A diaphragm coupling is a type of high-performance metal flexible coupling. It is also known as a flexible diaphragm coupling.

Structure and Principle

A diaphragm coupling consists of several groups of diaphragms (made of stainless steel thin plates) that are alternately connected to the two halves of the coupling by bolts. Each group of diaphragms is composed of several stacked pieces. When the coupling is in operation, it transmits torque from the outer diameter of the flexible plate to the inner diameter, across the spool or spacer piece, and then from the inner diameter to the outer diameter. It compensates for axial and angular displacements through the elastic deformation of the diaphragms while transferring torque.

Characteristics

Compact structure: It has a relatively simple structure, does not require lubrication, and is easy to install, disassemble, and inspect. When disassembling, the main and driven parts of the transmission system do not need to be axially displaced to be disengaged.

High strength and long service life: It has a high load-bearing capacity, with a nominal torque transmission range of 25-1000000 N·m, and can be used in various working conditions for a long time.

Good environmental adaptability: It is not affected by temperature and oil pollution, and has the characteristics of acid resistance, alkali resistance, and corrosion resistance. Its working temperature range is -20°C to +250°C.

High - speed performance: It has a small additional force on the equipment, and after dynamic balancing, it is widely used in high - speed transmission shaft systems. It is especially suitable for high - speed and high - power turbine - compressor units that are sensitive to the weight and hanging bending moment of the coupling.

Accurate torque transmission: There is no rotational clearance in the connection of elastic elements, which can ensure accurate torque transmission and is mainly used for the shaft systems with relatively stable loads.