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Common problem how to avoid - roots vacuum pump

by:J&T     2020-05-21

in the selection and management roots pump, many errors are not uncommon. We need to consider each pump model effective specific parameters, to avoid the error. Small make up today I will take you to learn more about common operation, selection and maintenance of roots pump, hope to be able to help you.

roots water pump - Structure and high pump speed

roots pump needs to be run under pure volume level, compared with the rotary vane vacuum pumps, roots pump has no internal compression. It can compress the exhaust pressure. All parts are not in contact with the medium oil.

this is why the roots pump is called the 'dry pump'. Its main characteristic is compact structure, high pump speed. Roots pump is named after the inventor of his brother.

common roots pump operation, and maintenance methods

1. Working under extreme pressure

to run under the maximum differential pressure of roots pump, is not recommended before cooling under extreme pressure to run directly. Under extreme pressure, due to the vacuum pump too fast, the minimum or zero gas flow through a gas or shell surface is sending out no heat. Due to the sudden high temperature, the air gap between rotor and shell is too small, the pump will stop running. In severe cases, this will lead to a vacuum pump.

2。 Temperature fluctuations, improper

in roots pump is still very hot, the environment temperature suddenly dropped sharply will lead to pump casing contraction, resulting in water pump stop rotating. As shown in figure 1, which is especially important when working under extreme pressure. Therefore, must be avoided at all costs the sudden changes in the ambient temperature. In addition, the operator must be careful not to open the shutters and the other near the door suddenly, especially in winter. In addition, for those messenger pumps, they should be under the roof or awning, to avoid the rain.

if at the time of the fire water directly to pump, pump shell might explode, especially those made of grey cast iron water pump shell. Ductile iron version of pump, due to its high strength of materials, better suited to withstand the heat wave.

3。 Temperature control

if the roots pump running under the maximum differential pressure, need to install a temperature sensor in the exhaust end, to prevent overheating and any damage caused. This will generate alarm at finite temperature, and reach the maximum allowable temperature shut down the pump.

4。 Rapid evacuation

in the application, must realize the extraction period for a few seconds, so operators must do before Paul, pump and pump for the ratio of 1, 2. Is very necessary to ensure that the ratio, because the former stage pump for 10000 mpa pressure pumping air, it occupied most of the pumping time. Roots pump, however, requires a minimum of 1000 mpa pressure can operate effectively. Therefore, the size of the backing pump must be bigger accordingly.

5。 Open pump

due to the rapid cooling, sudden intrusion liquid can damage the pump. The temperature needed for liquid gas cannot achieve evaporation. Additional steam can't pulls out, because before the pump overload, before class pressure could rise to high level. In order to prevent this happening, it is necessary between the processing chamber and roots pump installation receivers, to absorb before pump into the liquid.

6。 Liquid into

due to the rapid cooling, sudden intrusion liquid can damage the pump. The temperature needed for liquid gas cannot achieve evaporation. Additional steam can't pulls out, because before the pump overload, before class pressure could rise to high level. In order to prevent this happening, it is necessary between the processing chamber and roots pump installation receivers, to absorb before pump into the liquid.

7。 Dust accumulation

in the process of producing dust particles or carry, in metallurgy or crystal pulling process, for example, it is necessary at the entrance of the pump installation of dust filter to protect downstream of roots pump and pump. So-called fragments of the fence should be installed in the roots pump inlet port, this will prevent system used for the first time, because of improper cleaning, large amounts of solid material and weld bead spewing from the weld. In this case, it is recommended to use the pump manufacturer's accessories, because fragments fence design makes it free section in accordance with the nominal diameter of the pump. This ensures that the speed of the pump will not affected by the accident conductance losses.

8。 Critical gas extracting

extraction and high purity rare gases, like helium 3 or 4, helium must be avoided at all costs of these gases in contact with the ambient air. At this point, the pump body in less than 10 - 5 to 10 - 800 mpa liters per second area to have a higher air tightness and lower leakage rate. Vacuum provide permanent magnet motor coupling to replace ordinary axis feed through. This allows the shaft seal ring all leaks in history.

you can also use the enclosed machine. However, the operator must rely on the pump manufacturer for maintenance, because this type of enclosed machine was developed specifically for this pump. If you execute the magnetic coupling, can use the cost effective standard motor. Vacuum for double rotary vane vacuum pump with up to 250 cubic meters/hour traffic, provide up to 12000 cubic meters/hour for roots pump flow


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