Centrifugal pump with external mechanical seal

The utility model relates to a centrifugal pump with an external mechanical seal, which comprises a pump body, a pump cover, a pump shaft and a mechanical seal mechanism, the pump body is provided with a support, the support is detachably connected with the pump cover, the support is rotatably connected with the pump shaft through the mechanical seal mechanism, one end of the pump shaft is provided with an impeller, and the other end of the pump shaft is provided with an impeller. The mechanical seal mechanism comprises a mechanical seal static ring, a mechanical seal moving ring, a clamp, a check ring and a spring, the impeller is fixedly connected with the mechanical seal static ring, and the support is connected with the mechanical seal moving ring and the clamp in a sliding mode. The mechanical seal static ring and the mechanical seal moving ring are connected to the impeller and the support respectively, so that the mechanical seal mechanism is externally arranged, namely, the abutting face of the mechan