vacuum gas quenching furnace Internal structure

The vacuum gas quenching furnace mainframe is a horizontal and double chamber structure. The front chamber of the furnace body is a cooling chamber, the middle is a vacuum sealed and insulated gate valve, the rear chamber is a heating chamber, and the front and rear chambers have a furnace cover.

1. The vacuum gas quenching furnace body and the furnace cover are double-walled water-cooled structures. The inner and outer walls of the furnace are made of carbon steel plate, and the two ends are welded to the flange, and the cooling water is passed through. The intermediate gate valve body is provided with cooling water and is equipped with a high temperature resistant sealing ring. The sealing ring is not baked at a high temperature in the heating chamber with the movement of the valve plate, and has a long service life and is convenient to replace at the same time.

2. The heating chamber (furnace) is composed of a heat insulating layer, a heating element and a material table.

The heat insulation layer is a circular structure composed of graphite fiber felt. The heat insulation layer is fixed on the chamber frame composed of the porous steel mesh and the angle steel ring; the heat insulation layer of the gate valve is fixed on the valve plate and can move with the valve plate.


The heating element adopts a graphite tube, and the heating element is evenly arranged along the circumferential direction of the inner wall of the heat insulating layer, and the furnace temperature is uniform and convenient to replace.

The table consists of a graphite column, a graphite hearth and an AL2O3 spacer on the hearth. This structure prevents the bonding of the tray and the graphite hearth at high temperatures.

3. The plug-in type intermediate gate valve is a composite structure with heat insulation and sealing. The four-bar linkage mechanism makes the heat insulation and vacuum sealing safe and reliable, and the inclined surface guide makes the gate valve operate smoothly and without vibration.

4. The front chamber is a cooling chamber, which can be oil quenched and air cooled. The upper part is a gas quenching chamber equipped with an air cooling system; the lower part is an oil quenching chamber, equipped with a lifting mechanism, an inlet and outlet mechanism, an oil stirring device and an oil heating device.

Air cooling system: The vacuum gas quenching furnace is composed of a high speed fan, a heat exchanger and a flow guiding device. When air-cooled, it is filled with high-purity nitrogen or high-purity argon gas, and a forced convection cycle is formed under the driving of a high-speed fan to achieve rapid air cooling of the workpiece.

Lifting mechanism: driven by a three-speed gear motor outside the vacuum gas quenching furnace, the lifting and lowering truck is driven by a screw and nut mechanism. The lift truck has three speeds, and the slow speed is adopted when feeding the material. When the oil is quenched, the slow start, the fast oil input and the slow speed are used.

Inlet and discharge mechanism: the motor reducer drives the sprocket to drive the chain inside the furnace, and the chain with the tensioning mechanism is equipped with a lever to drive the feeding of the feeding trolley.

Oil mixing system: The motor reducer drives the agitator below the material truck. The deflector can promote the reasonable circulation of the vacuum quenching oil and improve the cooling capacity of the quenching oil. The agitator is a standard part with low noise and high efficiency.

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