DE2332267A1 - I.R. gas burner control - pulse generator in parallel with isolation transformer improves safety - Google Patents

Abstract

The pulse generator is parallel to both the primary of isolation transformer and a solenoid valve with contacts controlling the primary of ignition transformer of the gas burner. The delay controlling relay is connected to the a.c. supply via a temperature sensor which checks the heating and is in series with a generator while the n.o. contacts are in series with the n.c. contacts of the relly. Burner control unit is espec. suitable for multi-room heating, where e.g. continuous opening of doors, (creating a draught) is counteracted, by the delay controlling unit, preventing blow back etc.

Description

STEUEBEIMI (HiTUHGr FOR GASBREHHiffi IUFRiEOTER STHAHLUItG

The invention relates to the field of automation of gas burner units, in particular - control devices for gas burners infrared radiation and is for their remote ignition, the burning control and the automatic temperature maintenance in predetermined Limits when heating different rooms.

When using gas burners the infrared radiation is the most common cause of a ^; or a flashover into the mixing chamber of the burner of a brief and random nature. For example, a draft of air when the door is opened, a sudden change in gas pressure, Briefly switching off the gas and the like will cause the gas burner to go out or cause the flame to break through.

It is much rarer that the burner goes out or that the flame spreads out the consequence of a stable cause e.g. an occupation of the burner, a long-term gas shutdown, etc.

Ignition devices for gas burners of infrared radiation are known, which ensure repeated ignition when one or several burners are extinguished (see, for example, the USSR ^ Urhebersehein no.342614, class F22> d of March 30, 1970). These devices contain a control unit connected to the AC mains. The primary winding of the transformer for the burner ignition is connected to the control unit, while the - ^Λ burners are arranged in its secondary circuit via high-voltage capacitors

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Spark dischargers are switched on

A deficiency of these known devices is the lack of control of the actual burning process of the burners and their protection against the consequences of a flashover as well as the lack of control of damage to other elements of the device: the delay relay, the Burner ignition transformer of the spark discharger, etc.

Control devices for gas burners for infrared radiation are known, which ensure protection of the burners against the consequences of a flame penetration (see e.g. French Patent No. * 1415577 Class F23f), containing a chamber for a thermocouple arranged directly in the upper zone of the radiation surface of the gas burner , an electric valve, for controlling the gas supply, which is equipped with a return spring and two thermocouples mounted opposite one another, one of these thermocouples being arranged in said chamber and representing a transmitter that reacts to a flame breakdown, and the other close by the lower Strahlungsfläbhe mounted and ^v represents a control encoder of the gas burner and is connected to the Sfcuerwieklung of the electric valve behind the other so that the gas supply is guaranteed only during normal working of the burner. If a flame penetration takes place in the mixing chamber, the first thermocouple compensates the current of the second thermocouple and in this way causes the electrical valve to close under the action of the return spring.

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A control device for gas burners for infrared radiation is also known (see e.g. the USSR original certificate No. 254703 Class 24c, 10 issued on September 9, 1968), containing one connected to the AC mains Control unit, an electromagnetic valve, an ignition transformer, the primary winding of which is connected to ^ i '? mentioned Control unit is connected, as well as gas burners, each of which is equipped with a spark discharger, the is switched on in the secondary circuit of the ignition transformer, furthermore with a control transmitter of the gas burner and a donor who reacts to a flash of flames.

A shortcoming of these known devices is that in the event of the gas burner or in the event of a flashover, the gas supply is shut off, regardless of whether the cause, which is the disruption caused by the burner was of a short-term or stable nature. With a large number of burners, what especially when heating various agricultural and industrial rooms with infrared gas burners Radiation is the case, increases the amount of working time needed to determine the causes that led to the disruption to work caused by this gas burner is required.

A control device for gas burners for infrared radiation is also known £ see, for example, the patent specification of Soviet Union Hr · 346971, class F23n and from September 15, 1969), containing a connected to the AC network Control unit and connected to this unit:

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a temperature sensor of the "heated room, an electromagnetic one Valve, control transmitter of gas burner work and a Ignition transformer of the gas burner.

The control unit contains a delay relay whose winding is connected to the primary circuit of an isolating transformer the normally closed contacts of the control relay is connected, its winding in the secondary circuit of the the same transformer is switched on. The control givers of the work of the gas burners are connected in series and in including the secondary circuit of the isolating transformer, with the number of sensors corresponding to the number of gas burners. aside from that every gas burner is equipped with a spark discharger, which is inserted into the secondary winding of the ignition transformer the gas burner is switched on.

The above-mentioned control device for gas burners for infrared radiation ensures that the gas burners are lit again in the event of a malfunction in the burner work due to a short-term cause, as well as switching off the gas supply and switching on the fault signaling system if attempts to automatically eliminate the cause of the fault in the normal working process of the gas burners are unsuccessful , what with a stable disturbance of the burner work -'Irr F-: J. "·. Ir.

The shortcomings of the known device described above are that, firstly, they cut off the gas supply and the activation of the malfunction signal system in the event of a pardon for individual elements of the facility

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guaranteed. In addition, the shutdown time of the gas supply depends here from the specification of the time delay of the delay relay and the automatic re-ignition of the gas burner only takes place after the burner control unit has cooled down of the extinguished burner, which is why one is forced to donor to be selected with low response time.

The purpose of the invention is to eliminate the above-mentioned deficiency.

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As the basis of the invention, the object was such To create control device for gas burner infrared radiation, which a shutdown of the gas supply and a Activation of the malfunction signaling system not only in the event of a malfunction of the gas burner, but also in the event of damage individual elements of the control unit guaranteed.

This object is achieved in that in the control unit for gas burners of infrared radiation, containing a control unit connected to the alternating current network with a delay relay, the winding of which is connected to the primary circuit of an isolating transformer, as well as an electromagnetic Reiais, whose winding in the secondary circuit of the named transformer is switched on is, as well as connected to this control unit: - a temperature sensor of the heated tree, an electromagnetic one Valve, work control transmitter of the gas burner, which are connected in series in the secondary circuit of the same transformer the number of gas burner sender

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nerzahl corresponds, also an ignition transformer of the gas burner, whose primary winding is connected to the control unit mentioned above, and a ^{vl v} secondary winding over

dä

HochspannungskühdensäiT 'spark discharger switched are, according to the invention

The control unit also contains a pulse generator, the winding of which is connected in parallel to the primary winding of the isolating transformer and to the electromagnetic valve, and whose contacts are connected to the circuit of the primary winding of the ignition transformer of the gas burner, while the delay relay is connected to the alternating current network via the mentioned temperature transmitter of the heated room , wherein the norma celled open te contacts of the time delay relay are connected in series with the winding of the pulse generator connected, which are connected in tandem with the normaüjgeschlossenen contacts of the same relay, which have a Üffnungszeitverzögerung, and parallel to these contacts, the normaüJgeöffneten K _o ntakte of the electromagnetic Relays are switched.

An advantage of the device according to the invention compared to the known designs is that it offers the possibility of controlling the main elements of the control device. For example, the gas supply is switched off and the fault signaling system is switched on not only in the event of malfunctions in the gas burners due to a stable cause, but also in the event of damage to the delay relay. Except- 409881/0272

BATH ORIGINAL

VO "^ V ·" ¹ * P ο Γ * ^ I ^ * i ¹ ^ * f ⁷¹ Γ * P} "ί

The device according to the ^{invention, executed according to the circuit v,} offers the possibility of using work control transmitters of the gas burners with a significantly higher response time, which in turn ensures repeated ignition of the gas burners in the event of short-term malfunctions when using a pulse transmitter.

In order to explain the essence of the invention in more detail, a detailed description of a specific one is given below Embodiment of the device according to the invention brought with reference to the accompanying drawings.

Ed shows

1 shows the basic electrical circuit diagram of the invention Infrared radiation control device for gas burners in the event that each gas burner has an operating control transmitter the gas burner is equipped;

2 shows the basic electrical circuit diagram of the inventive Control device for gas burners of infrared radiation for the case when each gas burner with two Is equipped with work control transmitters of the gas burner,

The control device according to the invention for gas burners of infrared radiation contains a control unit 1 (FHg. 1) connected to the alternating current network with the following elements connected to this control unit: a temperature transmitter 2 of the heated tree, an electromagnetic valve 3, working control transmitters 4 of the gas burners (which are gas burners not specified on the drawing) and an ignition transformer 5 of the gas burner _f whose primary

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BATH ORIGINAL

ment 6 on off. above-mentioned control unit l connected is, while in its secondary winding 7 via high-voltage capacitors 8, the spark discharger arranged on the gas burners 9 are switched on.

The control unit 1 contains a delay relay with normally open contacts 11, normal / closed contacts 12 with an opening time delay and normal / open contacts 13 with a closing time delay, furthermore an isolation transformer 14, an electromagnetic relay 15 with two normally open contacts 16, 17 and two Normally closed contacts 18, 19jalso contains the Control unit 1 has a pulse generator 20 with contacts 21.

In the case when the work control transmitter 4 (Fig. 2) of the gas burner only react to the extinguishing of the burner, so are to protect against the consequences of a flame transmission to the secondary winding 22 of the isolating transformer 1 4 additional Work control transmitter connected to the gas transmitter, namely a transmitter 23 to protect the burner against the consequences a flashover with normally closed contacts and an electromagnetic relay 24, whose normally open contacts 25 in the circuit of the electromagnetic Valve 3 are switched on.

The connection of the control unit 1 (Fig. 1, 2) to the alternating current network takes place with the aid of the switch 26, with which parallel via the normalkesohlossenen contacts 18 of the electromagnetic relay 15 a red lamp 27, and via the normally open contacts 16 of the electromagnetic relay 15 via the normally closed contacts of the

Temperature sensor 2 of the heated room has a green lamp connected.

The delay relay 10 is connected to the switch 26 via the normally closed contacts of the temperature sensor 2 of the heated room, to which via a circuit that ^{realizes the logical puncture "AND M} " and which consists of the normally open contacts 11 of the delay relay 10 connected in series and the normal / open ones connected in parallel Contacts 17 of the electromagnetic relay 15 and the normally / closed contacts 12 of the delay relay 10 with an opening time delay are connected in parallel! A pulse generator 20, the primary winding 29 of the isolating transformer 14 and the electromagnetic valve 3.

In parallel with the pulse generator 20, via its contacts 21, the primary winding 6 of the ignition transformer 5 is the gas burner connected. Every gas burner has an operating control transmitter 4 of the corresponding gas burner, which both on the extinguishing of the burner and reacts to a flashover of flames. The work control transmitter 4 of the gas burners are connected in series, and their Normally open contacts are in the circuit of the electromagnetic Relay 15 included, which is switched into the secondary winding 22 of the transformer 14 is.

To the control unit 1 via the series-connected normally closed contacts 19 of the electromagnetic

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Relay 15 and the normally open K _o ntakte 13 of the delay relay 10 with a closing delay time is an electric bell 30 is connected.

In the normal operating sequence of the gas burner, the control device for gas burners of the infrared radiation works as follows:

When the switch 26 is switched on, the red signal lamp 27 lights up on the control unit 1 to indicate that that there is voltage in the control unit mentioned above. If the temperature in the heated room is below the value to which the temperature sensor 2 of the heated room is set, its contacts remain closed, and the Voltage is applied to the winding of the delay relay 10. The delay relay 10 responds and at the same time close its normally open contacts 11, thereby reducing the voltage across the normally closed contacts 12 of the delay relay 10 with an opening time delay and the closed normally open contacts 11 of the same relay of the primary winding 29 of the isolating transformer 14, the Pulse generator 20 and the winding of the electromagnetic valve 3 is supplied. The valve 3 responds and opens thus the gas supply to a gas burner group.

At the same time the tension is over the above Contacts 11, 12 and the normally closed contacts 21 of the pulse generator 20 of the primary winding 6 of the ignition transformer 5 supplied to the gas burner. From the secondary winding 7 of the ignition transformer 5 of the gas burner, the high-voltage

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Voltage supplied via the high-voltage capacitors 8 to the spark discharger 9, on which the spark discharge takes place. This is how the gas burners are ignited.

As soon as the temperature of the gas burner has reached a value that is necessary for the operating control transmitter 4 the gas burner is sufficient, a feed circuit of the electromagnetic relay 15 'is formed which responds to its norma] / closed contacts 18 and 19 open while normally open contacts 16 and 17 are closed; As a result of this, the red lamp 27 switches off, while the green lamp, as a signal that the device is being installed has been started (that all gas burners are working normally) lights up.

After the set time delay in the delay relay has elapsed 10, which shows the time to warm up the work control transmitter 4 of the gas burners before they are switched on must exceed, the normally closed open Contacts 12 with an opening time delay in the circuit of the electromagnetic valve 3 and close the normally open contacts 13 with a closing time delay in the circuit of the electric bell 30. In this The circuit remains in this state for the entire period of normal operation of the gas burners.

As soon as the air temperature in the heated room has reached the specified Has reached the value, the temperature sensor 2 of the heated room opens its contacts and all elements

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(except for the red signal lamp 27) are de-energized, including the electromagnetic valve 3, which consequently the Shuts off gas supply to the group of gas burners.

If the air temperature in the heated room drops, the temperature sensor 2 of the heated room closes its contacts, remote ignition of the gas burners takes place and the entire system is restarted as it was before has been described.

A repeated ignition in the event that one or several gas burners go out due to a short-term cause int pial> h ^: lr.ri3 ναι the response of the work control transmitter 4 of the gas burner and takes place thanks to the periodic connection / 'J ^ er contacts 21 of the pulse generator 20 (of the ignition transformer 5 of the gas burner ^ to the alternating current network during the entire working period of the gas burner.

If the work sequence of the gas burner has been disturbed by a stable cause, the work control transmitter speaks 4 of the gas burner, which not only indicates the extinguishing of a burner, but also a flashover reacts ^ »Relay 15 is de-energized, its contacts return 18 and 19 in their normal / closed position, and contacts 16 and 17 - respectively in the normal / open position Position back, whereby the green signal lamp 28 is switched off, while the red lamp 27 is switched on, the feed circuit of the electromagnetic valve 3 is interrupted, the electric bell 30 - the emergency signal - is switched on"

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Is a gas burner with two sensors (Fig. 2). a working control transmitter 4 of the gas burner and a burner protection transmitter 23 against the consequences of a flame, e.g., flashover _/ equipped, which enables automatic repeated ignition not only when the burner goes out, but also in the event of a flashover due to a short-term cause When the gas burner goes out, the operating control transmitter 4 exceeds the cooling time of the burner protection transmitter 23 against the consequences of a flashover ·

In the event of a flame penetration, the transmitter 23, which reacts to a flame penetration, is activated The supply circuit of the relay 24 is interrupted and a contacts 25 return to their normal opening position while the electromagnetic valve 3 is de-energized (the gas supply to the burner is interrupted) and dae begins Cooling down the gas burner.

c The cooling of the gas burner first calls for return

the contacts of the addressed burner protection transmitter 23 against the consequences of a flame penetration in their normay

emerged

ne starting position, where again a supply circuit of the relay 24 is formed, which therefore responds and closes its normally open contacts 25 in the circuit of the electromagnetic Valve 3, the response of which again ensures the gas supply to the burner group. Thanks to the periodic Connection of the voltage via the contacts 21 of the pulse generator 20 to the ignition transformer 5 of the gas burner

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a spark discharge in all spark dischargers 9 of the Gas burner guaranteed.

In this way, the gas supply to the gas burner group is temporarily interrupted in the event of a flame breakdown. after which the gas burners are lit again and, if the cause of the flame penetration has been eliminated, the normal operating sequence of the facility is automatically restored.

If a flame breakdown is caused by a stable cause, e.g. a crack in the ceramic gas burner attachment, the breakdown of the lines will often repeat itself, causing the contacts of the work control transmitter to open 4 the gas burner will cause the electromagnetic heat to be de-energized, and thereby return its Contacts 18 and 19 return to their normal / closed starting position, while contacts 16 and 17 return to their normal Return to the open position, whereby the green signal lamp 28 is switched off, the red lamp 27 lights up on, the supply circuit of the electromagnetic valve 5 is interrupted, and the electric bell 30 - the emergency signal turns on.

Thus, the control device according to the invention for gas burners ensures the infrared radiation in their The design allows an automatic ignition and a restoration of the normal working sequence of the gas burners if the cause of the malfunction of the Gas burner is of an accidental and short-lived type,

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and a shutdown of the gas supply with an emergency signal if the cause of the malfunction of the gas burner stable type is

The control device according to the invention finds a wide extensive use in heating various agricultural and industrial spaces with gas burners the infrared radiation makes it impossible to save the Working time required to determine the causes of the disruption to work the gas burner

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Claims (1)

PATENT CLAIM Control device for gas burners of infrared radiation, including a control unit connected to the alternating current network with a delay relay, the winding of which is connected to the primary circuit of an isolating transformer, and an electromagnetic relay, the winding of which is connected to the secondary circuit of the same transformer, as well as connected to this control unit: a temperature sensor of the heated environment, an electromagnetic valve, control donors are of the gas burner, which are connected in the secondary circuit of the same transformer in series further comprises an ignition transformer of the gas burner, whose primary winding is connected to the above-mentioned control unit, and connected to _v secondary winding of high voltage capacitors Funkenentlader , which are arranged xn the gas burners, characterized in that said control unit additionally contains: a pulse generator (20), the winding of which is parallel to the primary winding of the T Running transformer (14) and parallel to the electromagnetic valve (3) is connected, and its contacts (21) in the circuit of the primary winding of the ignition transformer (5) of the gas burner are switched on, said delay relay (10) of this unit to the AC network via the mentioned temperature sensor (2) of the heated room connected and in series with the winding of the pulse generator (20) the normal ^ open 409881/0272 Contacts (11) of the delay relay (10) are switched,
which are connected in series with the normally closed contacts (12) of the same heater (10), which have an opening time delay, and to which the normal / open contacts (17) of the aforementioned electromagnetic
Relays (15) are connected in parallel. 409881/0272 Blank page