A vacuum is a given space with a gas pressure below 101,325pa. In a vacuum, the pressure of the gas, the fineness is generally expressed in natural gas, the smaller the pressure value, the thinner the gas. There are many kinds of industrial vacuum pumps, pump performance test methods need to be tested.
For vacuum metallurgical equipment, the gas sources in the pre-extraction and hot-smelting of the cold furnace are as follows:
1. The atmosphere in the pumped space (related to the pumped volume),
2. The gases released during the process (including the gases generated and introduced, which are related to time, depression, pressure and production process),
3. Surface air release exposed in a vacuum (related to the type, surface area, time, temperature and pressure of materials, etc.)
4. Leakage and infiltration gas (related to leakage rate of system components, welding quality of equipment and static sealing components and structural materials);
5. Volatile gases (related to temperature and pressure) caused by the vapor pressure of materials.
In order to ensure the needs of the metallurgical process, the design of the vacuum system is according to the above the required pumping gas flow, to select the suitable vacuum components, pumps and valves, etc., and put forward reasonable layout scheme according to the extraction process, in order to achieve pumping gas is pumped space, overcome deflated and air leakage, make the vacuum degree necessary for the vacuum chamber have always been able to keep.
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