The coupling is a component of the pump unit that interconnects the pump shaft and the prime mover shaft and transmits power. Whether the coupling selection is appropriate is related to the efficiency, safety and stable operation of the crude oil pump unit. There are many types of couplings. Pump couplings generally use flexible couplings. The purpose is to transmit power, compensate the relative displacement of the pump shaft and the motor shaft, reduce the precise alignment requirements for the coupling installation, mitigate the impact, and change The natural frequency of the shafting and avoiding harmful vibrations. The flexible coupling types commonly used in pumps include claw-type elastic couplings, elastic pin couplings, and diaphragm couplings.
The claw-type elastic coupling is characterized by small size, light weight, simple structure, convenient installation and low price. Often used in low power and less important occasions. The elastic pin coupling is a pin made of a plurality of non-metallic elastic materials, placed in the flange holes of the two coupling halves, and the coupling of the two halves is realized by the pin. The coupling is simple in structure and installed. Convenient, easy to replace, small size, light weight, suitable for medium speed drive shafting, not suitable for working conditions with high reliability. The diaphragm coupling is formed into various shapes by using a plurality of thin metal diaphragms, and is respectively coupled to the two coupling halves on the main driven shaft by bolts. The diaphragm coupling relies on the elastic deformation of the diaphragm to compensate the relative displacement of the two shafts. It is a high-performance flexible coupling for metal elastic components. It requires no lubrication and maintenance, compact structure, high strength, high temperature resistance and resistance. The misalignment performance is good, the reliability is high, the transmission torque is large, and it is suitable for shafting transmission with high temperature, high speed and corrosive medium working conditions.
Due to the high power of the crude oil conveying centrifugal pump, the working conditions during use and the structural requirements of the pump and the convenience of installation and maintenance, the diaphragm coupling with extended section is used to ensure the disassembly of the coupling and bearing components. , mechanical seals and other parts do not need to disassemble the motor. The housing of the coupling is made of non-sparking stainless steel to ensure safe and reliable use.
