Repair knowledge of small cover of rotary vane vacuum pump

Today, the technicians of Central Vacuum Pump briefly introduce the repair knowledge of the small cover of rotary vane vacuum pump, hoping to help you.
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 is applied again. The small cover cooperates with the impeller and rotates. Repeat the above repairing 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, and 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 surface of taper fit is not smooth, in order to speed up the repair, you can first go to a layer on the lathe, and then repair 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, and the end face of the impeller will meet the large cover at one end of the big diameter of the small cover, while 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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