Vacuum dryers need improvement and innovation
The vacuum dryer is a vacuum low-temperature equipment for heating and drying materials. It can be vacuumed by a vacuum pump to make the working chamber in a vacuum state, thereby greatly increasing the drying rate of materials and saving energy. Vacuum dryers have many advantages and features, and have a wide range of applications in the pharmaceutical industry, and save a lot of energy for users. However, with the changes in market demand and the improvement of the technical level, there are still many problems to be solved in the vacuum dryer.
High equipment stability and extended service life
The vacuum dryer has a solid structure, stable and stable operation, and low resistance, so the bearing force at both ends is also small. “The bearings of the advanced vacuum dryer adopt the exposed design, which reduces the use of wearing parts, and there is no wearing parts in the drying chamber.†The vacuum dryer manufacturer introduces that the traditional equipment will bend under its own gravity and lose its concentricity. Degree, and after the problem with the roller bearing under the drying cylinder, the drying cylinder is easily separated from the roller. Once it falls, it is difficult to get the roller again due to its own weight.
However, the drying chamber of the new vacuum dryer is stationary, not rotating. The advanced production technology plus scientific material selection and rigorous quality requirements ensure the high quality and high sealing of the equipment, and the main body has almost no wearing parts. . “The stability of the static drying chamber is definitely better than the traditional rotating type. At the same time as saving electricity, the life is also extended.†Vacuum dryer manufacturers said.
Wide drying range and flexible installation
The advanced vacuum dryer can dry the raw material with the desired water content, and the moisture content of the finished dry material after drying can be adjusted to 5% water content by frequency conversion, which makes the drying range wide and the use range is wider.
Because some new vacuum dryers are small in size, short in length, light in weight, and more flexible and convenient to install, this also solves the problem of limited customer space, saves space for space use, and improves safety factor.
Although the advantages of vacuum dryers have greatly improved the efficiency of pharmaceutical production and saved energy, there are still many problems that should be discussed and resolved by the industry. The author has learned that the vacuum dryers commonly used in the market currently have the following defects, taking a square vacuum dryer as an example.
Uneven material drying
When the equipment is normally produced, according to the process setting time and temperature, when the certain time is reached, the upper and lower materials are not evenly dried. For example, when water vapor hits the inner wall of the tank, it is easy to appear condensation water on the tank wall. In particular, the water drops on the top plate are often dropped into the top material tray, which affects the dry quality of the material.
There is water at the bottom of the tank during the drying process.
The author has learned that when some vacuum drying ovens are running, due to the vacuum state inside the tank, it is impossible to carry negative pressure drainage. Some of the water at the bottom of the tank is re-evaporated twice, and some of them need to be discharged after shutdown, thus prolonging the heating time and affecting the product. quality.
Low drying efficiency
The water vapor evaporated from some vacuum drying oven materials moves by the pressure difference inside the tank formed after pumping. When the drying season is reached, the evaporation speed of the tank slows down due to the evaporation rate, and the water vapor accumulated in the upper layer of the material is further Affect the drying efficiency of materials.
No inert gas protection device
Some dry boxes are not designed with an inert gas protection device, and in order to prevent oxidation of the product in actual production, inert gas is required to protect it.
High equipment stability and extended service life
The vacuum dryer has a solid structure, stable and stable operation, and low resistance, so the bearing force at both ends is also small. “The bearings of the advanced vacuum dryer adopt the exposed design, which reduces the use of wearing parts, and there is no wearing parts in the drying chamber.†The vacuum dryer manufacturer introduces that the traditional equipment will bend under its own gravity and lose its concentricity. Degree, and after the problem with the roller bearing under the drying cylinder, the drying cylinder is easily separated from the roller. Once it falls, it is difficult to get the roller again due to its own weight.
However, the drying chamber of the new vacuum dryer is stationary, not rotating. The advanced production technology plus scientific material selection and rigorous quality requirements ensure the high quality and high sealing of the equipment, and the main body has almost no wearing parts. . “The stability of the static drying chamber is definitely better than the traditional rotating type. At the same time as saving electricity, the life is also extended.†Vacuum dryer manufacturers said.
Wide drying range and flexible installation
The advanced vacuum dryer can dry the raw material with the desired water content, and the moisture content of the finished dry material after drying can be adjusted to 5% water content by frequency conversion, which makes the drying range wide and the use range is wider.
Because some new vacuum dryers are small in size, short in length, light in weight, and more flexible and convenient to install, this also solves the problem of limited customer space, saves space for space use, and improves safety factor.
Although the advantages of vacuum dryers have greatly improved the efficiency of pharmaceutical production and saved energy, there are still many problems that should be discussed and resolved by the industry. The author has learned that the vacuum dryers commonly used in the market currently have the following defects, taking a square vacuum dryer as an example.
Uneven material drying
When the equipment is normally produced, according to the process setting time and temperature, when the certain time is reached, the upper and lower materials are not evenly dried. For example, when water vapor hits the inner wall of the tank, it is easy to appear condensation water on the tank wall. In particular, the water drops on the top plate are often dropped into the top material tray, which affects the dry quality of the material.
There is water at the bottom of the tank during the drying process.
The author has learned that when some vacuum drying ovens are running, due to the vacuum state inside the tank, it is impossible to carry negative pressure drainage. Some of the water at the bottom of the tank is re-evaporated twice, and some of them need to be discharged after shutdown, thus prolonging the heating time and affecting the product. quality.
Low drying efficiency
The water vapor evaporated from some vacuum drying oven materials moves by the pressure difference inside the tank formed after pumping. When the drying season is reached, the evaporation speed of the tank slows down due to the evaporation rate, and the water vapor accumulated in the upper layer of the material is further Affect the drying efficiency of materials.
No inert gas protection device
Some dry boxes are not designed with an inert gas protection device, and in order to prevent oxidation of the product in actual production, inert gas is required to protect it.
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