The middle section and two half shaft joints in the ordinary structure of the diaphragm coupling components are in rigid contact, and vibration is reduced by the elastic deformation generated by the diaphragm during operation. Its vibration reduction effect is poor, resulting in high unit noise. In order to improve the damping capacity of the diaphragm coupling, it is necessary to increase its resistance coefficient, mainly by increasing the ratio of the interference torque frequency to the natural vibration frequency.

As it increases, the power amplification coefficient of the diaphragm coupling decreases, thereby achieving vibration reduction effect. Increase its resistance coefficient, improve its machining degree and dynamic balance level, reduce the impact of the coupling itself on the balance of the unit, and thus achieve the goal of reducing the noise of the screw compressor unit. Utilize the resistance of the buffer ring to the vibration system, reduce the natural frequency of the coupling, and at the same time, the buffer ring also plays a role in isolating vibration.

When passing through the buffer ring, most of the vibration energy is reduced and converted into the deformation potential energy of the buffer ring, resulting in a decrease in vibration performance. The connection plate is positioned in conjunction with the two half shaft joints to ensure coaxiality between the connection plate and the half shaft joints. The elastic deformation of the diaphragm is increased, thereby reducing the vibration of the coupling. The coupling is an intermediate component connecting the electric motor and compressor, and its compatibility with the motor and rotor shaft diameter can also affect the vibration of the unit.

Requirements have been put forward for the machining of compressor coupling and motor coupling, and the inner hole, outer circle, and end face of the coupling must be ground; At the same time as surface roughness, it also meets the requirements of coaxiality and verticality, which improves the fit between the motor coupling and the motor shaft diameter, the compressor coupling and the rotor shaft diameter, and brings convenience for future installation and alignment.