If the bipolar rotary vane vacuum pump is used improperly, there will be one or the other faults. How to repair the fault? Please listen to the Shanghai Bayu engineers.

1. Prepare the test means before performing maintenance.

2. Determine the fault and diagnose the fault. Judging can be a matter of course. Confirmation is to be verified.

3. Troubleshoot, first simple and then complicated, first easy and then difficult. No need to disassemble without dismantling. Vacuum pump units reduce new damage caused by lack of special tools and improper operation, reducing changes and running time. In general, the spliced ​​rotor is not detachable, otherwise the shape tolerance is not guaranteed and the rotor is scrapped.

4. Toxic, harmful and corrosive pumps should be cleaned first and the necessary protective measures should be given to ensure the health of maintenance personnel.

5. Fault classification

The fault is divided into operational faults and performance faults.

Operation failures may include the pump not turning, the pump temperature is too high, oil leakage, water leakage, maximum power exceeding the standard.

Performance failures may include extreme pressures, ultimate full pressure, pumping efficiency, noise, fuel injection, gas ballast performance, etc., or may not meet the requirements.

6. Fault diagnosis and diagnosis examples

(1) The pump does not turn. If the situation is unknown, the pump cannot be turned on first to avoid aggravating the fault. It can be moved by hand and cannot be moved.

1 pump can be rotated without turning. The cause can be a coupling failure; slippage; incorrect motor wiring; motor damage; power supply is not available.

2 can not be driven or heavy up, the reason may be because the starting pump temperature is too low, the viscosity of the pump oil is too high; the design and manufacturing reasons for stopping the pump too much oil. If the oil level of the water ring vacuum pump is too high, the pump will return too much oil ( too much oil , or water vapor will condense in the pump, or the water condensed in the exhaust pipe will flow back into the pump ) ; there is foreign matter in the pump ( intake pipe) Welding slag, oxide; debris of pump parts such as rotary vane spring; deformation of the rotary vane; seizure ( copper sleeve, rotor, middle wall, pump cover, stator, bearing ) .

(2) The pump temperature is too high. Refers to the highest oil temperature measured near the lower exhaust valve exceeding the value of the instruction manual. As the pump temperature rises, the viscosity of the pump oil drops drastically, and the saturated vapor pressure of the pump oil rises, so that the ultimate pressure of the pump rises and the pumping efficiency decreases; the rubber parts are easily aged; the thermal expansion reduces the running clearance, especially It is the thickness direction of some non-metal rotary blades and the clearance of the inner hole of the copper sleeve, which affects the reliability of pump operation. The reason why the pump temperature is too high may be that the pump temperature is too high, the intake air temperature is too high, the intake air cooling device is invalid, the inlet pressure of the pump is continuously operated for a long time; the cooling water volume of the water cooling pump is insufficient, and the circulating water design effect is not good; the temperature control water quantity is insufficient; Regulator valve failure, etc.

(3) Oil leakage. It can occur in the shaft seal, the sealing surface of the fuel tank and the pump parts, the oil drain plug, the oil mark, the oil hole bulkhead, the through hole connection of the stator part and the support, and the gas ballast valve ( for example, 2X-8) . It can be caused by the aging of the seal, improper installation, damage failure, uneven surface, impurities, roughness and loose casting. If the oil is returned after stopping the pump, the oil will enter the gas ballast valve, and the gas ballast valve may leak oil if it is not closed.

When making rubber mats, be sure to use oil-resistant rubber, according to the original design shape, when the sealing surface is too large, the pressure will not leak tightly.

(4) Water leakage can occur in water pipe joints, water jackets, flat surface, water discharge screw plugs, drain valves, etc., water jacket drilled, casting defects, freeze cracking, may also lead to water leakage.

(5) High power exceeds the standard. The long-term continuous inlet pressure is too high, the exhaust pressure is too high, the debris enters the joint, the pump temperature is too high, the rotating gap of the rotary vane is too small, the voltage is too high, and the pump liquid is returned to the pump too much. The motor will be damaged. Long-term continuous operation near maximum power should be avoided as much as possible. If there are deposits on the surface, remove them regularly.

(6) The ultimate pressure is not up to standard.

It can be caused by external leakage, internal leakage, oil hole blockage, poor pump oil quality or pollution deterioration, condensable substances such as water vapor, distortion of instrumentation, and abnormal operation of the pump.

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