Vacuum ovens are becoming more and more widely used in our daily life. However, due to the negligence of the relevant personnel and their lack of understanding, there have been a series of problems in the process of use. Below are the vacuum drying ovens that often attend the issue and everyone. Discuss the analysis together.
If the vacuum oven is operated according to the procedure of first heating and then vacuuming, when the heated air is pumped out by the vacuum pump, the heat is inevitably brought to the vacuum pump, which causes the vacuum pump to rise too high, which may reduce the efficiency of the vacuum pump. The correct method of use should first vacuum and then heat up. After the rated temperature has been reached, if it is found that the degree of vacuum has decreased, then add it appropriately. This is advantageous for extending the life of the device.
In general, the electric vacuum drying oven adopts a method of heating the wall surface of the vacuum chamber first, and then heating the wall toward the workpiece. In this way, the temperature sensor of the temperature control meter can be arranged on the outside wall of the vacuum. The sensor can accept convection, conduction, and radiant heat simultaneously. The glass rod thermometer in the vacuum chamber can only receive radiant heat, and because the blackness of the glass rod cannot reach 1, a considerable part of the radiant heat is refracted, so the temperature value reflected by the glass rod thermometer is definitely lower than the temperature reading of the meter. . In general, it is normal to have a difference between the temperature reading of the meter and the reading of the glass rod thermometer within 30 °C at 200 °C. If the temperature sensor of the temperature control instrument is placed in the vacuum chamber, the difference between the temperature value of the glass rod thermometer and the temperature reading of the meter can be appropriately reduced, but it is impossible to eliminate, and the sealing reliability of the vacuum chamber increases a possible unreliable link. . If you do not want to see this difference from the practical point of view, you can use the display correction function unique to the temperature control instrument.
Vacuum ovens are essentially for people's convenience and better life, but if there are problems due to improper operation, it will also have a negative impact on our work and life. Therefore, in the normal basic operation, we You should follow the rules, be careful and safe to use, and try to make it work for our lives for a longer period of time.
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