Roots FansWhat are the key places in the maintenance process that you need to know? On this issue Roots fan small editor to take you to understand.
1. It is necessary to ensure that the Roots fan and the pipeline is smooth
During the maintenance period, the Roots fan must be cleaned and inspected on the components on the inlet pipeline; it must be cleaned out of the dust collection and sludge in the casing; and it must be inspected whether the outlet components and pipelines are smooth.
2. The safety valve is flexible, reliable and effective
Because the Roots fan is a fixed-capacity fan, if the ventilation is not good, the pressure will continue to rise until the motor crapped out or the casing was destroyed, if the safety valve in the rated pressure or in the allowable set pressure naturally open, the above failures can be avoided; so that the equipment and personal safety can be guaranteed.
3. Three clearances must be ensured for the Roots fan
The three clearances of a Roots fan are the radial clearance between the rotor and the casing, the clearance between the rotor and the rotor, and the clearance between the side of the rotor and the wall of the casing. Installation and maintenance must be carried out in accordance with the relevant maintenance manual. If no clear or no clear requirements are found, then the minimum clearance can be calculated according to the following formula.
Radial clearance between rotor and shell: 0.00036D+a, where D is the maximum outer diameter of the rotor in m and a is the radial clearance of the bearing in mm.
Minimum clearance between rotor and rotor: 0.00036A+a, A is the center distance between two rotors in mm, a is still the center distance between rotors in mm.
The side clearance between the rotor and the wall plate is: 0.00036L+b, L is the length of the rotor in mm, and b is the axial clearance of the bearing in mm.
4. Accurate pin positioning
Roots fan has three positioning must be accurate, otherwise it will affect the operation of the fan, which the upper and lower housing pin and the pin of the gear box in the maintenance of the basic is not changed, so overhaul only need to be installed correctly. For gear payment is different, when replacing the gear, the first keyed gear installed, fixed, and then installed another, and another gear bonding surface fits well after locking, disk car check tooth contact, if no problem, re-punch pin hole and fine reaming, after installing the pin, and then disk machine to check the precision of gear contact, if good, the casing and the impeller, impeller and impeller do not friction and do not touch, it is OK.
5. Pulley Installation
When installing the pulley to find the right, must ensure that the corresponding belt groove in the same plane and the error is less than 1.0mm, and to ensure that the belt elasticity is appropriate, the length of the belt is the same, the force is the same. Belt tightness to the thumb by the belt can move down 15mm or so is appropriate.