For a rotary pump, the largest consumable part is the mechanical seal. Generally, it can have a service life of 7000-8000 hours under continuous use. However, the working conditions and environment used are not ideal and their service life will be greatly reduced. It is necessary to learn to change the mechanical seal reasonably and correctly and to extend the service life of the rotor pump as much as possible.

When replacing the mechanical seal, the rotor pump must be disconnected from the power supply. Prevents accidental injury due to accidental start-up during seal change.

Specific steps are as follows:

Remove each cap nut on the rotor chamber cover and remove the rotor chamber cover.

Use a copper rod or wooden block between the two rotors and use a wrench to remove the two rotor retaining nuts.

(Note: The loosening direction of the fixing nut can be judged according to the rotation direction of the shaft, that is, the loosening direction of the fixing nut is consistent with the rotation direction of the shaft.)

Pull out the two rotors by hand. (If you can not pull out the rotor by hand, please follow the fourth step)

Remove the two fixing nuts from the rotor chamber and hammer the back of the rotor chamber with copper rods until the rotor chamber can be removed by hand.

(If the rotor is not removed in step 3, the rotor will also be removed with the rotor chamber.)

Note: At this time, you may see adjustment shim at the two drive shaft shoulders. When you remove it, please record the position and quantity of the adjustment shim at the axis, so as to install according to the original position and quantity when reassembling.

Remove the need to replace the static ring and moving ring.

Installation of static ring: Match the intact static ring with the three pins on the rotor chamber, press evenly into the mounting hole of the rotor chamber by hand until the O-ring on the stationary ring also enters the mounting hole.

Installation of the moving ring: Push the intact moving ring into the end of the drive shaft until the bottom of the moving ring contacts the shoulder of the shaft. 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 in two screws on the moving ring until you feel the bottom of the screw contact with the shaft plane, then loosen 1 or 2 screws to make the ring rotate about 5?? on the shaft. Remember not to make the ring Can rotate 360?? on the shaft. Then add a small amount of paint or ointment to the screw holes to prevent the screws from falling off while the equipment is running.

Carefully move the rotor chamber with the stationary ring along the transmission shaft and insert the two conical pins on the rotor chamber into the two pin holes on the transmission case, screw in the rotor chamber fixing nut and insert the iron rod into the rotor chamber. The two positioning pin holes hammer the two positioning pins respectively until the positioning pins are in place. At this time, the rotor chamber fixing nut is locked so that the position of the rotor chamber is consistent with the original factory position.

The original adjustment shim is mounted on the drive shaft as it is.

Mount the rotor into the rotor chamber and use a copper rod or wooden block between the two rotors to lock the rotor retaining nut.

Note: 1 Rotor, rotor fixing nut and drive shaft are numbered at the factory. When assembling, please put the same number of parts together, and after the completion of this step, you can see the respective number. 2 The tightening direction of the fixing nut can be judged according to the rotation direction of the shaft, that is, the tightening direction of the fixing nut is opposite to the rotation direction of the shaft.

The coupling of the hand-rotor pump is rotated one revolution along the turning sign of the rotor pump. The clearance between the rotor and the rotor is detected. The gap between the rotor and the inner surface of the rotor chamber and the plane of the bottom of the rotor chamber should be approximately the same, and no rubbing phenomenon occurs.

Use a flat ruler on the outer surface of the rotor chamber at different positions. The clearance between the rotor and the flat ruler should be approximately the same as the gap measured in step 11. No rubbing occurs.

The rotor chamber cover is assembled on the rotor chamber, and it is ensured that the upper plane of the chamber cover is substantially flush with the upper plane of the rotor chamber, and each cap nut is locked.

The coupling of the hand-rotor-rotor pump senses whether or not the rotor pump has rubbed during rotation. If no rubbing occurs, it indicates that the assembly has been completed.

Install the coupling housing, turn on the power supply, start the rotor pump, and ensure that there is sufficient liquid in the pipeline. Observe whether the mechanical seal has leakage. If there is no leakage, the mechanical seal has been replaced.