RU68107U1 - CHAMBER ELECTRIC FURNACE - Google Patents

Abstract

The batch chamber electric resistance furnace is designed to heat billets before hot forging and allows for uniform cooling of the furnace and efficient use of heat of cooling. When cooling the chamber electric furnace, the fan (7) moves the gas heat carrier through a system of pipes (6) located in the body (1) of the furnace. The control valve (12), as indicated by the temperature sensor (5), increases the coolant flow in the pipe system (6) as the furnace cools, while not only are conditions for uniform and smooth cooling of the lining (3) and thermal insulation (4) of the furnace, but also the heat load on the heat exchanger is stabilized (10). The flow rate of the liquid coolant in the heat exchanger (10) is changed by a control valve (13) connected to the temperature sensor (14). 1 s.p. f-ly, 1 ill.

Description

The invention relates to thermal equipment, in particular to batch chamber electric resistance furnaces for heating workpieces before hot forging and for heat treatment of parts in aircraft manufacturing.

Known electric resistance furnace of periodic action, comprising a housing with a lining and thermal insulation, electric heaters and pipes located in the housing, through which during the cooling period of the furnace moves the gas and liquid coolant / RF Patent No. 2252580, IPC 8 F27V 3/08 publ. 06/25/2005 Bull. No. 18 /. Based on the set of essential features, this technical solution is selected as a prototype.

In this electric furnace, the cooling process is uneven, especially at the initial stages of supplying gas and liquid coolant, which can lead to the destruction of the dense refractory ceramic lining of the furnace and significant temperature fluctuations of gas and liquid coolants supplied to external consumers.

The technical result of the utility model is to ensure a long service life of the chamber electric furnace due to the uniform cooling of its refractory lining and stable temperature of the coolant entering the external consumer during cooling of the electric furnace.

To achieve a technical result in the proposed chamber electric furnace, comprising a housing with a lining and thermal insulation, electric heaters, a temperature sensor of the furnace, located in the pipe body, connected by inlet and outlet pipes with a fan

for supplying gas coolant to the furnace during the cooling period, a heat exchanger is installed on the outlet pipe to heat the liquid coolant, and the inlet and outlet pipes are connected bypass heat-insulated pipe with a control valve that is connected to the furnace temperature sensor. To stabilize the temperature of the coolant entering the external consumer on the liquid coolant supply line, a control valve is installed connected to the temperature sensor on the hot liquid coolant drain line.

The essence of the utility model is illustrated in the drawing.

The chamber electric furnace consists of a housing 1 with electric heaters 2, a refractory lining 3 and heat insulation 4. A temperature sensor is installed in the working chamber of the furnace for measuring temperature 5. A pipe system 6 is located between the refractory lining 3 and insulation 4 in the housing 1 of the electric furnace 6. Fan 7 8 and the heat-insulated pipes 9, connected to the pipe system 6. The heat exchanger 10 is installed on the pipe 9, in which the heated liquid coolant (water) moves through the pipes, and along the inside Under the influence of fan 7, the gas coolant (air) moves under the influence of fan 7. The bypass heat-insulated pipe 11 communicates the inlet 8 and the outlet 9 pipelines and contains a control valve 12 connected to the temperature sensor 5. In the heat exchanger 10 on the supply line of the heat-transfer fluid there is a control valve 13 connected to the temperature sensor 14 on the discharge line of the heated heat-transfer fluid.

When cooling the chamber electric furnace during a planned stop of production by fan 7, the gas coolant is supplied to the pipe system 6, and at the initial stage at high temperature of the furnace according to the temperature sensor 5, the control valve 12 is maximally

open and the flow of gas coolant through the pipes 6 is minimal, which ensures uniform and smooth cooling of the electric furnace. As the temperature in the working chamber of the electric furnace decreases, according to the temperature sensor 5, the control valve 12 partially shuts off and more gas coolant from the fan 7 flows through the pipes 6 to cool the electric furnace, which accelerates the cooling process. By changing the flow rate of the gas coolant through the pipes 6 during cooling of the electric furnace, uniform cooling of the refractory lining 2 and a long service life of the electric furnace are ensured. In addition, with a controlled change in the flow rate of the gas coolant through the pipes 6, the heat load on the heat exchanger 10 is stabilized, in which the gas coolant (air), after increasing the temperature in the chamber electric furnace, heats the liquid coolant (water), for example, in a hot water supply system.

To stabilize the temperature of the liquid coolant entering the external consumer at the outlet of the heat exchanger 10, the control valve 13 changes the flow rate of the coolant according to the temperature sensor 14.

Compared with the base object (see prototype), the proposed technical solution provides more uniform and smooth cooling of the furnace, which increases the duration of operation of the ceramic refractory lining and the life of the chamber electric furnace. The controlled flow rate of the cooling gaseous heat carrier (air) and the heated liquid heat carrier (water) leads to stabilization and the possibility of regulating the temperature of the liquid coolant entering the external consumer.

Claims (2)

1. Chamber electric furnace containing a housing with a lining and thermal insulation, electric heaters, a furnace temperature sensor located in the pipe body, connected by inlet and outlet pipelines with a fan for supplying a gas coolant to the furnace during cooling, characterized in that a heat exchanger is installed on the outlet pipe for heating the liquid coolant, and the inlet and outlet pipes are connected bypass heat-insulated pipe with a control valve that is connected to the sensor The temperature of the furnace. 2. The chamber electric furnace according to claim 1, characterized in that a control valve is installed on the liquid coolant supply line connected to a temperature sensor on the heated liquid coolant drain line.