Production of Class 100/Class 1000/Class 1000 dust-free ovens, secondary vulcanization ovens, PCB ovens, single door ovens, two door ovens (divided into single control and independent control), four door ovens (divided into single control and independent control), anti magnetic and anti radiation ovens, anti oxidation ovens, explosion-proof ovens, high-temperature ovensVacuum oven (vacuum oven/vacuum oven/vacuum defoamer/vacuum drying oven/vacuum leak detection oven/simulated negative pressure testing machine/defoamer)Muffle furnace, high-temperature furnace, constant temperature and humidity testing machine, thermal shock testing machine, etc.

Vacuum oven/Vacuum drying oven/Vacuum defoamer/Vacuum drying oven/Vacuum leak detection box/simulated negative pressure testing machine/Defoamer)broadWidely used in research and application fields such as biochemistry, chemical pharmaceuticals, healthcare, agricultural research, environmental protection, etc., for powder drying, baking, and disinfection and sterilization of various glass containers. It is particularly suitable for rapid drying and product dehydration and delamination of heat sensitive, easily decomposable, easily oxidizable substances and complex components.

Vacuum oven/Vacuum drying oven/Vacuum defoamer/Vacuum drying oven/Vacuum leak detection box/simulated negative pressure testing machine/Defoamer)It is a box type drying equipment that dries dry materials under negative pressure conditions. Its working principle is to use a vacuum pump to extract air and moisture, creating a vacuum state in the working chamber, reducing the boiling point of water, and accelerating the drying speed.

Vacuum oven/Vacuum oven/Vacuum defoamer/Vacuum drying oven Product features

Precautions for Vacuum Oven/Vacuum Oven/Vacuum Defoamer Box/Vacuum Drying Box

1. The vacuum box should be used in an environment with a relative humidity of ≤ 85% RH, no corrosive gases, no strong vibration sources, and no strong electromagnetic fields around it.

2. The outer shell of the vacuum box must be effectively grounded to ensure safe use.

3. The vacuum chamber has no explosion-proof or anti-corrosion treatment, and does not dry items that are flammable, explosive, or prone to producing corrosive gases. If there are items with corrosive gases, they need to be explained in advance so that they can be made of special corrosion-resistant materials.

4. The vacuum pump cannot work for a long time. Therefore, when the vacuum degree reaches the requirement for drying the item, the vacuum valve should be closed first, and then the power supply of the vacuum pump should be turned off. When the vacuum degree is lower than the requirement for drying the item, the vacuum valve and power supply of the vacuum pump should be opened again to continue vacuuming. This can extend the service life of the vacuum pump. It can also be controlled by an automatic interlocking device. When the required vacuum degree is reached, it will automatically stop, and when it is lower than the required vacuum degree, it will automatically start vacuuming.

5. If dry items are damp, it is best to add a filter between the vacuum box and the vacuum pump to prevent damp gases from entering the vacuum pump and causing it to malfunction.

6. If dried items become lightweight and small in size (in small particles) after drying, a barrier net should be added to the vacuum port in the working room to prevent damage to the vacuum pump (or solenoid valve) caused by the inhalation of dry materials.

7. After multiple uses, the vacuum box may not be able to evacuate. In this case, the door seal should be replaced or the extension distance of the door latch on the box should be adjusted to solve the problem.

8. The vacuum box should be kept clean regularly. The door glass should not be wiped with reactive chemical solutions. Instead, it should be wiped with a soft cotton cloth. Sharp objects should not be used to paint tempered glass windows.

If the vacuum box is not used for a long time, wipe off the exposed plated parts and apply neutral grease to prevent corrosion. Cover them with a plastic film dust cover and place them in a dry room to prevent electrical components from being damaged by moisture and affecting use.

When the vacuum box does not require continuous pumping, the vacuum valve should be closed first, and then the power supply of the vacuum pump should be turned off. Otherwise, the vacuum pump oil will flow back into the box. Special valves can also be configured to prevent the vacuum oil from flowing back

If the humidity of the dry material in the studio is high, the generated water vapor will affect the performance of the vacuum pump. It is recommended to install a "drying/filter" between the drying oven and the vacuum pump.

If it is necessary to add inert gases such as nitrogen during the drying process, it should be specified in the contract and an additional intake valve should be added.

Maintenance and upkeep of vacuum oven/vacuum oven/vacuum defoamer/vacuum drying oven

1. Regularly check the oil quality and replace it with new oil if it deteriorates to ensure the normal operation of the vacuum pump. Regularly check the oil level position and adjust it to meet the requirements if it does not meet the regulations.When the vacuum pump is running, the oil level should be at the center of the oil gauge.

2. The oil change period shall be determined by the user at their discretion, taking into account the actual environmental conditions and whether the performance requirements can be met. It is recommended to change the oil of a new vacuum pump after about 100 hours of operation when removing clean and dry gases. After the black metal powder is no longer visible in the oil, the oil change period can be extended appropriately in the future.

3. In general, after 2000 hours of operation, the vacuum pump should be inspected for aging of the sealing components, cracking of the exhaust valve plate, and cleaning of any dirt deposited on the valve plate and exhaust valve seat. Clean all parts inside the vacuum pump chamber, such as rotors, rotors, springs, etc. Usually cleaned with gasoline and dried. After cleaning the rubber parts, dry them with a dry cloth. When cleaning and assembling, handle with care to avoid injury.

4. Conditional cleaning should also be carried out in the pipeline to ensure smooth flow.

5. After reassembly, a trial run should be conducted, generally requiring 2 hours of idle operation and a second oil change. This is because there may be a certain amount of volatile substances left in the vacuum pump during cleaning. After normal operation, it can be put back into normal work.

6. Check for any looseness in the vacuum pump piping and joints. Rotate the vacuum pump by hand to see if it is flexible.

7. Tap the motor and try to see if the motor direction is correct.

8. Start the motor, and when the vacuum pump is running normally, open the outlet pressure gauge and the inlet vacuum pump. After the appropriate pressure is displayed, gradually open the gate valve and check the motor load.

9. Try to control the flow rate and head of the vacuum pump within the range indicated on the label to ensure that the vacuum pump operates at its highest efficiency point, in order to achieve maximum energy-saving effect.

10. During the operation of the vacuum pump, the bearing temperature should not exceed 35C of the ambient temperature, and the maximum temperature should not exceed 80C.

11. If any abnormal sound is found in the vacuum pump, it should be stopped immediately to check the cause.

12. When the vacuum pump needs to be stopped, first close the gate valve and pressure gauge, and then stop the motor.

13. The lubricating oil of the vacuum pump should be changed after 100 hours of operation within the first month, and then every 500 hours thereafter.

14. Regularly adjust the packing gland to ensure normal dripping inside the packing chamber (preferably in droplets).

15. Regularly check the wear of the shaft sleeve, and replace it promptly if there is significant wear.

16. When using a vacuum pump in the cold winter season, after parking, it is necessary to unscrew the drain plug at the bottom of the pump body to drain the medium completely. Prevent frost cracking.

17. If the vacuum pump is not in use for a long time, it is necessary to disassemble the entire pump, dry off the water, apply grease to the rotating parts and joints, and store them properly.

Principle Editor

1. The reason for the difference between the instrument reading of the vacuum drying oven and the reading of the glass rod thermometer in the vacuum chamber is:

The general electric vacuum drying oven adopts the method of heating the vacuum chamber wall first, and then radiating heating from the wall to the workpiece. In this way, the temperature sensor of the temperature control instrument can be arranged on the outer wall of the vacuum chamber. Sensors can simultaneously receive convection, conduction, and radiation heat. The glass rod thermometer in the vacuum chamber can only accept radiant heat, and because the blackness of the glass rod cannot reach 1, a considerable part of the radiant heat is refracted. Therefore, the temperature value reflected by the glass rod thermometer is definitely lower than the temperature reading of the instrument. Generally speaking, it is normal for the temperature reading of the instrument to differ from the reading of the glass rod thermometer by less than 30 ℃ under the working condition of 200 ℃. If the temperature sensor of the temperature control instrument is arranged in the vacuum chamber, the difference between the temperature value of the glass rod thermometer and the temperature reading of the instrument can be appropriately reduced, but it cannot be eliminated, and the sealing reliability of the vacuum chamber increases a potentially unreliable link. If you don't want to see this difference from a practical perspective, you can use the display correction function unique to temperature control instruments to solve it.

2. The reason for first vacuuming and then heating up the vacuum drying oven

1) The purpose of placing the workpiece in a vacuum box for vacuuming is to remove any gas components that can be extracted from the material of the workpiece. If the workpiece is heated first, the gas will expand when exposed to heat. Due to the excellent sealing of the vacuum box, the enormous pressure generated by the expanding gas may cause the tempered glass of the observation window to burst. This is a potential danger. By following the procedure of vacuuming first and then heating up, this danger can be avoided.

2) If the procedure of heating up first and then vacuuming is followed, when the heated air is pumped out by the vacuum pump, the heat will inevitably be carried to the vacuum pump, resulting in a high temperature rise of the vacuum pump and a possible decrease in its efficiency.

3) The heated gas is directed towards the vacuum pressure gauge, which will generate a temperature rise. If the temperature rise exceeds the specified operating temperature range of the vacuum pressure gauge, it may cause indication errors in the vacuum pressure gauge.

The correct usage method should first evacuate and then heat up. When the rated temperature is reached and the vacuum degree is found to have decreased, add some more suction appropriately. This is beneficial for extending the service life of the equipment.

3. The reason why the vacuum drying oven does not have a temperature uniformity parameter

General electric (blast) drying ovens are equipped with temperature uniformity parameters: natural convection drying ovens have a working temperature limit of 3%, while forced convection drying ovens have a working temperature limit of 2.5%. Only the electric vacuum drying oven does not have a temperature uniformity parameter, because the possibility of achieving uniform temperature in the working chamber through the movement of gas molecules in the vacuum drying oven is almost non-existent. Therefore, conceptually, we can no longer apply the temperature uniformity defined by the usual electric (blast) drying oven to the vacuum drying oven. Setting this indicator under vacuum conditions is also meaningless. The amount of thermal radiation is inversely proportional to the square of the distance. The radiation heat received by the same object at a distance of 20cm from the heating wall is only 1/4 of that at a distance of 10cm from the heating wall. The difference is significant. This phenomenon is similar to the fact that in winter, when exposed to the sun, the side that is exposed to the sun is very warm, while the side that is not exposed to the sun is relatively cold. Due to the difficulty in achieving uniform and consistent radiation heat at various points in the three-dimensional space of the working chamber in the structure of the vacuum drying oven, and the lack of authoritative evaluation methods, this may be the reason why the temperature uniformity parameter is not included in the standard for electric vacuum drying ovens. [3] Quality Identification Editor

Firstly, structurally speaking, the shell of a typical drying oven is made of cold-rolled steel plates, but there is a significant difference in thickness. Due to the vacuum environment inside the vacuum drying oven, in order to prevent the box from being damaged by atmospheric pressure, the thickness of the outer shell should be slightly larger than that of the blast drying oven. Generally, thicker steel plates are chosen for better quality and longer service life.

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