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Common failures of vacuum pumps and how to deal with them

Time：

Apr 19,2016

Common failures of vacuum pumps and how to deal with them

I. Difficult to start

1. Power supply is faulty Method: Check whether the power is off or the power supply is out of phase.

2. Foreign body into the pump, impeller stuck Method: Flush with water, or open the pump to check.

3. Packing pressure is too tight Method: Loosen the packing gland bolt, start the pump, and then slowly tighten the gland bolt until a little water flows out.

4. Scale or rust Method: Soak with 10% oxalic acid for 30~60 minutes.

5. Excessive working fluid Method: Adjust the working fluid to the shaft line of the pump.

II. Motor overload

1. Short circuit of the winding Method: Check the motor winding.

2. Working fluid flow is too large Method: Adjust the working fluid inlet valve to reduce the working fluid flow.

3. Exhaust pressure is too high Method: Reduce the exhaust pressure to the specified range.

4. Excessive liquid content in the inlet gas Method: Install a separator at the inlet, or reduce the working fluid volume.

5. Exhaust valve piece is damaged Method: Replace the exhaust valve piece.

III. No vacuum

1. Wrong motor steering Method: Change two motor power cables.

2. No working fluid into the pump Method: No working fluid into the pump.

3. Serious air leakage in the system Method: Check the leakage by pressure and repair.

IV. Low vacuum level

1. Small working fluid flow method: increase the working fluid flow, while observing the motor current can not be overloaded.

2. Working fluid temperature is too high Method: Reduce the working fluid temperature.

3. Mild leakage of the system Method: Check the pressure and repair the leakage.

4. Pump gap is too large Method: Repair the vacuum pump to reduce the gap or return to our company for overhaul.

5. Leakage of pump seal Method: Replace packing or mechanical seal.

6. Vacuum gauge is not allowed Method: Replace the vacuum gauge.

7. Exhaust valve piece off Method: Replace the exhaust valve piece.

8. Small pump selection Method: Replace the suitable pump.

9. Low local atmospheric pressure Method: Test the vacuum pump by absolute pressure.

V. Large vibration/noise

1. Serious cavitation Method: Add cavitation protection device.

2. Too much working fluid Method: Reduce the flow rate or install flow meter.

3. Poor shaft coupling alignment Method: Recalibrate the concentricity of the shaft coupling to make it meet the standard.

4. The foot bolt is not fixed Method: Fasten the foot bolt.

5. Impeller is not balanced Method: Re-balance the impeller.

Vacuum heat treatment of soft magnetic materials

Application of partial pressure in vacuum heat treatment

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Vacuum heat treatment of soft magnetic materials

Application of partial pressure in vacuum heat treatment