Heat exchanger for slow cooling and preheating of isothermal normalizing furnace

Abstract

The invention discloses a heat exchanger for slow cooling and preheating of an isothermal normalizing furnace. An upper layer of combustion flue and a lower layer of combustion flue are arranged in a furnace body of the isothermal normalizing furnace; a preheating section is arranged at the front end of the upper layer of combustion flue; a heating insulation section is arranged at the middle and rear end of the upper layer of combustion flue; a slow cooling section is arranged at the front end of the lower layer of combustion flue; a rapid cooling section and an isothermal section are sequentially arranged on the middle and rear end of the lower layer of combustion flue along the conveying direction of materials; and transmission net bands are arranged inside the upper layer of combustion flue and the lower layer of combustion flue. Particularly, the furnace body forms a heat convection zone at the front ends of the upper and lower layers of combustion flues in a penetrating manner while the heat exchanger is arranged inside the heat convection zone, and is provided with a fan at the top of the heat convection zone, and an air flue which extends to the lower layer of combustion flue in a semi-closed manner; and air inside the heat convection zone flows through the upper layer of combustion flue, the fan and the air flue from the lower layer of combustion flue in an internal cycle. By application of the heat exchanger disclosed by the invention, the internal cycle speed for slow cooling and preheating of the isothermal normalizing furnace can be controlled, full recycling utilization of heat energy is greatly improved, and the industrial production requirements of outstanding energy conservation and emission reduction are met.

Description

technical field [0001] The invention relates to an isothermal normalizing treatment device for metal parts, in particular to a heat exchanger for realizing slow cooling and preheating treatment of workpieces by rationally utilizing heat energy in normalizing treatment, and belongs to the field of casting equipment. Background technique [0002] In the prior art, metal workpieces (such as gray cast iron, high chromium steel balls, etc.) are normalized and air-cooled and quenched to provide necessary preparations for subsequent cutting processes such as forging or casting workpieces. Generally, after heating and heat preservation in the furnace, it is followed by rapid air cooling, in which the heat energy of the workpiece is lost after cooling, so there are defects such as large energy waste and serious heat pollution. [0003] As a result, some creators have proposed an improvement plan, such as a heat recovery type continuous isothermal normalizing furnace disclosed in the ...

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Problems solved by technology

[0004] The purpose of the present invention is to propose a heat exchanger for slow cooling and preheating in an isothermal normalizing furnace to solve the problem of heat convection intensity of slow cooling and preheating control in normalizing and air-cooling quenching processes

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