How to repair the big cover and small cover of double-acting vacuum pump?

How to repair the big cover and the small cover in the double-acting vacuum pump? In the double-acting vacuum pump, the cooperation between the small cover and the blade is that the cone coordinates with each other and has relative motion. In the working process, the pump is most vulnerable to chlorine and sulfuric acid erosion, but also vulnerable to unclean gas, liquid solid glumes or impurities wear. After such wear and tear on the conical surface, uneven convex and concave defects will occur, which can be repaired by the following methods:
If the cover is not seriously damaged, the rust on the surface can be wiped off with No. 3 abrasive cloth, then coated with a thin layer of red red, the impeller is matched with it, and the impeller is rotated several times by hand, then the conical surface can be observed. The polished part of the small cover shows that it is a higher part and can be filed flat with a file. The red-red mark on the conical surface of impeller is also the higher part, which can be scraped off with a scraper. After preliminary repairs, reddish red paint is applied again. The small cover cooperates with the impeller and rotates. Repeat the above repair procedure. This is repeated many times until most of the red-red on the surface of the small cover cone matching is ground, and most of the surface of the impeller cone matching is evenly coated with red-red, indicating that the two matching surfaces are basically smooth and closely matched. At this time, two matching surfaces can be ground. First coat the conical surface of the small cover with rough abrasive sound, then grind the impeller with it. After several times, make the contact surface more than 80%, then grind with fine abrasive green, and finally rub off the abrasive with cotton yarn, and coat the surface with a layer of oil.
If the abrasion is serious, that is to say, the uneven surface of taper matching is prominent. In order to speed up the repair, one layer can be removed on the lathe first, and then repaired according to the above method.
After repairing the small cover, the wall thickness will inevitably decrease. Metal spraying method can be used to spray a layer of metal. In addition, the cone of the small cover is gradually smaller, on the contrary, the impeller space is gradually enlarged. After assembly, the impeller will inevitably not conform to the original assembly position. The end face of the impeller will meet the large cover at one end of the big diameter of the small cover, and the end face of the small diameter end of the small cover will meet the end face of the impeller shaft hole.
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