The nitrogen-filled oven is also equipped with a nitrogen pipeline system, which can be filled with an inert gas such as nitrogen, dry air or argon to form an anaerobic and oxygen-free oven in the tank. From the appearance point of view, the nitrogen-filled oven and the hot air circulation oven are roughly The same, so many people think that the nitrogen-filled oven is added to the tube on the basis of the hot air circulation oven, the flow meter, but it is not the case, the two have a big difference in the specific manufacturing process.
1. The filling process of the nitrogen-filled oven and the hot air circulation oven is different. The nitrogen consumption of the nitrogen-filled oven itself is very large. Generally, the normal nitrogen consumption per hour is 3-4 times of the volume of the chamber working chamber. In order to maximize the nitrogen consumption, the liner of the nitrogen-filled oven must be fully welded. High temperature sealing treatment, try to minimize the leakage, of course, can not completely avoid leakage, after all, the sealing gap with the vacuum oven is far away, but the sealing performance of the general nitrogen cabinet is not weak. The inner liner of the hot air circulation oven is generally spliced. Even if it is a welded inner tank, it is only spot welding, and it will not be fully welded. When it comes to full welding, we may not know very well. In this way, spot welding is a distance argon arc. Solder joint 2, and full soldering is from the head to the tail, for example, the sink must be fully welded to not leak water, and spot welding is sure to leak water. In addition, the high temperature seal is welded, and the weld seam is coated with high temperature resistance. Sealant, which acts as a secondary seal. Another advantage of this approach is that after filling with nitrogen, it can not only achieve an oxygen-free environment (oxygen content "2000ppm", but also ensure a relatively clean internal environment, because the insulation between the inner liner and the outer casing cannot Infiltrates into the liner and causes pollution to the inside.
2. The difference between the air inlet system and the exhaust system of the nitrogen-filled oven and the hot air circulation oven. The nitrogen-filled oven has no air inlet system, only one nitrogen gas inlet is used as the fresh air source, and the hot air circulation oven has a special air inlet. In terms of exhaust air, the exhaust air of the nitrogen-filled oven must be adjustable if the baking process If there is no pollution or odor, the exhaust vent can be completely closed, and if the hot air circulation oven closes the vent, the air volume is reduced, which will affect the internal temperature uniformity.
3. The nitrogen pipeline of the nitrogen-filled oven is a seamless welded pipeline, not a common pipeline, because the seamless welded pipeline has certain pressure and explosion-proof performance, and can withstand high temperature, and ordinary pipeline sealing and high temperature resistance They are greatly discounted. In addition, the nitrogen pipe will be equipped with a nitrogen pressure regulating valve in the front section of the nitrogen pipeline. The filtering device and the nitrogen flowmeter used are all required to withstand high temperatures to prevent cracking and bursting of the high temperature impact.
The above is the difference between the nitrogen-filled oven and the hot-air circulation oven. From the above points, the nitrogen-filled oven and the hot-air circulation oven are two distinct products, and the manufacturing cost of the nitrogen-filled oven is higher than that of the hot-air circulation oven.
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