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Vacuum pump common troubleshooting method
1. Motor overheating
Possible causes: The motor is overloaded and the motor is overloaded; the motor is out of phase; the vent hole is blocked; the impeller drags other components.
Remedy: Reduce the water supply to the normal range (refer to the pump's instruction manual); check the wiring is firm; check the exhaust port; open the pump cover to adjust the gap between the impeller and other components.
2. The vacuum pump is not enough
Possible reasons: insufficient motor power supply leads to insufficient speed; insufficient water supply; excessive clearance between the impeller and the distribution plate; leakage of water leakage due to mechanical seal damage; excessive wear of the impeller;
Remedy: Check whether the power supply voltage is within the rated voltage range of the motor; increase the water supply amount (must be controlled within the correct range, otherwise the motor will be overloaded with heat); adjust the gap between the impeller and the distribution plate (usually 0.15 - 0.20) Mm ); replace the mechanical seal; replace the impeller; check the drain line.
3. Can't start or start noise
Possible causes: The motor supply voltage is insufficient; the motor is out of phase; the pump is used for a long time without causing rust; the pump sucks debris; the impeller drags the distribution plate.
Remedy: Check if the power supply voltage is too low; check if the motor wiring is solid; if the pump is not used for a long time, it can add rust remover or open the pump cover to remove rust; open the pump cover to remove debris; adjust the impeller The distance from the distribution board.
Sixth, the water ring type vacuum pump working night temperature is too high
Because the working fluid temperature is too high, the circulating water will vaporize, and the liquid will be converted into a vapor state. If the gas in the pump chamber is not discharged in time, the gas drawn by the water ring vacuum pump collides with the gas in the pump chamber. The steam has not been discharged, causing the vacuum to be too low or the pumping capacity not meeting the required requirements.
Approach:
1. Circulating water should not be used, and tap water should be directly connected to the water inlet of the water ring vacuum pump ;
2. Add a tubular heat exchanger or condenser to the inlet of the water ring vacuum pump to reduce the temperature of the gas.
Method for improving vacuum pump performance
1. Increase the vacuum and pumping group by lowering the temperature of the working fluid : knowing that the vaporization pressure of the liquid has a great relationship with the temperature of the liquid, the temperature is high, the vaporization pressure is high, and the vacuum of the pump is low, so the working fluid is lowered. The temperature is favorable to increase the vacuum degree of the pump. For the higher temperature working fluid, we need to increase the vacuum degree of the vacuum pump by reducing the temperature of the working fluid by heat exchange.
2. Replenishing working fluid : The replenishing working fluid must be continuously carried out. However, in what way to replenish the working fluid, how to determine the flow rate and pressure of the replenishing working fluid can improve the performance of the vacuum pump.
3. Special gas-liquid separation device to improve the utilization rate of dissolved gas:
The outstanding advantage of the liquid ring pump is that it can transport toxic, harmful, flammable and explosive gases without causing harm to the environment and people. Another outstanding advantage is that the compression process of the liquid ring pump can be considered as isothermal compression, so The compression of dry flammable and explosive gases does not present a risk of burning and explosion . However, if the pumped gas is dissolved in the liquid ring, the pumping amount of the liquid ring pump will change, and the more easily the gas in the liquid ring is dissolved, the greater the change in gas volume, the smaller the amount of gas pumped, so for this case, as far as possible in order to recover the liquid ring gas dissolved in a dry, gas-liquid separator may be provided in the structure shown in Fig. It can be seen from the figure that the gas discharged from the vacuum pump first enters the primary gas water separator, and the discharged gas is discharged from the separator, and the working fluid saturated with the dissolved gas is sent to the next lower pressure gas water separator. As the pressure is reduced, the gas dissolved in the liquid is released, and the released gas is sent to the inlet of the pump to participate in the circulation. Due to the recycling of the working fluid, the pressure of the liquid separated from the next-stage separator becomes very low, and it is necessary to pressurize the pump to refill the vacuum pump.