Small-size electric vacuum bell-type furnaces equiped with moving hearth bottom
This type of furnace is designed for precision processing of small batches of products, products of non-standard shapes, as well as for laboratory and scientific research. A structural feature of this type of furnace is a fixed bell, inside of which screen insulation and a heating unit are fixed on the walls and the cover of the hood. A special hearth movement mechanism provides a smooth rise and lowering of the hearth, without jerking vibration and jamming.
After lowering the hearth bottom, horizontal putting of the batch with products under the hood is possible at a level convenient for the operator, which provides additional control and increases safety during operation. After inputting, the batch with the details rises with the hearth bottom into the working area of the heating chamber.
Such furnaces are made one-bell type. Heating elements can be of a cylindrical and strip type, from high-temperature resistance alloys (nichrome, eurofechral, kanthal A1), molybdenum, tungsten, tungsten-rhenium alloy. It is possible to create a furnace with a precision atmosphere, suitable for high-precision and extremely clean processes. Often, these furnaces are made in a modular design.
| Chamber quantity, items |
1 |
| Type of chambers |
cylindrical, vertically oriented |
|
Inner dimensions of chamber: diameter, mm height, mm |
60-250 80-450 |
|
Operating temperature range in the heating chamber, оС: control thermocouples ХА (K) or НН (N) control thermocouples PP (S) or PR (B) control thermocouples BP (A1) or BP (C) control with a wide-range pyrometer |
50-1250 50-1600 600-2200 1300-2500 |
| Heating type |
resistive |
| Permissible mass with parts, kg |
1-20 |
| Available oxygen removal methods |
purging with nitrogen or inert gas, evacuation pumping, multi-stage |
| Range of heating / cooling speeds, ° C / min |
3-25 |
| Working gases |
hydrogen, helium, nitrogen, argon, methane, formgas |
| Number of inputs for working gases |
2-6 |
| Available operations with working gases |
mixing, moisturizing |
| Minimum percentage of each gas when mixed, % |
5 |
| Range of automatic adjustment of the flow rate of each gas, l / min |
25-60 |
| Ability to use as a vacuum or gas vacuum furnace |
yes |
| Types of pumping systems |
oil (rotary vane + diffusion pumps), oil-free (dry scroll + turbomolecular pumps) |
| The uniformity of temperature in the working space without loading the electric furnace with automatic control of maintaining the temperature in the steady state, ° C, is not worse |
±5±0,003t |
| Stability of maintaining the operating temperature in the working area when controlling heating in automatic mode, ° C, not worse |
±2±0,0015t |
| Heaters power consumption,kVA |
20-50 |
|
Total dimensions, mm, no more than: length width (depth) height |
2200 1800 2400 |
| Weight, kg, no more than |
2850 |
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