| 摘要 |
A composite drive shaft for a pump 1 for handling a corrosive and/or abrasive fluid and a method of manufacturing it are provided. The composite shaft comprises a first part 12 of a first metal / alloy resistant to the corrosive/abrasive fluid, connected to the pumping elements 3 of the pump 1. When in use, the first part 12 is actually or potentially in contact with the corrosive / abrasive fluid inside the pump 1. The first part 12 extends outside the pump body through a rotary seal 5. The shaft further comprises a second part 9 of a second cheaper metal/alloy, axially aligned with and abutting the first part 12 and connected to the extended length of the first part 12 by a butt friction weld. The second part 9 of the composite shaft is connectable to the power source for driving the pump 1. Both first and second metals/alloys have adequate mechanical properties to operate the pump reliably for a full working life. |
