The vacuum system used for vacuum drying equipment often has the above-mentioned phenomenon that causes the damage of the vacuum pump. Because the purpose of vacuum drying is to remove water vapor. In addition, it is inevitable to bring in a lot of dust and granular impurities during the storage, transportation and manufacturing process of the dried material or product and the opening of the vacuum tank itself. When the vacuum system is in the high-pressure pumping stage, these impurities may be carried into the pump cavity of the vacuum pump by the turbulent airflow.

In order to avoid damage to the mechanical vacuum pump due to the above reasons, in addition to the requirement to clean the vacuum system as much as possible during the process, a filter can be installed at the air inlet of the vacuum pump to block impurities and dirt that may enter the pump cavity from the air inlet . A dirt trapping cavity is set at the air inlet of the pump to prevent dirt from entering the air inlet if the net of the pump inlet is damaged or other reasons, it can only fall in the dirt trapping cavity and not enter the vacuum pump Cavity.

In order to prevent the dust and particulate matter in the pump oil from entering the pump cavity together with the pump oil, for certain processes, a continuous pump oil filter device should be provided during the operation of the pump. After the dust, impurities and contaminated oil sink into the bottom of the main oil tank, it flows into the auxiliary tank through the oil return pipe. After separation and precipitation, the emulsified oil, water, dust and impurities sink into the bottom of the auxiliary tank and are periodically discharged by the drain valve, and relatively clean oil Then, it is filtered by a filter located in the upper part of the auxiliary oil tank, and then enters the oil distribution chamber through the oil inlet pipe and is supplied to the end cover and the pump chamber to work.

The filter element in the filter blocks mechanical contaminants when the oil passes, and purifies the pump oil. A pressure gauge is often set on the filter to show whether the filter is clogged. When the pressure increases and the oil cannot flow normally, the filter is clogged, and the filter element should be replaced or cleaned.

Rotary vane vacuum pumps generally check the oil level every week. The oil change interval depends on the working conditions. Generally, when the ultimate pressure of the pump rises due to poor oil lubrication, oil decomposition or too much pollutants, the oil needs to be replaced.