DD148672A1 - CIRCUIT ARRANGEMENT FOR TURNING AND FLAME MONITORING - Google Patents

Abstract

The invention relates to a circuit arrangement for quitting and flame monitoring of gas burners. The object of the invention is to improve the reliability of the gas burner. It is an object of the invention to provide a circuit arrangement which makes it possible to use an electrode alternately as Zuend- and Flammenueberwachungselektrode. The features of the invention consist in that the switchover / monitoring is arranged in the primary circuit of an ignition transformer, the changeover contact being arranged as a switch between the ignition transformer connected in series with an electrode on the one hand and an ignition pulse generator and an ionization monitoring apparatus on the other hand and d. Ionisationsueberungsgeraet over its signal output with a clock and the changeover contact in series. The application of the circuit arrangement takes place for gas burners.

Description

Title of the invention

Circuit arrangement for ignition and flame monitoring

Field of application of the invention

The invention relates to a circuit arrangement for igniting and flame monitoring of gas burners _o

Characteristic of the known technical solutions

Are known independent circuit arrangements for igniting and monitoring of flames (gas international heat, September 1974, page 353 ff) · Despite various internal circuits for such arrangements in the burner at least one Zündele tetrode and a monitoring electrode is necessary (DD-PS 111 729, DE -PS 78,206). The ignition takes place u, a "on the basis of the high-voltage ignition, wherein it is controlled by an ignition pulse.

Flame monitoring is carried out on the basis of the ionization * This is essentially a circuit in which current flows through the electrode to the burner when there is a small resistance. »If the flame extinguishes, the resistance of the cold one is zero Gas is very large and the current flow accordingly small _e This indication forms the basis for the re-commissioning of the ignition electrode. The disadvantage is that these separate circuits are not applicable to gas burners with an electrode for design reasons.

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Object of the invention

The object of the invention is to improve the reliability of ignition and flame monitoring.

presentation; the essence of the invention

It is an object of the invention to provide a circuit arrangement which makes it possible to use an electrode alternately as ignition and flame monitoring electrode ©

The invention solves the problem in that the switching ignition / monitoring in the primary circuit of an ignition transformer is arranged v / obei the switching contact as a switch between the connected in series with an electrode ignition transformer on the one hand and a Zundimpulsgeber and a Ionisationsüberwachungsgerät on the other hand is arranged and the ionisationsüberwachungsgerät via its signal output with a clock and the changeover contact in series «

Ausführun ^ SExample

The invention will be explained in more detail below with reference to an exemplary embodiment. In the associated drawing, the circuit arrangement according to the invention is shown.

The gas burner consists of a jacket tube 1, a burner head 2 is suseordnet "at the transition point between the jacket tube 1 and the burner head 2 is a nozzle plate 3 is provided in the gas burner is sentrisch a mutually serving for ignition and flame monitoring, with an insulation 4 surrounding Electrode 5 is arranged »The electrode 4 is connected via an ignition cable 6 with an ignition transformer L. Electrically separated by the contacts of a changeover contact к 6, the ignition transformer L an ignition pulse A 1 and an ionization monitor A 2 are connected upstream. The output relay of the ionization monitoring device A 2 in a current path ST 1 an indicator light H 1 - flame off - and in a current path ST 2 an indicator light H 2 - flame available - assigned »in a current path ST 3 is parallel to the indicator light H 2 an opening

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Relay К 3 switched. In a current path ST 4 there is a pushbutton 5 "in series with the relay contacts к О and к X in a current path ST 5 and with the parallel-connected relay coil KO in the current path ST 4 and a time relay K 1 in a current path ST 5 connected in series is β In a current path ST б a series connection of relay contacts к 0 and к 1 with a relay coil к 2 is arranged »The circuit combination of current paths ST 4 to ST 6 represents the starting device» Parallel connection of three series connections relay contact к б with Time relay к 4 in a current path ST 7i Relay contact к 4 with time relay к 5 in a current path ST 8 and relay contact к 5 with a detaining contact к 6 in a current path ST 9 »is in series with relay contacts к 3" and к 2, The circuit arrangement of Current paths ST 7 to ST 9 image et ignite the timing generator _β The relay contacts к connected in parallel in a current path ST 10 and the relays contact e к 2 in a current path ST 11 form with the coil of a Ivlagnetventils Y a series circuit β Sin solenoid valve Y is disposed in a fuel gas / air-Gomischleitung 7 «

The circuit of the circuit arrangement is as follows: Pressing the S button energizes the relay coils KO and K 2. The relay coil K 2 opens the solenoid valve Y 2 to the gas burner, puts the timer ST 7 - ST 9 into operation and actuates the Changeover contact к б in direction - Ignition -. With the changeover contact к б the ignition pulse A 1 is simultaneously turned on and the ignition voltage generated via the ignition transformer L. This ignition phase is terminated with the switching of the time relay K 5 »The contact contact к б goes into the neutral position and disconnects the ignition pulse generator A 1 from the ignition transformer« In the rest position of к б the always ready ionization monitoring device A 2 is above the ignition transformer L with the Electrode 4 connected in the gas burner. If the monitor A 2 still no flame, the ignition is repeated after a set time on the timer K 4. If the flame is present at one of the next monitoring periods, the output of the ionization monitor A 2 switches from H 1 to H 2

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and the opening relay K 3 takes over the keeping open of the solenoid valve X. At the same time the clock ST 7 - ST 9 is turned off. If the gas burner does not ignite within a safety time that can be set on the time relay K 1, the fuel gas / air mixture supply to the gas burner is shut off »A restart is only possible after the relay contact KX has been actuated, eg. Forced ventilation of combustion chambers is possible. The invention improves the ignition security and flame monitoring.

Claims (1)

-5- 218550 invention claim Circuit arrangement for ignition and. Flammenüberv / achen of gas burners, characterized in that the switching ignition / monitoring in the primary circuit of an ignition transformer (L) is arranged, v / obei the switching contact (к б) as V / oak between the connected with an electrode (5) in series Ignition transformer (L) on the one hand and an ignition pulse (A 1) and a lonisationsüberwachungsgerät (A 2) on the other hand is arranged and the Ionisa- tion Überv / achungsgerät (A 2) via its signal output with a clock and the changeover contact (k 6) in series. For this 1 page drawings