SU943668A1 - Device for regulating temperature - Google Patents

Description

(5 |) DEVICE FOR REGULATING TEMPERATURE

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The invention relates to automatic systems and devices for control of technological processes, in particular, to automatic schemes for software control of the temperature regime in the sublimation process.

Temperature regulators are known that contain a thermocouple included in the auto-complex potentiometer circuit through a null device. The output of the nuhpribor is connected to the input of the first electric motor. The shaft of the first electric motor is connected to the engine of the auto-compensation potentiometer and the engine of the regulating rheochord. The middle point and the slider control rod are connected to the input of the second engine. The shaft of the second motor is connected to an autotransformer, the output of which is connected to the input of the load | one .

The absence of negative feedback in the circuit reduces the control accuracy with this circuit.

The closest technical solution to the invention is a device containing a self-balancing pavement circuit, with a balancing potentiometer in one arm and a control unit in the other. An amplifier is connected to the diagonal of the bridge circuit, to the output of which is connected a motor used as feedback. The motor speed is proportional to the voltage taken from the bridge diagonal to obtain an output signal to the amplifier in the form of voltage or current. The motor shaft is kinematically connected with the moving contact of the balancing potentiometer. The device also contains an actuator and a power source G2.

This scheme is intended for single-stage adjustment and cannot provide a sufficiently high adjustment accuracy.

Claims (2)

The aim of the invention is to increase the accuracy of temperature control of the heating installation. This goal is achieved by the fact that a device for temperature control, containing a measuring probe connected in series with a balancing potentiometer in one of the arms and a programming unit in the other, the first amplifier and the first motor, whose kinematically shaft is connected to the movable contact of the balancing potentiometer, as well as the actuator and power supply, equipped with a serially connected second amplifier and a second motor connected to the power supply, the first potentiometric divides Lemma voltage and connected to the output of the actuator second potentiometric divider voltage to the midpoint of a voltage divider connected inputs of the second amplifier, wherein the movable contact of the first potentiometer delitel voltage kinematically coupled with a shaft of the first motor. In the drawing, a schematic diagram of a device for temperature control is given. The device for temperature control contains a sensor 1 and a program setting device 2, a measuring bridge 3, containing a potentiometer k of the current temperature value, a potentiometer 5 of a manual balancing bridge, at the start of operation of the device a potentiometer 6 of set temperatures, a balancing potentiometer 7. Measuring bridge output 3 is connected to the input of the first amplifier 8, the output of which is connected to the first engine 9. The shaft of the engine 9 is kinematically connected with a balancing potentiometer 7. The potentiometric dividers 10 and 11 are voltage form a dual cantilever comparing circuit for voltage. The midpoints of the voltage dividers 10 and 11 are connected to the inputs of the second amplifier 12, the output of which is connected to the input of the engine 13. The device is supplied with a source H of power, the output of which through the actuator 15 is connected to a heating device 16. The shaft of the engine 13 is kinematically connected with the actuator 15. The first potentiometric voltage divider 10 comprises a power transformer 17, the input of which is connected to the output of the power supply source AND, a balancing potentiometer 18, kinematically connected with the motor shaft 9 , and a resistor 19. The second potentiometric voltage divider 11 contains a power transformer 20, the input of which is connected to the output of the actuator 15, a potentiometer 21 of manual adjustment and a resistor 22. The device operates as follows. The program unit 2 turns an angle proportional to the set temperature potentiometer 6, and the sensor 1 signal temperature values to the potentiometer 4. The output of the bridge circuit 3 through the first amplifier 8 is supplied to the engine 9. The motor shaft 9 actuates the balancing potentiometer 7, which provides self-balancing measuring bridge 3. In addition, the motor shaft 9 drives the balancing potentiometer 18 of the first potentiometric voltage divider 10, which provides a connection between a bridge 3 and a divider 10 voltage. Potentiometric voltage dividers 10 and 11 form a two-arm voltage comparison circuit that compares the voltage at the output of the power supply 1 to the voltage at the output of the actuator 15, in our case the autotransformer. The voltage mismatch signal is amplified by the second amplifier 12 and is supplied to the motor 13. The motor shaft 13 drives the regulator of the actuator 15. The motor 13 corrects the output signal of the actuator 15. As a result, the voltage on the heater 16 increases or decreases. before putting the circuit in balance. The use of the following systems and voltage dividers in the device for temperature control of the self-balancing bridge allows for smooth control, increasing the control accuracy. By increasing the accuracy of temperature regulation in the sub-process, time is reduced simply by the magnitude of the vacuum or cold; production yield increases by 12.5%; it becomes possible to develop the technology of processing new products in the production process. Apparatus of the Invention A temperature control device comprising a measuring bridge connected in series with a balancing potentiometer in one of the arms and a programming unit in the other, a first amplifier and a first motor, the shaft of which is kinematically connected to the moving contact of the balancing potentiometer, as well as an actuator and power supply, distinguished by the fact that, in order to increase the accuracy of the device, it contains a second amplifier and a second motor connected in series Since the first potentiometric voltage divider and the second potentiometric voltage divider connected to the output of the actuator, the inputs of the second amplifier are connected to the midpoints of the first and second potentiometric voltage dividers, we will take the moving contact of the first potentiometer balancing potentiometer to kinematically with the shaft of the first engine. Sources of information taken into account during the examination 1. Svenchansky AD and others. Automatic regulation of electric furnaces. N.-L., Energie, 1965, P.178, fig.Zba .. 2. USSR author's certificate number 127871. class. G 05 O 23 / 2t, 1959 (prototype).