Vacuum furnace refers to an industrial furnace heated by electrothermal elements in the near vacuum state. The cooling system of vacuum furnace is an important part of vacuum furnace. Cooling water should be kept clear, otherwise the water temperature will rise and cause shutdown. This is often neglected in the operation of vacuum furnaces. When unmanned, it may lead to significant destruction of vacuum furnaces.
The molybdenum heater in vacuum furnace will harden, shrink, fall, first fall over, then melt. In order to prevent hardening, collapse or sagging of vacuum furnace heating wire at high temperature, the structural dimensions of vacuum furnace heating wire, such as spiral resistance wire, bending diameter of heating element, pitch and spiral diameter, should be designed first. The heater is about to loosen by vacuum furnace insulation lining. 95 ceramics are put on the insulation lining, leaving proper expansion space. The shelf position should be suitable, usually 100 to 200 mm, and can be firmly hooked to prevent the resistance wire from lying on. In addition, direct contact (short circuit) between the furnace wires should be avoided, and isolators should generally be gasketed.
The purpose of treating cooling water by chemical assistant method of biodegradation is to keep minerals in suspension state and reduce the accumulation of sediments in rubber pipes, snake pipes and water jackets so as to make the water flow smoothly. This is usually accomplished by an automatic device, which can monitor the conductivity of water, automatically supplement chemicals, flush water and add fresh water. With the auxiliary steam filtration system, this method can also ensure the pH control of water and prevent the deposition of excess minerals in the cooling water system. After the system is stable, water quality tests should be conducted at least once a month to prevent overtreatment or inappropriate treatment.
The test samples of vacuum tempering furnace shell and heat exchanger material should also be placed in the water system, and the weight loss test should be done once a year to check the treatment effect. Special attention must be paid to the serpentine tube cooler of the diffusion pump. They should be checked regularly. If blocked, the diffuser pump will overheat and lose its function, and further cause the diffuser heater to burn down, resulting in expensive and time-consuming repair. When the serpentine cooling pipe is blocked, the water channel is disconnected from the water source, and the drainage is blown through with compressed air or washed with dilute acetic acid solution.
vacuum-furnaces-graphite-components
Heat-Treatment-Technology-of-Dies-and-Moulds
Low-Tempering-Process
Vacuum-Tempering-Furnace-Classification
没有评论:
发表评论