Pump assembly

The pump assembly comprises a pump and a coupling mechanism, the pump comprises a pump body and a pump shaft rotatably connected to the pump body, the coupling mechanism comprises a first coupling assembly and a second coupling assembly which are in transmission connection, the first coupling assembly is used for being in transmission connection with an output piece of a driving mechanism, and the second coupling assembly is in transmission connection with the pump shaft. And the driving mechanism drives the pump shaft to rotate through the coupling mechanism. Besides, the coupling mechanism is directly or indirectly supported on the mounting seat in a manner of rotating around the central axis of the pump shaft, so that the pump body bears the coupling mechanism to share redundant load except torque transmitted to the pump shaft by the coupling mechanism, thereby reducing the influence on the pump shaft, improving the use condition of the pump shaft and prolonging the service life of the pump shaft. And the