Vertical long-axis pump is often used in steel plant water treatment system, ocean engineering float water intake and water conservancy engineering pump and other scenes, which depends on its unique characteristics and advantages, in this paper, long-axis pump manufacturer Zoomlian pump Industry from the vertical long-axis pump structure form and high efficiency to introduce the "moat" of vertical long-shaft pump.
First, vertical long shaft pump structure form
The name vertical long-shaft pump is named according to the structure of the pump. Long shaft refers to a series shafting consisting of a single shaft or multiple shafts that requires three or more supporting points. It is this characteristic that the vertical long-shaft pump allows a great change in the length direction, without changing the external characteristics of the pump, the length of the pump can reach tens of meters, the short can only be a few meters, the intermediate shaft and the intermediate nozzle can be selected as needed, in order to change the length of the pump.
Vertical long-shaft pump is mainly composed of rotating parts (including impeller, spindle, sleeve, coupling, etc.), fixed overflow parts (including suction horn, guide vane body, external nozzle, spit bend, etc.), lubrication and sealing system (including packing seal, internal nozzle, water bearing, bearing bracket, etc.), thrust bearing device (motor to withstand axial thrust without).
Second, the reason for the high efficiency of vertical long-shaft pump
The impeller and guide vane are the main hydraulic components of the pump, and the impeller is generally located about one meter below the liquid level. When the pump works, the liquid flows evenly to the impeller through the suction horn, and the centrifugal force generated by the rotation of the impeller efficiently converts the mechanical energy of the prime mover into the pressure energy and velocity energy of the pumped liquid.
After the guide vane body is rectified and part of the velocity energy is converted into pressure energy, the liquid is discharged into the pipeline system along the flow channel composed of the outer nozzle and the spit pipe. In addition to the mechanical loss, hydraulic friction and volume loss that are common in general pumps, there are no other additional losses, so the efficiency is high. The impeller is submerged in water, which greatly increases the cavitation allowance of the device, so pumping the high temperature medium will not produce cavitation.