Conventional design of elastic sleeve pin coupling

　　The coupling is used to connect the turbine rotor and generator rotor to the main oil pump lubrication system and adjustment system, and mainly transmits the rotating torque.Since the coupling rotates at a high speed with the steam turbine rotor, it is subject to great centrifugal force.One end of the original spring-type flexible coupling is fixed by two flange bolts, clamped between the turbine rotor flange and the coupling flange, or between the oil pump main shaft, and has an axial displacement.During operation, due to the deviation between the center of the steam turbine rotor and the center of the coupling, and the slightly uneven expansion of the main shaft or other reasons, a large shear force may be caused by the spring plate. Due to the twisting stress of the spring plate, So it is very easy to break.After the spring leaf is broken, the axial gap is uneven, and the left and right openings have a large deviation. After reaching the design theory level, the flange on the coupling side will be rubbed under the cover for a short time. A longer time will cause the coupling bolts. Fracture, and then twist off.After changing to the gear sleeve type, the main advantages are as follows: a large center deviation is allowed when the rotor expands; a large torque of the steam turbine generator can be transmitted smoothly; the shaft displacement can be well absorbed when the main shaft expands; each tooth The coupling is uniform, and the force between the teeth is more uniform, which reduces the vibration in the transmission.
　　The conventional design of the elastic sleeve pin coupling is to determine its model according to the working requirements (shaft diameter, calculated torque, working speed, etc.), and then check the calculation according to the strength conditions.This conventional design method has two shortcomings: (1) When calculating the strength, the working stress and strength of each part of the coupling are regarded as definite quantities, but in fact, due to the influence of various factors, they are not definite quantities. , Should be described by random variables or fuzzy quantities; (2) The working reliability of the designed coupling cannot be informed during the design.
　　With the rapid development of CAE technology, the traditional conventional design methods of component design have been severely impacted in all aspects. In the field of mechanical component design, the powerful commercial general analysis software ANSYS has injected common mechanical component design analysis and optimization The new blood has opened up a broad space for development.
　　Coupling is a mechanical device that connects a shaft and a shaft or a shaft and a rotating part, and rotates together without disengaging in the process of transmitting torque and movement.It can be divided into rigid coupling, elastic coupling and coupling.
　　The elastic sleeve pin coupling uses a pin with an elastic sleeve (rubber material) on one end, which is installed in the flange hole of the two halves of the coupling to realize the connection of the two halves of the coupling.The elastic sleeve pin coupling used to be a standard coupling in my country. Its structure is relatively simple, easy to manufacture, no lubrication, no need to bond with metal vulcanization, easy to change the elastic sleeve, no need to move the half coupling, with compensation The relative offset of the two axes and the performance of damping and cushioning.The elastic sleeve is compressed and deformed when it works. Because the thickness of the elastic sleeve is thin, the volume is small, and the elastic deformation is limited, the elastic sleeve pin coupling has less allowable compensation for axis displacement and weaker elasticity.It is suitable for small and medium-power shafting transmissions with good rigidity of the installation base, high centering accuracy, low impact load, and low vibration reduction requirements.The elastic sleeve pin coupling with brake wheel, due to the addition of the brake wheel, is more stable during braking, and has good performance in damping and buffering.