Vacuum pump mechanical selection

When choosing the type of vacuum pump, it should be selected according to the power, including the power of the motor and the shaft power of the pump shaft. As long as the power of the vacuum pump meets the needs of the boiler, it can ensure normal operation. However, when the pump is running, it is impossible for the power to become useful work. During this period, a certain share of power must be lost. Consider it.

This article contains the following:

Vacuum pump mechanical selection

corrosion

Vacuum pump maintenance

1.Vacuum pump mechanical selection

The role of the vacuum pump is to remove gas molecules from the vacuum chamber, reduce the gas pressure in the vacuum chamber, and make it reach the required vacuum degree. Broadly speaking, there is a large range from the atmosphere to the extremely high vacuum. So far, no vacuum system can cover this range. Therefore, in order to meet the process specifications, working efficiency and working life requirements of different products, different vacuum sections need to choose different vacuum system configurations. In order to achieve the best configuration, the following points should be considered when choosing a vacuum system:

First of all, it is necessary to check and determine the vacuum required by each process. Because each process has its own vacuum range, it must be carefully studied to determine.

Check the ultimate vacuum degree of the vacuum pump system on the basis of determining the vacuum degree required by the process, because the ultimate vacuum degree of the system determines the optimal working vacuum degree of the system. In general, the ultimate vacuum of the system is 20% lower than the working vacuum of the system and 50% lower than the ultimate vacuum of the foreline pump.

Check to determine the type and amount of extraction required by the process. Because if the type of gas being pumped reacts with the liquid in the pump, the pump system will be contaminated. At the same time, consideration must be given to determine the appropriate exhaust time and the amount of gas generated during the pumping process.

Check to determine the time required to achieve the required vacuum, the flow resistance and leakage of the vacuum pipeline. Consider the pumping rate required to maintain the vacuum under certain process requirements after reaching the required vacuum.

s=2.303 (v/t) lg(p1/p2)

among them:

s is the pumping rate of vacuum pump (l/s)

v is the volume of the vacuum chamber (l)

t is the time required to reach the required vacuum (s)

p1 is the air pressure in the initial container

p2 is the air pressure in the container after pumping

Influence factor

It determines the size of the product. The higher the pumping capacity request, the larger the product volume, and the higher the motor power required.

It is to decide what kind of structure the product adopts, the vacuum degree has two readings of gauge pressure and absolute pressure. Absolute pressure means that the reading is an absolute value, that is, the closer the reading is to '0\', the higher the vacuum. But on the other hand, the closer the gauge pressure is to 760mmHɡ, the higher the vacuum. If the absolute pressure (limit vacuum) you request is close to ‘0\’, then only the vacuum pump can meet this demand.

2.corrosion

The forms of vacuum pump corrosion can be divided into two categories: general (uniform) corrosion and local corrosion. The former occurs more uniformly on the entire surface of the vacuum pump, while the latter only occurs locally, such as pitting corrosion, crevice corrosion, intercrystalline corrosion, stress corrosion . The polymer composite material is used for anti-corrosion of the surface organic coating of the vacuum pump. It has good chemical resistance, excellent mechanical properties and adhesion performance. Compared with the traditional pressure vessel welding repair, it has simple construction, low cost and safe performance , Good repair effect.

3.Vacuum pump maintenance

The quality of the vacuum pump depends on its mechanical structure and oil quality. It must be protected when using the vacuum pump. If distilling a more volatile organic solvent, the organic solvent will be absorbed by the oil, which increases the vapor pressure, which reduces the evacuation efficiency. If it is acid gas, it will corrode the oil pump, if it is water vapor, it will make the oil into milk The vacuum pump is damaged due to turbid liquid.

If you want to buy vacuum pumps, please contact SUOTO PUMP.