The so-called vacuum drying refers to the technology of heating and drying the material to be dried under vacuum conditions. Vacuum drying equipment can be used for low-temperature drying of thermosensitive materials that are prone to decomposition, polymerization, and deterioration at high temperatures. It is widely used in industries such as pharmaceuticals, chemicals, and food electronics, and has the characteristics of fast drying speed and no damage to the internal quality of the dried items.
Compared with conventional dryers, vacuum drying ovens greatly reduce the boiling point of liquids that need to be removed, making them easy to apply to thermosensitive substances.
Meanwhile, for samples that are not easily dried, such as powders or other granular samples, vacuum drying can effectively shorten the drying time, and compared with ordinary drying relying on air circulation, powdered samples will not be blown or moved by flowing air.
Additionally, using a vacuum dryer is safer. Because vacuum dryers can eliminate the possibility of oxides exploding when exposed to heat under vacuum or inert conditions.
Due to the prominent advantages of vacuum drying ovens, there is a strong demand in the market. The market size of vacuum drying ovens continues to expand, and industry competition is becoming increasingly fierce, driving continuous innovation and development of drying technology.
Among them, microwave vacuum drying oven has become the "darling" in the market. It is understood that the microwave source technology of the microwave vacuum drying oven can ensure 24-hour continuous operation of the system. Among them, the magnetron is a specially designed industrial grade water-cooled device with a longer service life, which can be equipped with a specially customized high-power high-voltage transformer and has stable performance.
In addition, the microwave vacuum drying oven can reasonably arrange the microwave feed inlet according to the material dehydration process curve, achieving effective dehydration while minimizing the temperature of the material, thereby improving energy utilization efficiency. At the same time, a better combination of parameters such as material and temperature, air intake and exhaust volume, microwave power, etc. can be set based on the air saturation curve and dehydration process curve to improve the utilization rate of microwave energy and ensure dehydration efficiency.
It is worth noting that current users not only value the power size of the device, but also the design of the device structure. Some users have reported that most manufacturers' microwave vacuum equipment on the market has a flat top (except for the suspended basket structure), and during the drying process, steam condenses at the top and drips into the material on the upper tray, which can easily lead to uneven drying.
Secondly, many users have reported that the bottom of the microwave vacuum dryer purchased in the early stage has serious water accumulation, and the drying process needs to be stopped in the middle to eliminate the water accumulation before continuing to dry. This structural design obviously cannot meet the needs of users.
Therefore, the microwave vacuum dryer needs to upgrade its technology based on the actual user operation process. For example, in response to uneven drying, some microwave vacuum drying oven manufacturers use their company's new technology to adopt a large-area energy feeding method for the equipment, which can ensure that the microwave field is evenly and reasonably distributed, improve the efficiency of microwave energy utilization, and avoid the occurrence of local hotspots and splashing phenomena. At the same time, it can significantly reduce damage to the magnetron.
In terms of structure, some manufacturers adopt a "herringbone" shaped ceiling design at the top, which allows a large number of water droplets to slide off the front and rear wall panels.
In the process of large-scale microwave vacuum drying, the material has a fast water outlet speed, and the water is concentrated on the floor of the inner box and cannot be discharged, and it is not evaporated for a long time, which greatly prolongs the heating time. Therefore, we have designed a concave bottom structure for the box and assembled a large capacity water collection and drainage tank to ensure that the accumulated water can flow smoothly into the water collection tank, ensuring that the water collection tank has sufficient volume to meet the collection and discharge of all accumulated water during the drying process, shortening a lot of drying time and saving a lot of production costs.