Although the failures of mechanical vacuum pumps are varied, most failures can be ruled out. Sometimes, a new rotary vane vacuum pump , for some production applications, still feels that its ultimate vacuum is not high enough, and maintenance workers can try to improve it as much as possible. The solution can be found from the maintenance methods, procedures, and analysis of key parts described below. Dongguan Punok Vacuum Technology Co., Ltd. has long been committed to the vacuum pump maintenance service, with vacuum pump maintenance experience to share with you the vacuum pump repair some repair experience.
Some pumps, according to their ultimate vacuum, are not very low, but they are expected to improve in production. How should we proceed?
The repair experience for the following new PNK SP 030 rotary vane vacuum pump can be used for reference. When the pump was initially tested, it did not find any major problems. It is used in production to draw a single vacuum and hope to stably reach more than 75 grids of thermocouple vacuum gauge (equivalent to 5X10; support) of Mai's training, but in fact it is not much lower than expected.
When repairing, after disassembling it, the gap size of the main part is measured: rotor cut point gap Q 04 nom, high vacuum chamber double side gap Q 07 mm, low vacuum chamber double side gap a 08 mm, rotor shorter than rotary vane 0 02mm. These data are compared with Table 2 and are still in the normal range.
For the repair of such a pump, consider starting from reducing its gap tolerance. First, try to change its eccentricity value: change the intermediate sleeve to an eccentric sleeve to reduce the upper tangent point clearance to 0 02 mm; grind the high vacuum chamber pump chamber to Q 03 mm, and vacuum the low vacuum chamber pump chamber. 0 04 mm. After cleaning, put it on the platform and assemble it (without locating pin). While assembling, push the pump wheel by hand and tighten the fastening screw with a diagonally uniform principle. According to experience, if the outer surface of the rotor is a perfect circle, when turning the pump wheel, no matter which point, there should be no feeling of blockage; but if the assembly is not correct or the outer surface of the rotor is elliptical, when the pump wheel is turned, it will A half-cycle round and a half-round wheel feel light. The pump assembly clearance is reduced very small, and the assembly is slightly inadvertent, and the installation is not correct, so that it is easy to be stuck or damaged during operation due to friction and heat. So be careful and meticulously assembled. After the installation, the vacuum was measured by a thermocouple vacuum gauge of 82 grids, which was equivalent to 8X103 Torr by the curve and 2X 104 Torr by the Mais measurement. The vacuum is slightly improved after a period of operation.
This example shows:
1 The assembly of the rotary vane and the rotor is very important, and the upper tangent point gap between the rotor and the pump chamber, the gap between the rotary vane and the end cap, ie the high and low vacuum chamber double-sided clearance and the rotor tangent point clearance are repaired and The key to manufacturing. Even so, if the assembly is not proper, the material of the pump is too poor, and there is a danger of jamming or grinding. Therefore, it should be decided by experiment in practice and cannot be treated uniformly.
2 Generally, the pump with poor vacuum can properly adjust the assembly clearance and oil path, which can get better results.
3 The gap measurement should be conscientious and accurate. Except that the calibration should meet the specified accuracy, the workpiece should be cleaned and dried, and the measurement is repeated several times. Take good notes. Then, the various aspects of the rotary vane vacuum pump are combined to determine the size of the grinding. When testing the performance of the pump, the relative gauges such as the thermocouple vacuum gauge should be calibrated.
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