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Assembly and disassembly sequence and precautions of horizontal high-pressure centrifugal water pump

01 Jun 2021Email

Assembly of horizontal high pressure centrifugal water pump

  The assembly sequence of the horizontal high pressure centrifugal water pump is generally opposite to the disassembly sequence. The quality of the assembly directly affects the normal operation of the pump, and affects the service life and performance parameters of the pump. Pay attention to the following points when assembling:


  1. The machining accuracy and surface roughness of the parts should be protected, no bumps, scratches, etc. are allowed, the molybdenum disulfide used for sealing should be clean, and the tightening screws and bolts should be evenly stressed;

  2. The neutrality of the impeller outlet channel and the guide vane inlet channel is guaranteed according to the axial size of each part. The neutrality of the channel directly affects the performance of the pump, so the size of the pump cannot be adjusted at will;

  3. After the pump is assembled, before the packing is installed, turn the pump rotor by hand to check whether the rotor is flexible in the pump and whether the axial displacement meets the specified requirements;

   4. After passing the inspection, press in the packing, and pay attention to the relative position of the packing ring in the packing cavity.

 

   Disassembly sequence of horizontal high pressure centrifugal water pump

   1. After removing the pump coupling, unscrew the bolts on the bearing gland, the coupling nut of the water inlet section and the bearing body, and then remove the front bearing body;

  2, unscrew the round nut on the shaft and remove the bearing inner ring, bearing gland and retaining ring in turn;

  3. Pad up each middle section with spacers, remove the threaded nut, remove the water inlet section, and the packing gland, packing ring, packing, etc. on the water inlet section;

  4. Remove the front impeller, flat key, positive guide vane, positive impeller, final positive guide vane, outlet section, middle throttling and pressure reducing device in sequence;

  5. Remove the last-stage anti-guide vane, last-stage anti-impeller, flat key, anti-guide vane, anti-impeller, rear throttling, and decompression device in turn. Be sure to pay attention to the direction and order of the forward and reverse impellers and guide vanes;

  6. ​​Unscrew the nut between the secondary water inlet section and the tail cover, and remove the main shaft, tail cover and rear bearing body parts;

  7. Unscrew the nut between the tail cover and the bearing body, and remove the packing gland, packing ring, packing, etc. on the tail cover;

   8. Unscrew the bolts on the rear bearing gland, remove the bearings, small round nuts, and bearing caps in turn;

   9. For pumps with sliding bearings, the disassembly sequence is basically the same, only slightly different when disassembling the bearing parts.

 

   Points to note when disassembling the horizontal high-pressure centrifugal water pump

  1, stop in the order of parking;

  2, the liquid in the pump casing (including cooling water) should be drained; when the bearing parts are thin and lubricated, the lubricant should be drained;

  3. Remove the auxiliary pipelines that hinder the disassembly, such as balance pipes, water seal pipes and other pipelines and leads;

  4. The disassembly should strictly protect the manufacturing accuracy of the parts from damage. When disassembling the rod, each middle section should be cushioned to prevent the middle section from loosening and sinking and bending the shaft.

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