Use and repair of gear pump

(A). Use 1. The suction height of the gear pump is generally not greater than 500mm;

2. The gear pump should be connected with the motor through a flexible coupling so as to avoid unilateral stress, which may cause the gear pump shaft to bend. Unilateral wear and pump shaft oil consumption failure;

(II) After the gear pump is repaired for a long time, the relative sliding surfaces of the gears will be worn and scratched. The wear of the end face will cause the increase of the axial clearance, the wear of the gear circle will increase the radial clearance, and the wear noise of the tooth profile. Increase.

1. Gear 1 tooth repair: remove the burrs that have been scratched or have been ground into multi-angled parts with the spinning paper or oil stone, and then change the orientation of the gear meshing surface to be appropriate. After cleaning, it can continue to be used. However, it can be observed with the naked eye. Serious wear parts should be replaced;

2. End-face repair: Slight wear, can put two gears at the same time on the 0 # sandpaper rubbing and polishing. Serious wear and tear when the two gears can be placed on a flat grinding machine to remove a little, and then into the phase sandpaper polishing. At this point the pump body should also wear away the same size. The difference between the two gear thickness is within 0.005mm, the perpendicularity of the gear end surface and the hole should be controlled within 0.005mm;

3. Tooth circle: The gear pump gear will generally wear under the radial imbalance force F. After the tooth head circle is worn, it has little effect on the volumetric efficiency of the low-pressure gear pump, but for the high and medium pressure gear pump, Should consider plating round or change gears.

2. The main body of the pump body is the inner surface of the gear and the top surface of the gear teeth, and the oil suction side occurs. If the pump body is of a symmetrical type, the pump body can be flipped by 180 degrees to install it.

3. Front and rear covers The front and rear covers are mainly assembled, and the contact end surfaces of the sliding contact with the gears are worn and strained. If the wear and strain are not serious, the end faces can be repaired. The wear and tear are serious and can be worn on the surface grinder. The groove marks. However, at this time, the depth of the unloading groove of the trapped oil becomes shallow, and it is not effective for eliminating trapped dead volume.

4. The pump shaft gear pump shaft failure mode is mainly the contact with the needle roller bearing is easy to wear, a small amount of bending occurs. If it is slightly worn, it can be polished and repaired. If it is seriously worn, it needs to be re-machined. The keyway has parallel and symmetry requirements on the centerline. The fit between the flat key and the tooth keyway installed on the shaft must not be too large. The shaft must not generate radial oscillations in the gear. The surface of the journal and the shaft of the mounting gear must match. The concentricity is 0.01mm and the concentricity of the two journals is 0.02-0.03mm.