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Brief introduction of vacuum drying oven:
The vacuum drying box uses a vacuum pump to pump the space where the dry material is located to negative pressure, that is, the so-called vacuum state. In a vacuum state or a low-pressure state, the boiling point of the moisture, solvent, and other volatile components in the material decreases, so that it can be separated from the surface of the material particles and be pumped away by the vacuum pump at a lower temperature. It is mainly used in those materials that oxidize, polymerize and undergo other chemical reactions at high temperatures. Of course, it also has the dual effect of heating to accelerate the volatilization of moisture, solvent, and volatile components to separate from the surface of the material. The vacuum oven drying principle is specially designed for drying heat-sensitive, easily decomposable, and oxidizing substances, and can rush inert gas into the interior, especially some items with complex components that can also be quickly dried.
The vacuum drying oven china is an older drying device, and the inside of the box is divided into several layers by a heating plate. Hot water or low-pressure steam is introduced into the heating plate as a heating medium, the material tray with the medicine to be dried is placed on the heating plate, the door of vacuum drying oven is closed, and the inside of the box is evacuated by a vacuum pump. The heating plate heats the medicine to the specified temperature in the circulating flow of the heating medium, and the water starts to evaporate and gradually withdraw with the vacuum. This equipment is easy to control and can condense and recover the evaporated solvent. The medicine is not easily contaminated during the drying process. It can be used in medicine drying, packaging material sterilization, and heat treatment. In the 1980s, this equipment was often used as the main dryer in the API industry. However, due to the difficulty of online cleaning and online sterilization of the material tray, the drying speed was slow and the labor intensity of workers was high. After being mixed by the powder mixing device, it is rarely used in large-scale production of APIs.
Vacuum drying box structure:
1. The body of the vacuum drying box is made of high-quality cold-rolled steel plate, and the surface is electrostatic powder sprayed. The coating is hard and firm and has a tstrong anti-rust ability.
2. The studio is made of high-quality stainless steel, with rounded corners, smooth, smooth, and easy to clean.
3. Between the box and the studio, the ultra-fine glass wool insulation material is filled, which has a good thermal insulation function, effectively ensuring the stability and accuracy of the temperature in the box and the impact on the use environment.
4. The box door is a double-layer tempered glass structure, which can observe the heated items in the box and has a good heat insulation effect. It can effectively avoid burns to operators.
5. A heat-resistant rubber sealing ring is installed between the studio and the glass door to ensure a high degree of vacuum in vacuum oven drying principle.
6. The heater is installed on the outer surface of the studio to maximize the uniformity of the temperature in the box and facilitate indoor cleaning.
7. The temperature control is manufactured by microcomputer intelligent digital technology, with industrial PID, self-tuning and four-digit double, LED window indication functions, high-temperature control accuracy, strong anti-interference ability, and very convenient operation.
Principle of vacuum drying oven:
1. Vacuum program cycle control:
The overall vacuum drying process can provide a programmed vacuum cycle. You only need to set the vacuum time value, pressure holding time value, and air time value according to your requirements, and the drying time can be further shortened by the vacuum cycle. For example, setting the pumping time value Vacuum for 10 minutes, hold pressure for 30 minutes, and inflate for 2 minutes. This cycle is repeated 10 times. With the progress of each cycle, the humidity will continue to decrease, and the drying speed will be significantly accelerated. The maximum cycle can be 99 times. It is mainly suitable for drying with high moisture content. 's items.
2. Working process of vacuum drying oven:
First turn on the power of the vacuum drying box, connect the decompression end of the nitrogen bottle to the nitrogen port of the box, adjust the nitrogen inlet pressure and send the items to be dried into the workroom, close the box door and turn on the power switch, and press the control Start button on the panel
(1) Evacuate and heat at the same time
(2) After vacuuming to the set time, the vacuum pump stops working and nitrogen gas is automatically introduced
(3) Turn off the nitrogen after the nitrogen has been fed for the set time.
( 4) After holding the state for the set time, the vacuum pump restarts
( 5) After the set time, the vacuum pump and heater will automatically turn off
( 6) Manual pressure relief
Advantages of vacuum drying oven
The vacuum drying oven china is specially designed for drying heat-sensitive, easily decomposed, and easily oxidized substances, and can be filled with inert gas, especially some complex items that can also be dried quickly. Widely used in the pharmaceutical, electronic and chemical industries.
1. Compared with ordinary drying relying on air circulation, powder samples are not blown or moved by flowing air;
2. The vacuum environment greatly reduces the boiling point of the liquid to be driven off, so vacuum drying can be easily applied to heat-sensitive substances;
3. Safer to use - under vacuum or inert conditions, eliminate the possibility of thermal explosion of oxides;
4. Various mechanical parts or other porous samples with complex structures are cleaned and dried by vacuum drying, and no residual substances are left after they are completely dried;
5. For samples that are not easy to dry, such as powder or other granular samples, the vacuum drying method can effectively shrink;
6. The control characteristics of the vacuum drying box, with parameter memory protected due to power failure and data loss in crash state, and the function of recovery from incoming calls;
7. The temperature control sensor adopts the original imported components of capacitive type;
8. The studio of vacuum oven drying principle is a cuboid structure so that the effective volume can be reached, and the box door is made of the tempered, bulletproof double-layer glass door so that users can see the cultivated items in the observation studio at a glance;
9. The inner liner of vacuum drying oven is made of mirror stainless steel plate or brushed plate by argon arc welding, and the outer shell is made of high-quality cold-rolled steel plate electrostatically sprayed, with beautiful and novel appearance;
10. The complete tightness of the door of vacuum drying oven china can be adjusted by the user at will, and the integrally formed silicone rubber door seal has a high degree of vacuum in the box;
11. The temperature control system of vacuum drying oven adopts microcomputer single-chip technology, temperature control, timing, and over-temperature alarm;
12. It adopts the first domestic streamline arc design, the shell is made of cold-rolled steel plate, and the surface is electrostatically sprayed;
13. Imported motors and fan blades are used;
14. The display is a dual-screen high-brightness digital tube display, the display value is accurate and intuitive, the performance is superior, and the adjustment parameters are set by touch buttons;
15. The thermal insulation system uses ultra-fine glass fiber to fill the thermal insulation area, and the connection parts of the inner and outer bladders are made of non-metal high-temperature-resistant materials, which can effectively reduce the temperature conduction;
16. Storage, heating, testing, and drying are all carried out in an environment without oxygen, so it will not oxidize.
