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Double diaphragm coupling has torsional buffering and vibration reduction performance in transmitting torque

The centrifugal stress borne by the diaphragm varies greatly with the rotational speed, but the operating conditions can also be regarded as constant stress. When the dual diaphragm coupling is working, the torque transmitted by the diaphragm components is very high; The main failure of the elastic diaphragm coupling is not caused by the insufficient torque transmission capacity of the diaphragm component, but by the alternating cyclic composite stress on the diaphragm, which is caused by the additional load generated by the misalignment of the two shafts connected by the double diaphragm coupling. The axial displacement of a dual diaphragm coupling is influenced by the size of the coupling and the number of bolts. The larger the coupling size, the greater the axial displacement it can withstand.

Double diaphragm coupling

The impact of bending vibration on the normal operation of the unit is significant in the rotor system. The comparison of critical speeds in the two tables shows that the critical speed of the rotor system coincides with the critical speed of a single span rotor, which is the order critical speed of the entire rotor system. The dual diaphragm coupling can effectively absorb the bending vibration of the rotor system and compensate for the displacement generated by bending by utilizing the elastic deformation of the diaphragm, effectively reducing the impact of bending vibration between different spans. After considering the coupling of bending and torsion, the critical speed of each order of bending vibration in the rotor system did not change significantly.

We can see significant changes in various vibration modes. The double diaphragm coupling has lower torsional elasticity in transmitting torque, and its cushioning and damping performance is worse than bending vibration. The diaphragm is subjected to tensile and compressive stresses during operation, as well as bending stresses and high cycle fatigue stresses generated during three-dimensional displacement compensation. In order to adapt to various working conditions, double diaphragm couplings are generally divided into conventional types, high cycle fatigue resistant types, heat resistant types, and corrosion resistant types. The basic structure of these four models is the same, but the diaphragm material grades are different, in order to achieve economic efficiency and meet different stress conditions.

The purpose of pressure processing is to make products, and at the same time change the internal structure of materials to obtain strong and tough mechanical properties. The method of pressure processing is to develop process parameters. In Hot working, it mainly controls the heating temperature, holding time, deformation, final forging (rolling) temperature. In the cold rolling process, it mainly controls the annealing temperature and the cold deformation of each pass, and the pressure processing process. Double diaphragm couplings are usually installed on high-speed transmission shafts, and the centrifugal inertia force of high-speed machinery is very important. The centrifugal inertia force generated by the mass of bolts, washers, etc. and the centrifugal inertia force generated by the mass of the diaphragm group itself are both radially outward, causing the diaphragm group to experience centrifugal tensile stress.

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