SU1344790A1 - Device for controlling carbon potential of furnace atmosphere - Google Patents

Abstract

This invention relates to. chemist o-. heat treated metals. The purpose of the invention is to improve the quality of processing products by increasing the accuracy of regulation. The essence of the invention is that ras-HapSfopuzer P f 7-7 I Soot if y installs electrode 5 relative to the body 3 of the cooled electrode 2 and is supplied to the internal cavity 4 of the body 3 refrigerant. After reaching a stationary temperature distribution along the length of the housing 3, the regulator 9 according to the electrical conductivity of the input circuit generates a signal to the actuator 10, which acts on the valve 11, depending on the presence or absence of soot. In the presence of soot released from the atmosphere of the furnace, when it comes into contact with the colder surface of the housing 3, the electrical conductivity of the input circuit of the regulator 9 is maximal; and it generates a signal to reduce the supply of gas-carburizer to the furnace 1. 1 Il. c f) c / Of suiadcfeenma

Description

The invention relates to the chemical and heat treatment of metals and can be used in mechanical engineering for controlling the carbon potential in furnaces and generators with a controlled atmosphere.

The purpose of the invention is to improve the quality of processed products for account of the accuracy of regulation.

The drawing schematically shows the device.

The device contains the first electrode 2 placed in the furnace 1. The case 3 of the electrode 2 is made of a material inert with respect to carbon, for example, nickel, ceramics, and has a cavity 4 for supplying a refrigerant (for example, water) providing a predetermined constant temperature distribution over body length 3.

The element is sensitive to the loss of soot, made in the form of two electrodes in contact with each other in the presence of soot. As one of the electrodes, the body 3 of the electrode 2 (in the manufacture of it from a current-conducting material) serves. The other electrode 5 of the element sensitive to the loss of soot is mounted for movement along the body of the electrode 2 by means of the guide 6. At the exit of the furnace, the body of the electrode 2 and the guide 6 are fixed on the insulator 8.

The electrodes of the sensing element are placed with a gap between them, provided by the insulator 8 (for example, from mica), and connected to the regulator 9 of the gas supply to the carburizer The regulator 9 output is connected through the actuator 10 to the gate 11 gas carburizer in the oven.

If the body 3 is made of ceramic, which is not conducting at the operating temperature, the electrode can be formed by the body 3 if soot is present on it.

The device works as follows, b-time.

In the process of setting up the furnace, the position of the electrode 5 relative to the housing 3 is determined according to a known dependence,

VNISHSh Order 4888/27 Circulation 549 Subscription Proizv.-poly. pr-tie, Uzhgorod, st. Design, And

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corresponding to the required technology carbon potential. Having installed the electrode 5 in a given place by means of the guide 6 passed through the insulator 7, the device is placed in the furnace 1 and the refrigerant is fed into the internal cavity 4 of the housing 3. After reaching a stationary temperature distribution along the length of the housing 3, the regulator 9 according to the electrical conductivity of the input circuit generates a signal to the actuator 10, which acts on the valve 11, depending on the presence or absence of soot.

When there is soot released from the atmosphere of the furnace, when it comes into contact with the cooler surface of the housing 3, the electrical conductivity of the input circuit of the regulator 9 is maximum and it generates a signal causing a decrease in the carburizer gas supply to the furnace 1. If there is no soot, then regulator 9 generates a signal to increase the supply of gas-carburizer.

Thus, the closed control loop monitors and maintains the constant carbon potential of the controlled atmosphere during tuning.

The use of the invention allows to reduce the cost of equipment, to increase its service life and durability of the processed parts by ensuring the required distribution of carbon in the cemented layer.

Claims (1)

Apparatus for controlling the atmospheric carbon potential of a furnace, comprising a sensor connected to a regulation system for supplying a gas-carburizer to the furnace, and a temperature controller, characterized in that, in order to increase the quality of the processed products by increasing the regulation accuracy, the sensor is designed as two electrodes, one of which is equipped with a cooling system, and the other is mounted for movement along the first electrode, both electrodes being installed in the wall of a chip and insulated s it.