Vacuum pump periodically check the importance of the cooling water
|Because of the vacuum system requires large amounts of water for cooling. To conserve water, we generally use a closed-loop cooling water system to provide cooling water pump. In the run-time system, condenser and vacuum heat exchange tank at 100 ℃ temperature will reach even higher, mineral water, a chemical reaction will occur, especially in the south, water acidic and rich in minerals, easily in the vacuum cooling condenser cooling water chamber or fouling, resulting in deterioration of the cooling effect, resulting in high operating temperature vacuum pump, causing vacuum seal, bearing damage, and even lead to serious damage to the pump. So you must check the cooling water pump cooling water and regular water chamber.In front of the cooling water system should be linked to drug delivery patch test. Take the same material and water condenser and vacuum chamber sheets soaked in the medicine. After the allotted time, the corrosion of Pharmacy flake content according to national standard or industry standards were compared in order to determine the type and quantity of drug delivery.
Pump selection questions
The vacuum pump vacuum drying process as the key equipment should be chosen taking into account the type of pump is suitable for on-site production process. Power transformer drying process is actually a dehumidification process, pumping a lot of water vapor to be discharged, so choose before the pump must be able to withstand the relatively high water vapor partial pressure, such as the choice of rotary vane pump or water ring pumps. But generally large power transformers (voltage 110kV and above) in the ultimate degree of vacuum drying tank system requirements 1OPa, coupled with the level of the water pump booster Roots are far short of this requirement (not to mention also consider the system leakage).
At present, with the introduction of imported equipment in the single-stage rotary vane vacuum pump (with gas ballast valve) can reach the ultimate vacuum 50Pa (domestic single-stage rotary vane pumps can be achieved even 10pa, but the performance and import a certain gap), then Roots booster plus level, the vacuum can be increased to at least below 10Pa (considering the system leakage rate l0h pressure rise not more than 93Pa). So now transformer vacuum drying equipment tend to choose rotary vane vacuum pump as a preamp…
Meanwhile, pumping medium, mixed with a large amount of water, based on the saturated vapor pressure curve of water, when the pump temperature reached 60 ℃, the saturated vapor pressure, the water up to 19.8kPa, the partial pressure on the ultimate vacuum pump. If a gas ballast pump, it can suction steam, but its maximum inlet pressure (water vapor partial pressure) of the pump and pump-doped gas temperature related.
Under certain conditions the degree of vacuum, the higher the temperature, the more easily volatile water, liquefied to pump oil in the water is small. Therefore, let the pump run at a temperature as high as possible is to ensure that a vacuum pump to reduce pumping oil emulsion, an effective way to obtain high vacuum.