Vertical axial-flow pump belongs to the blade, the pump has the big flow, low head, high rotation, high efficiency, cover an area of an area small, performance parameters variability, and suitable for low water conditions, etc. Accordingly, often become agriculture irrigation and drainage, city water supply and drainage, power transmission project priority of circulating water pump type selection.
A, basic structure and function
By breathing in pools of water flow through to, through the inhaled horn tube, because indoor impeller impeller in force water rotation, and water into the diffuser, body, to produce energy conversion of head and flows through pump cylinder from drainage tube bending eduction. Pump through the coupling (rigid) and aligning intermediate shaft coupling. Under the support of motor rotor bearing all down the axial force. Intermediate bearing and the motor shaft coupling with flexible coupling.
The axial impeller (wheel body) with blades, according to whether the blade can be adjustable pump performance parameters change, hoping the following three points:
Fixed axial-flow-impeller (wheel body) and blade for the whole structure, the leaves can not be adjusted;
Half a regulation axial-flow impeller blades-(wheel body) and blade for composite structures can only downtime, dismantling the leaf blade adjustment placed Angle (such as 0 °, ± 2 °, ± 4 °, ± 6 °, ± 8 °), the Angle of control is the cascade;
Adjust the blade-through a set of reliable regulation institutions (mechanical or hydraulic pressure), pump can be used in the operation manual and electric, computer control methods was Angle of the blade stepless adjustment.
Second, inlet and wet pit, dry pit installation
Axial-flow (especially large pump) to the inlet type and size requirement is very strict, it directly influence the performance of the pump (such as pump efficiency, cavitation performance, etc.), so must through the formal design (design institute design).
Wet pit installation, refers to the pump all or part of the submerged in pumping fluid, pump partly submerged in inhaled pool;
Dry pit installation, refers to the pump for all surrounded by air, the water flow in the form of cubits pump.
Three, pump installation foundation and the discharge tube bending row export position
Double foundation installation: next foundation pump installation, motor installed in motor foundation (foundation). The force pump shaft bearings by motor bearing, pump running when the load conditions based
Foundation under stress = pump shell weight + pump water pump shaft shell weight-to water thrust
Motor foundation stress = motor pump rotor heavy weight + + pump shaft thrust to water
Single foundation installation: the pump and motor make a whole straight association-like structure, installation in the motor basis, pump shaft and the motor shaft coupling with rigid connection, pump running when the load based:
Motor foundation (single foundation) force = pump shell weight + pump and motor rotor heavy weight + pump water heavy shell
Double base discharge tube bending in between two foundation, single base can be set up according to need in above basis.
Four, rotor can drawer-type structure
Usually the rotor and pump body for the "whole" structure, the essential maintenance pump remove hoisted out, in order to maintenance convenience, adopt the rotor can drawer-type structure. The rotor components (including guide blade body), from the pump cylinder and the discharge tube bending out, not only avoid the discharge pipe removal, and reduce the weight lifted.
Five, the pump bearing of pump shaft lubrication and protection
Conveying water under normal temperature, water lubrication rubber bearing, can be used to transport medium lubrication, pump shaft without protection device, in transmission contain arenaceous water (such as the Yellow River water) or corrosive medium (such as sea water), shaft and bearing, use the (set) tube protection of and medium isolation, with the water for lubrication.



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