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Although the failures of vacuum pumps are varied, most failures can be eliminated. Sometimes, a new 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 to analyze some of the previous maintenance methods, procedures, and key parts. You can find a solution.

Some pumps, according to their ultimate vacuum, are not very low, but they are expected to improve in production. How to proceed? For a new 2X-30 rotary vane seal machine Vacuum pump repair experience can be used for reference. When the pump was initially tested, it did not find any major problems. It is expected to be able to stably reach the thermal couple vacuum gauge of more than 75 grids (equivalent to 5*10-4 Torr of the Mehler measurement), but in fact it is not much lower than expected.

During the repair, the gap size of the main part was measured after disassembly: the rotor tangent point gap was 0.04 mm, the high vacuum chamber double-sided gap was 0.07 mm, the low vacuum chamber double-sided gap was 0.08 mm, and the rotor was 0.02 mm shorter than the rotary vane. These data are normal ranges.

For the repair of such a pump, consider starting from reducing its gap tolerance. First, try to change its eccentricity: replace the intermediate sleeve with an eccentric sleeve to reduce the upper tangent gap to 0.02 mm; the high vacuum chamber pump chamber to 0.03 mm, and the low vacuum chamber pump chamber to 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, 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 8*10-3 Torr by the curve and 2*10-4 Torr of 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 careful and accurate. Except that the measuring tool should be calibrated to meet the specified accuracy, the workpiece should be cleaned, dried and dried, and the measurement is repeated several times. Take good notes. Then, in all aspects of the pump, the size of the grinding is determined.

When testing the performance of the pump, the relative gauges such as the thermocouple vacuum gauge should be calibrated.

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