of its tail as with increasing of the rotational speed of the input end and increasing in the centrifugal force, the pawl can fly under the action of centrifugal force and can be coupled with a ratchet
Data Source
Figure 1~3
Figure 4~5
AI summary
A low speed synchronization method for a synchro-self-shifting clutch having a low speed protection function. The method comprises: determining that the critical speed interval of the clutch is n1-n2 r/min, and setting the synchronization target rotational speed as M r/min, wherein M>n2; first increasing the rotational speed of an output end to M r/min and keeping the rotational speed at M r/min, and then increasing the rotational speed of an input end; in the case that the rotational speed of the input end is increased to n r/min, and tripping occurs at the output end when n1<n<n2, speeding up the increase of the rotational speed of the input end, and controlling the time needed for increasing the rotational speed of the input end from n r/min to n2 r/min to be less than the time needed for reducing the rotational speed of the output end from M r/min to n2 r/min, so that the rotational speeds of the input end and the output end coincide with each other when the rotational speeds are greater than n2 r/min.