SU418120A1 - Device for automatic control of infrared burners - Google Patents

Description

J

FIELD OF THE INVENTION The invention relates to the field of automatic control of gfcpka and, in particular, burners infrared radiation, chen (GII) and. It can be used for heating various industrial and agricultural industrial premises.

There are known automatic control devices for GII containing a control panel,, an ignition transformer, a sensor. the room temperature, the solenoid valve and the burner, each of which is provided with an electric igniter for the ignition of the burner, a combustion control sensor and a flame protection sensor into the burner injector.

However, such devices do not ensure gas shutdown and activation of the alarm when individual elements (time relays) fail, the gas off time depends on the time relay setting, and automatic ignition is performed only after the control of the extinguished burner has cooled, which causes selection with low inertia response

The aim of the invention is to increase the reliability and efficiency (1) of the efficiency of operation of the device.

This is achieved by the fact that, in the proposed device, an electromagnetic kpapi is connected to a power source through a circuit consisting of successively connected normally open time relay contacts and normally open relay control contacts that are shunted during the ignition period by normally closed time relay contacts opening, about 4 winding of the control relay is connected to the power source according to the self-locking scheme through the above stump, isolation transformer and normally connected in series About the contacts of all sensors monitoring the combustion and reacting to flame flashing into the burner injector.

The provision of automatic ignition repeats is carried out by introducing into the circuit a pulsed-O chopper connected to a power source parallel to the coil of the solenoid valve, periodically opening and closing contacts of which are included in the primary winding of the ignition transformer. The drawing shows the electrical circuit of the proposed device. It contains a control panel that includes an automatic 4-point switch 1, warning lights, red 2 and green 3, a temperature sensor 4 connected with a contact, a time relay 5, a pulse interrupter 6, a separator transformer 7, a control relay 8 with contacts, an electric call 9 and the burner (not shown in the drawing), each of which is equipped with a 1O sensor that monitors the combustion and protects against flame breakthrough into the burner injector installed in front of the burner - at a distance that ensures that it is switched on when opt The temperature of the Goressey radiating surface, the spark plug 11, connected via a high-voltage capacitor 12 to the ignition transformer 13. Gas is supplied to the burner group via the solenoid valve 14. When the automatic switch 1 is turned on on the front panel of the control unit. The red light 2 is illuminated to indicate the presence of voltage. If the room temperature is below the set point of temperature sensor 4, then its contacts are closed (as shown in the drawing), and the voltage is applied to the time relay winding. The time relay is triggered, and its normally open contact is one-time closed. In this case, the voltage through a normally closed contact of a time relay with an open time delay and a normally open contact of the same relay is supplied to the primary winding of the separation transformer 7, pulse interrupter 6 and the solenoid valve winding 14. The latter is triggered and opens gas access to the burner group. At the same time, the voltage through the above contacts and through the normally closed contact of the pulse breaker is supplied to the primary winding of the ignition transformer 13. From the secondary winding of the transformer 13, the high voltage through the high barriers. The capacitors 12 are supplied to sparkling spark plugs 11, on which a spark occurs. The burners are ignited. As soon as they come to a normal operating mode, i.e. the temperature of the radiating surface of the GII reaches ojii-i of the maximum value, the sensors 10 are triggered, the control relay 8 power supply circuit is formed, it triggers. The red light 2 turns off and the green light 3 turns on - a signal that all GIIs are working and all elements of the device are working, the normally open contact in the solenoid valve 14 circuit is closed, the normally closed contact in the electric alert circuit 9 is closed. time, the normally closed contact of the time relay is opened with a time delay for opening in the circuit of the solenoid valve 14, and the normally open time relay contact is closed with a time delay for the short in the circuit electrocall 9. In this state, the circuit is during the whole period of GII operation. When the desired air temperature in the room is reached, the sensor 4 opens its contacts, and all elements (except the red light bulb 2) de-energize. The solenoid valve 14 stops the flow of gas to the GII group. When the temperature of the air in the room decreases, sensor 4 triggers a short circuit, in this case automatic remote ignition takes place, and the entire system goes into operation in the manner described above. Automatic re-ignition in case one or several GIIs are extinguished due to a short-term nature is not associated with the inertia of sensor response and occurs due to the periodic connection of the ignition transformer 13 to the power source during the entire period of GII operation. If the violation of the GII operation mode is stable, the sensor 10 is triggered, the control relay 8 is de-energized. This turns off the green light 3, turns on the red light 2, stops the gas supply to the GII, turns on the electric alert 9 — the alarm signal. The subject of the invention is an automatic control device for infrared radiation burners, comprising a control panel, an ignition transformer, a room temperature sensor, a solenoid valve, a control relay and burners, each of which is equipped with an electrical valve and sensors that monitor the flame burning and burning of flame. In order to ensure efficiency and reliability, parallel to the solenoid valve, an impulse interrupter with contacts connected to the circuit rvichnoy ignition transformer winding and the primary winding of the isolating transformer connected to the power supply through a circuit consisting w

From the series-connected normally open contacts of the time relay and parallel-connected normally open contacts of the control relay and normally closed contacts of the time relay with delayed opening, and the secondary winding of the isolation transformer is connected to the control relay winding; serially connected normally open sensor contacts.