Electric vacuum bell-type furnace sequiped with moving hearth bottom

Electric vacuum bell-type furnace sequiped with moving hearth bottom

Electric vacuum bell-type furnace sequiped with moving hearth bottom

This type of furnace is designed for processing large-sized products, putting and uoutputting of which is provided using special putting mechanisms, as well as for serial and large-scale production. 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. Two powerful screw lifts provide a smooth rise and lowering of the hearth bottom, without jerking vibration and jamming.

After lowering the hearth bottom, horizontal putting of the cage with products under the hood is possible, which is especially true for a large mass of parts. With this configuration, a phased installation of the batch is possible, which significantly increases the number of products. After putting, the batch with the details rises with the hearth bottom into the working area of the heating chamber.

As a rule, such furnaces are made with one-bell. Heating elements are often collapsible, assembled from bars of cylindrical section, from high-temperature alloys of resistance (nichrome, eurofechral, kanthal A1), molybdenum, tungsten. The location of the cap allows for convenient replacement of failed elements and maintenance, without disassembling the main cap. It is possible to install an all-welded heater of complex design made of tungsten or molybdenum. The large volume of the chamber allows the manufacture of furnaces of this design with multi-zone heating. Due to the collapsible design, such furnaces are convenient to transport and assemble at the place of operation.

Chamber quantity, items


Type of chambers

cylindrical, vertically oriented

Inner dimensions of chamber:

diameter, mm

height, mm



Operating temperature range in the heating chamber, oC:
control by thermocouples XA(K) or NN(N)

control by thermocouples PP(S) or PR(B)

control by thermocouples BP(A1) or BP(C)




Heating type


Permissible mass with parts, kg


Available oxygen removal methods

purging with nitrogen or inert gas, evacuation pumping, multi-stage

Range of heating / cooling speeds, ° C / min


Working gases

hydrogen, helium, nitrogen, argon, methane, formgas

Number of inputs for working gases


Available operations with working gases

mixing, moisturizing

Minimum percentage of each gas when mixed, %


Range of automatic adjustment of the flow rate of each gas, l / min


Ability to use as a vacuum or gas vacuum furnace


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


Stability of maintaining the operating temperature in the working area when controlling heating in automatic mode, ° C, not worse


Heaters power consumption, kVA


Total dimensions, mm, no more than:


width (depth)





Weight, kg, no more than



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