The use and installation of long shaft pumps
Release time:
2022-07-07
Source:
The long-axis pump determines maintenance projects based on the data from the operation technology development status monitoring system, conducts preventive inspections according to cycle management, and analyzes, repairs, or replaces defective components. When disassembling and replacing major components, it should comply with the main maintenance quality standards.
The long shaft pump determines maintenance items based on the data from the operational technology development status monitoring system, conducts preventive inspections according to cycle management, and analyzes, repairs, or replaces defective components. When disassembling and replacing major components, it should meet the main maintenance quality standards.
The main maintenance items, content, and quality for the long shaft pump include: 1. Descaling and rust removal; non-machined surfaces can be coated with non-toxic waterproof anti-rust paint. 2. Cooling water holes, pressure gauge holes, and exhaust holes should be unobstructed. 3. When the erosion thickness exceeds one-third of the original wall thickness, repair or replace the wall of the casing or guide vane. 4. Shape and fit tolerances must meet the requirements of the technical development information in the drawings. 5. After repairing or replacing the impeller with a new one, a static balance test should be conducted; the allowable deviation for static balance on the impeller's maximum diameter should be consistent with current standards. 6. After removing static unbalance weights, grinding should be uniform and smooth; the grinding thickness must not exceed one-third of the original cover plate thickness. 7. The fit tolerance between the closed impeller and shaft must comply with the current national standard for tolerances and fits H8/h7 requirements. 8. The taper of the semi-open impeller and cone sleeve should be consistent, and the contact area must not be less than 60% of the area used by the enterprise for fitting. 9. The operating clearance between the sealing ring and impeller of closed impellers should comply with national regulations; long shaft pumps and well submersible pumps must comply with legal requirements. When wear time exceeds 50% of the specified gap in the table, a new sealing ring should be replaced.
New type of submersible long shaft pump: No adjustment is needed after installation. No maintenance is required during operation within its designed service life.
Long shaft submersible pump: axial thrust bearing mode. When the pump is driven by a standard vertical motor, the weight of the pump rotor and axial thrust are borne by thrust bearings installed at the upper part of the pump. The pump can be innovatively driven by analyzing the weight of the rotor and axial thrust when using a vertical motor with thrust bearings from China. When driven by a right-angle gearbox, the weight of the pump rotor and axial thrust are borne by thrust bearings installed within the right-angle gearbox. Thrust and bearing lubrication: Thrust calculation bearings are usually lubricated with thin oil (small pumps can also use a type of grease for lubrication). A cooling jacket can be set outside the bearing body to allow cooling water to cool down oil temperature. Guide bearing lubrication: If the medium transported by the pump is clean liquid, it can directly use guide bearings to lubricate with transported medium. External pressure water lubrication: If there are small impurities in the medium transported by the pump, clean water needs to be obtained from outside for lubrication (the pump uses an automatic shut-off sealing system that prevents impurities from entering guide bearings when closed). Installation working method: Generally installed on the same economic foundation layer as the pump unit.
Long shaft pump
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