Vacuum drying device and vacuum drying control method

Abstract

The invention discloses a vacuum drying device and a vacuum drying control method. The vacuum drying control method comprises the following steps: an object to be dried is placed into a closed drying chamber, and the drying chamber is heated; a vacuum pump with a gas ballast valve which is communicated with the drying chamber is started to pump the air inside the drying chamber, and the air inside the drying chamber enters the vacuum pump with the air ballast valve after being heated by a heating tube; a pressure gauge continuously monitors air pressure of the drying chamber, and an air pressure signal is transmitted to a microprocessor; and the microprocessor judges whether the object to be dried stays at a drying status according to the gas pressure change of the drying chamber. By adoption of the technical scheme, the object to be dried can be accurately dried, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of vacuum drying, in particular to a vacuum drying equipment and a control method. Background technique [0002] Vacuum drying utilizes the characteristic that the boiling point of liquid (water, chemical or biological solvent) decreases under low pressure, and can dry the object to be dried at room temperature or low temperature. Vacuum drying does not destroy the physical, biological and chemical properties of the material to be dried, and is widely used in various industries. In the vacuum drying process, how to perceive the drying state of the object to be dried and thus control the drying process is an important factor. The most common method of controlling the drying process is timing, that is, setting the time required for the drying process of the object to be dried according to experience. The disadvantage of this method is that the timing is inaccurate. If the timing is too short, the drying proc...

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Problems solved by technology

[0006] However, the use of a condenser has the following disadvantages, one is to increase the cost; the other is to complicate the manufacture and maintenance of vacuum drying equipment, because the vacuum of the condenser must be guaranteed, otherwise the vacuum of the system will be destroyed; the third is condensation in the condenser When the moisture reaches a certain amount, if the cooling source does not have enough instantaneous power to hold the liquid water at a low enough temperature, the condensed water will re-evaporate under vacuum, which not only delays the drying time of the sample, but also causes the water vapor It will enter the vacuum pump, and the purpose of protecting the vacuum pump cannot be achieved; Fourth, after adding the condenser, the user should often dry the moisture in the condenser, which is inconvenient to use

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