vacuum unit equipment in light oil metallurgic requirements

The process of obtaining vacuum in a vacuum system is called vacuum pumping, also known as pumping or exhausting. Under the regular air pressure, the volume of gas pumped out per unit time is called pumping rate, i.e. pumping speed. It can also be called pump speed. The unit is L / s. The pressure that a pump or a vacuum system can reach after a satisfactory exhaust time is called the limiting vacuum degree

High vacuum condition is required for the metal metallurgy of thin oil. Therefore, the complete set of high vacuum units equipped with mechanical pump and diffusion pump is often used. The vacuum can be pumped up to 10-6pa by using mechanical pump and booster pump in series. To further advance the vacuum degree, adsorbent or cold trap of equipment can be put into the operation system to absorb or condense the gas which has not been pumped away by the pump. Sometimes, one-stage mechanical booster pump and unit are added Series or parallel connection, once into a certain vacuum scale of pumping ability.

In high vacuum unit. Mechanical pump can make the air pressure from an atmospheric pressure start to become smaller, called the front stage pump; diffusion pump can only pump from lower air pressure to lower pressure, called secondary pump. The air pressure at the beginning of secondary pump operation is called preparation vacuum or pre vacuum. The pumping speed of each kind of vacuum pump is corresponding to a certain inlet pressure. Therefore, it is necessary to reasonably match the vacuum unit to obtain the vacuum benefits. An unreasonable equipment will not only constitute a waste, but also lead to the vacuum degree of the empty system can not meet the expected requirements.

The reasonable equipment of vacuum unit should deal with the following problems

1. Select the type of main pump, recognize the pipeline and select the vacuum components according to the requirements of the gas quantity, working pressure, limit of its emptiness and pumping time;

2. After the main pump is selected, calculate the pumping time and pressure of the vacuum equipment;

3. Understand the basic parameters and pipes of vacuum pump