Nozzle cooling vacuum gas quenching furnace capable of convection heating

Abstract

The invention discloses a nozzle cooling vacuum gas-quenching furnace which can perform convection heating, wherein, a furnace body is axially parallel to the ground, and an automatic control system is adopted. The nozzle cooling vacuum gas-quenching furnace is characterized in that: a heating chamber has a square body structure, cooling air ducts and nozzles are arranged around the inner wall of the square heating chamber, the nozzles are perpendicular to the surface of a working zone, two longitudinal ends of the heating chamber are provided with return air inlets, open-close air door structures with parallelogrammic rods are adopted, respective door opening cylinders are arranged and move almost perpendicular to a heat insulation layer, a convection fan is arranged in the heating chamber, and metal bellowses are used as dynamic seals at the sealing positions where the cylinders are introduced into the furnace; in a control system, each executive component is provided with an electromagnetic element which is connected with a circuit of the control system, and the opening and closing of air doors, the starting and stopping of the convection fan, and heating and cooling processes during the operation are interlockingly controlled by the control system. The novel heating chamber structure realizes convection heating, improves heating rate and evenness, reduces heat loss and also improves cooling effect.

Description

technical field [0001] The invention relates to a gas-quenching vacuum furnace for metallurgical equipment, which has convection heating nozzles for cooling the vacuum gas-quenching furnace. Background technique [0002] In the vacuum air quenching furnace, the nozzle cooling method is used, and the cooling speed is faster than the air door structure parallel airflow cooling method, which has been proved by practice. However, the nozzle cooling system adopts a fixed air return port. When the convection heating function is added, the heat loss of the fixed air return port is large, and it will also cause convection of the gas inside and outside the furnace heating room, resulting in uneven furnace temperature. Contents of the invention [0003] The object of the present invention is to provide a nozzle-cooled vacuum air quenching furnace capable of convective heating, which realizes convective heating, has low heat consumption and excellent cooling performance. [0004] Th...

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Problems solved by technology

However, the nozzle cooling system adopts a fixed air return port. When the convection heating function is added, the heat loss of the fixed air ...

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