The complete disassembly and repair of vacuum pump is called overhaul. The vacuum degree of some vacuum pumps which have not been removed due to partial disassembly and repair measures are still low and still have leakage; Or some pumps have one of the following phenomena: if the pump "stuck" phenomenon, the oil is very dirty, and the pump has been scaling, rust or improper oil to make the internal parts of the vacuum pump hard shell (silicone oil into the vacuum pump, this situation may occur), the vane has a big impact sound, the pump cavity fell into foreign matters (metal chips, glass chips, copper chips, etc.) scratch the pump cavity, friction It is necessary to disassemble the vacuum pump for cleaning and repair because of the severe temperature rise (over 70 ℃). So, what are the steps of vacuum pump overhaul? What should be paid attention to?

1. Cut off the power supply and unplug the power plug. If the pump is on the system, it should be removed from the equipment.

2. Screw the oil opening bolt to drain the oil and manually turn the pulley to drain the remaining oil in the pump chamber. The oil should be collected well. Generally, an iron oil pan or disk is placed under the bottom plate of the vacuum pump for collection, so as to facilitate distillation recovery and avoid environmental pollution in the future.

3. Remove the belt, remove the belt pulley and key, and disconnect the bottom plate. Depending on the quality of the motor (such as heat, dirt, dry grinding noise, large vibration, etc.), it should be repaired or sent to the electrician for oil washing repair.

4. First remove the low vacuum end cover plate (rear cover plate, that is, the end far away from the pump wheel), and use different tools according to different screws. For general hexagon screw, solid wrench can be used, and socket wrench should be used if necessary, so as not to damage the screw. After screwing the open cover plate screw, gently open the end cover plate. If the end cover plate is tightly closed, try to open it slowly. For example, file a small slot at the joint of the pump chamber and the end cover plate with a file, and then insert a driver (screwdriver) into the small slot and tap the handle of the driver by hand. You can also use a small hammer to tap the driver to exit the end cover plate. Do not hit it with heavy hammer.

5. If the rubber washer is used for sealing, remove the rubber washer and exit the locating pin.

6. Take out the rotor and rotor. Usually, there are two thread piercing daggers at the low rotor end, which can be easily pulled out by screwing in the thread rod. However, it should be noted that when pulling out the rotor, the rotating blade must be pinched tightly by hand. As the rotating blade is subject to large spring force, it is easy to fly out of hand, fall on the ground or hit hard objects, which will damage the edges and corners and surface of the rotor, resulting in endless scrapping.

7. Remove the high vacuum end and take out the high rotor and rotating blade. At this time, the rotor can be taken out by simply pinching the rotating blade and shaft by hand.

8. Before dismantling the pump, it is necessary to understand the structural characteristics of the pump to be repaired and the structure type of each component. For example, for those components that are components of the assembly, such as the rotors of some vane pumps, do not disassemble them, but make appropriate correction and adjustment on their surface; if the glass chips and metal foreign matters fall into the combined rotor and damage the cavity or the vane groove has been worn too much, the parts can be removed, but the assembly method should be remembered carefully.

9. Every time a component is removed, check its accuracy, finish and damage. Special attention should be paid to check whether the edges and corners of the rotor and rotor are damaged, and make records. For the pump repairers who are not familiar with the business, they should gradually remember the original location of each component and spare part, and make a record, so as to avoid mistakes when re assembling. At the same time, the removed parts should not be misplaced, piled up, damaged or lost. It is best to put it in a square disk, or put it in a wooden box and clean it. Cover it with silk cloth.