1. Single-stage pumps and multi-stage pump on the distinction between:
Single-stage pump is defined only one impeller pumps, general single-stage pump maximum lift is only 125 meters, has simple structure, stable performance, high speed, small size, light weight, high efficiency, large flow, easy to operation and maintenance advantages.
Multi-stage pump is a simple series of many single-stage pumps, combined together. His output water pressure can be very large. Is a centrifugal pump, but also rely on the rotation of the impeller in the acquisition of centrifugal force, so that the material. When the gas density reaches the working range of the mechanical vacuum pump, the vacuum pump is drawn out. Multi stage pump is the change in the volume of the pump chamber to achieve inspiration, compression and exhaust, so it can be a variable displacement of the centrifugal pump.
2. Single-stage pumps and multi-stage pump structure on the characteristics of the distinction between:
Single-stage pump comprises a pump body, a pump cover, with an output shaft of the motor, is installed in the single stage pump body and pump shaft and bearing, impeller, mechanical seal and mechanical seal gland, which is characterized in that. It also includes located at the output shaft of the electric motor is disposed between the pump shaft and the coupling of the clamp, and installation in the bearing seat to the guide bearing of the auxiliary supporting shaft; the clamp type couplings respectively with the output shaft of the motor and the pump shaft is rigid connection, in the output shaft of the motor and pump shaft between the left for mechanical seal and mechanical seal gland assembly and disassembly of the spatial distance. In the maintenance or replacement of mechanical seals, do not need to remove the motor and pump cover.
