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May 18, 2022 View:

How to reasonably replace the mechanical seal of the lobe pump

For lobe pumps, the big wearing part is the mechanical seal, which generally has a service life of 7000-8000 hours under continuous use. But the use of the working conditions, the environment is not ideal, its service life will be greatly reduced. It is necessary to learn to replace the mechanical seal reasonably and correctly to extend the service life of the lobe pump as much as possible. When replacing the mechanical seal, the power supply of the lobe pump must be disconnected. Prevent injury during seal replacement due to accidental start-up. The specific steps are as follows: 1. Remove each cover nut on the rotor chamber cover and take off the rotor chamber cover. 2. Use a copper rod or wooden block to pad between the two rotors and use a wrench to remove the two rotor fixing nuts. (Note: the direction of rotation of the shaft can be used to determine the direction of the fixed nut screwing loose, i.e. the direction of the fixed nut screwing loose and the direction of shaft rotation.) 3.lobe pump Pull out the two rotors by hand. (If you cannot pull out the rotor by hand, please follow step 4) 4. Remove the two fixed nuts of the rotor chamber and hammer the back sides of the rotor chamber with a brass rod until the rotor chamber can be removed by hand. (If the rotor is not taken off when operating step 3, the rotor will also be taken out with the rotor chamber) Note: At this time, you may see in the two drive shaft shoulders with adjustment shims, please record the location and number of adjustment shims at the shaft when you take them off, so that the original position and number can be installed when assembling again. 5. Remove the static and dynamic rings need to be replaced. 6. The installation of the static ring: align the intact static ring with the three pins on the rotor chamber and press it into the installation hole of the rotor chamber with even force by hand until the O-ring on the static ring also enters the installation hole. 7. The position of the two screws on the moving ring should be consistent with the position of the two planes on the shaft. Gently screw into the two screws on the moving ring until you feel the bottom of the screw contact with the shaft plane, then screw loose 1 to 2 screw teeth, so that the moving ring on the shaft can rotate about 5, remember not to make the moving ring can rotate 360 on the shaft. Then drip a small amount of paint or grease into the screw hole to prevent the screw from falling off when the equipment is in operation. 8. Carefully insert the rotor chamber with the static ring along the drive shaft, and make the two conical pins on the rotor chamber into the two pin holes on the drive box, screw in the rotor chamber fixing nut, and insert the iron bar into the two locating pin holes on the rotor chamber, lobe pump hammer the two locating pins respectively until the locating pins are installed. The two locating pins until the locating pins are in place, then lock the rotor chamber fixing nut to make the rotor chamber position consistent with the original factory position. 9. Install the original well-recorded adjustment thin shims on the drive shaft respectively as is. 10. Install the rotor into the rotor chamber with a copper rod or wood block pad between the two rotors and lock the rotor fixing nut. Note: ①The rotor, rotor fixing nut and drive shaft have been numbered at the factory, please install the parts with the same number together when assembling, and you can see the respective numbers after this step is completed. The direction of rotation of the shaft can be used to determine the direction of tightening of the fixed nut, i.e. the direction of tightening of the fixed nut is opposite to the direction of rotation of the shaft. 11. hand disk lobe pump coupling, rotate along the lobe pump steering mark for a week, test the clearance between the rotor and the rotor, the rotor and the rotor chamber around the inner cavity and the bottom plane should be roughly the same, no touching phenomenon. 12. use a flat ruler on the outer plane of the rotor chamber at different The rotor chamber cover is assembled on the rotor chamber, and the upper plane of the cover is basically flush with the upper plane of the rotor chamber, and the cover nuts are locked. 14. 15. Install the coupling housing, turn on the power, start the lobe pump, make sure there is enough liquid in the pipeline, observe whether there is leakage of the mechanical seal, if there is no leakage, it means the mechanical seal has been replaced.