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#1 2021-02-19 08:47:05

wyb2020
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What is the importance of cooling system of vacuum furnace

What is the importance of cooling system of vacuum furnace

Vacuum furnace is a kind of industrial furnace heated by electric heating elements in the near vacuum state. The cooling system of vacuum furnace is an important part of vacuum furnace. The cooling water path should be kept unobstructed, otherwise the water temperature will rise and cause shutdown. This problem is often ignored in the work of vacuum furnace. When no one manages it, it may cause great damage to the vacuum furnace.

After a long time of use, the molybdenum heating element of vacuum furnace will appear hardening, shrinkage, falling, first lodging lap, then fusing (melting) and other phenomena. In order to make the heating wire of vacuum furnace have necessary strength at high temperature and prevent hardening, collapse or sagging, the structure size of heating wire of vacuum furnace should be designed first, such as spiral resistance wire, and the bending diameter, pitch and pitch diameter of heating element should be paid attention to. The heating body is about to loosen up on the insulation lining of the vacuum furnace, and 95 ceramic parts are placed on the insulation lining to properly reserve its expansion space. It should be placed in a suitable position, generally 100-200 mm, and can be firmly hooked to prevent the resistance wire from lying on the ground. In addition, direct contact (short circuit) between furnace wires should be avoided. Generally, spacer should be padded.

The purpose of treating cooling water with the aid of biodegradation chemistry is to keep minerals in suspension, reduce the accumulation of sediment in rubber tube, serpentine tube and water jacket, and make the water flow smooth. This is usually done by an automatic device, which can monitor the conductivity of water, automatically replenish chemicals, wash the waterway and add fresh water. Combined with the auxiliary steam filtration system, this method can also ensure the pH control of the water and prevent the deposition of excess minerals in the cooling water system. After the system works stably, the water quality test should be conducted at least once a month to prevent over treatment or under treatment.

The test samples of vacuum tempering furnace shell and heat exchanger materials should also be put in the waterway system, and the weight loss inspection should be conducted once a year to check the treatment effect. Special attention must be paid to coil cooler of diffusion pump in high temperature vacuum furnace. It should be checked regularly. If it is blocked, the diffusion pump will overheat and lose its function, and further cause the heater of the diffusion pump to burn out, resulting in expensive and time-consuming repair. When the serpentine cooling water pipe is blocked, disconnect the water circuit from the water source, drain the water and blow it through with compressed air or flush it with dilute acetic acid solution.

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