SU468281A1 - Temperature control device - Google Patents

Description

one

(The invention relates to automatic CHrHajmaauHH and is intended for multi-j point control of the temperature of thermal power plants in power plants.

A device for controlling temperature, containing a secondary signal / shear, is known. a device connected via the appropriate closing contacts of the program switch relay to the temperature sensors, and an alarm unit consisting of signal lines with indicators connected in parallel with the power source, a control key and a switch.

However, in such a device, the light signal is not saved for the time required for the operator to make the appropriate decision. The light signaling is stored only for that period of time, when the contacts of the program switch are closed. This significantly reduces the operational characteristics of the device, which is important because with a large amount of information the operator {cannot simultaneously respond to all signals and take appropriate decisions to memorize all the information in a limited period of time. The proposed device is characterized in that a thyristor is inserted into each signal circuit of the signaling unit, which is connected in series with the indicator, and a resistor, the thyristor cathode is connected to the minus width of the power source through a switch, and the control electrode is connected to the key via a corresponding closing contact of the program switch relay control, connected in parallel to the closing -contact of the secondary signaling device and connected through a resistor with a pliable thickness of the power source.

This makes it possible to increase the reliability of the device in operation.

FIG. 1 is a schematic diagram of the inclusion of a secondary signaling instrument with a set of thermal sensors; ya fig. 2 is a schematic diagram of the signaling unit; in fig. 3 - principal, software switch circuit. The device for temperature control contains: thermal sensors 1-4, relay 5-10 of the program recloser, closing relay 11-14, secondary signaling device 15, closing contact 16 of the secondary signaling unit, control key 17, switch 18, thyristors 19-21, indicators 22-24, resistor 25. The software switch of the device consists of a synchronous motor 26, a reducer 27 mounted on a magnetic plate 28, which is the carrier part of the frame and is located perpendicular to the output shaft of the gearbox. At the weekend; At the reducer to the magnetic plate, the core 29 is fastened with the winding of the exciter ZO. Equal distances from the gray of the core with the excitation winding on the magnet plate are installed the cores 31-36 with the control windings connected through the power diodes 43-48 to the circuits. thyristors 49-54 with the windings of the relay 5-10 in the anode circuit are shunted by capacitors 55-6О. The control unit of the switch is connected to the reference voltage- / AC. The synchronous motor 26 is turned on using a locking knob 61. A movable core 62 is fixed to the output shaft of the gearbox 27 on the front side of the core 29. Thermal sensors 1-4 are connected in a certain sequence to the secondary device 15 by closing the contacts of the relay 5-10 of the program switch. Due to the contacts of the relay 5-10, the thyristor control circuits of the alarm unit are connected. The contact 16 of the secondary device 15 in the alarm unit closes in. if at any controlled point of the object the temperature rises relative to the specified limit, In this; in case of closure of contact 16 and aamyka, the formation of the corresponding thyristor control circuit leads to the activation of the signal; lamp in the anodic depy of this thyristor. The signal lamp remains on until the operator using the switch 18 opens the thyristor power supply circuit. Thus, while simultaneously turning on, counting several and even all signal, lamps, light information is stored (remembered) until it is removed by the operator. Using the circuit with key 17, it is possible to check the proper operation of the entire circuit of the device, including., And signal lamps. The subject of the invention A device for temperature control, comprising a secondary signaling device, connected via a corresponding closing relay of a software switch to temperature sensors, alarms consisting of those connected in parallel with the power supply signal-; circuits with indicators, a control key and a switch, characterized in that, in order to increase its reliability S, operation, each signal circuit; an alarm unit is inserted a thyristor that is connected in series with the indicator and a resistor, with the cathode of the thyristor connected to the negative thickness of the source pi. Tany through a switch, and a Y-step electrode through a corresponding closing contact of the program switch relay — with a control key connected in parallel with the closing contact of the secondary signaling device and connected –H jiM- via a resistor to the positive power supply bus.

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