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Vertical multi-stage pump repair

14 Apr 2021Email

The vertical multi-stage water pump adopts the hydraulic model of the IS pump, which is an energy-saving product and is a vertical multi-stage multi-segment structure. The screw clamps the water inlet section, the middle section and the water outlet section into a whole. Each stage of the pump is equipped with an impeller and a guide vane. The axial force is solved by the hydraulic balance method, and the residual axial force is borne by the ball bearing and lubricated with grease. The shaft seal adopts soft packing or mechanical seal. Vertical multi-stage centrifugal water pumps are suitable for industrial and urban water supply and drainage, high-rise building pressurized water supply, fire pressurization, long-distance water supply, heating, bathroom, boiler cold and warm water cycle pressurization, air conditioning and refrigeration system water supply and equipment supporting occasions.

 

Maintenance method of vertical multistage centrifugal water pump

1. When the vertical multi-stage centrifugal water pump is overhauled, the motor control switch must be in the "off" position and a police card should be attached to avoid personal injury. When disassembling the multi-stage pump, mark the matching parts of the parts so that the installation can proceed smoothly; the small parts and fasteners removed from the multi-stage pump should be packed in boxes, marked, and the location should be indicated; more Clean the dismantled parts of the stage pump and apply anti-rust oil. If the painted surface is rusty, remove the rust and repaint it; the horizontal centrifugal multistage pump "O" ring, packing, and rust tightening Parts cannot be reused, spare parts are ready.

2. When the vertical multi-stage pump is repaired, first remove the pump from the storage tank, remove the motor and frame, remove the lower pump casing, remove the lower sleeve and impeller (note the anti-corrosion layer on the pump shaft) and loosen it. The upper bearing is seated with 6 hexagonal bolts, and then the main pump shaft and bearing parts can be pulled out together for maintenance.

3. When re-assembling the vertical multi-stage water pump after repairing and replacing the wearing parts, see to install the bearing seat and the bearing on the upper part of the pump shaft together, seal the upper and lower bearing caps, install the coupling and tighten the round nut, and correct the pump. For the curvature of the shaft, insert the pump with the bearing seat down into the pump body, and then install the bearing seat on the middle seat, adjust the gap between the impeller and the upper and lower pump casings, and use phenolic cement together with the impeller, the lower shaft sleeve and the impeller cap. Dip it on the pump shaft and wait for the phenolic cement to completely solidify before installing the lower pump cover. After the assembly is completed, turn the pump shaft on the coupling by hand to see if it is normal. For example, when replacing the bearing and pump shaft, first remove the round nut and coupling at the upper end of the pump shaft, loosen the 12 screws of the upper and lower bearing caps, and push the bearing up.

4. There are two periods in the maintenance of the opposing multi-stage centrifugal pump, one is during operation and the other is during shutdown.

(1) Leakage of multi-stage pump packing during operation of multi-stage pump; multi-stage pump lubrication water pressure; multi-stage pump lubricating oil level and bearing temperature; make a good operation log, such as horizontal centrifugal multi-stage pump water pump failure is more important detailed record.

(2) The multi-stage pump is out of service. Replace the old vertical multi-stage centrifugal pump packing; replace the vertical multi-stage centrifugal pump lubricating oil (at the pump thrust bearing box); flush the vertical multi-stage centrifugal pump water guide bearing with water every month for about 2 minutes; rotate the pump rotor at the same time ; Check the water skiing system of the run-horizontal centrifugal multi-stage pump and check whether the fasteners are loose.

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