EP1188989A2 - Furnace device - Google Patents

Abstract

The fire has a main burner (3) connected to a fuel supply line (6) and supplied with fuel and air for the illuminating flame (2). A main burner valve (5) is connected to a main burner actuator (11) and is mounted in the fuel supply line to open and shut off the fuel supply. A further device (17) is provided to produce the blue (non-illuminating) ignition flame and a flame monitor device (25) provided here in the region of the blue flame has a high voltage spark ignition with spark path on the device in the region of the flame. A control device (9) is attached to the main burner actuator (7), the flame monitoring device and the high voltage spark device.

Description

The invention relates to a firing device, in particular a gas operated firing device for Living rooms.

Gas-powered homes are increasingly coming Firing equipment in use which is a glowing Create flame. Such a flame glows red or yellow, the glow of small (glowing) carbon particles goes out, which are contained in the flame and burn. Such flames are, for example, in gas-powered, decorative Fireplaces, stoves or similar devices wished to have yellow-blazing flames.

Gas appliances of this type must have a high security standard fulfill. In any case, there must be an outflow of unburned gas can be prevented because of this substantial Dangers for residents and property can endanger. On the other hand, the operation of such devices should be possible be simple and comfortable. In addition, gas appliances of the entire type often only without connection to an electrical To operate the supply network. A corresponding gas device should take this into account.

Based on this, it is an object of the invention Furnace to create a high level of security and allows a high level of user comfort.

This task is carried out with the firing equipment Claim 1 solved.

The firing device according to the invention has one Main burner, which has a main burner valve with a Fuel supply line is connected. The main burner is designed or operated so that at least one forms a glowing flame in some areas. The flame can at least one stationary (stationary) non-luminous (blue) area. Complementary or instead of of which a pilot burner can be provided, which with a Pilot burner valve also with the fuel supply line connected is. The pilot burner is a so-called blue burner, i.e. it burns with a non-glowing flame. Such a flame is understood to mean that some excess air was generated, so they didn't contains luminous particles such as soot or the like, but only weak blue lights up. On the pilot burner or the non-illuminating area of the main burner are one High voltage ignition device and a flame monitoring device arranged. At least the flame monitor has an element that is in the pilot light extends into it. The flame monitor is e.g. Ionisierungsfühler. This is isolated by a arranged electrode formed, which is in the pilot light extends. The hot and with a little excess of oxygen operated pilot flame or the corresponding flame section the main burner is not sooty and lasts thus the ionization sensor or other flame monitoring device soot-free. This way, incorrect ones Flame detections, such as those caused by a soot deposit caused on the ionization probe could be excluded. This is especially true if that Pilot burner valve remains open when the main burner valve is open, i.e. when the pilot flame is lit after the Main burner is not switched off. The flame of the pilot burner thus acts as a means of cleaning the flame monitoring device. From the glowing flame of the The main burner's soot is from the ionization sensor kept away. This way, an energy-saving High voltage ignition device for ignition application Find.

The pilot burner pilot light can burn continuously. The electrical ignitions are minimized reduced. However, this causes constant gas consumption and one, especially not in the open fireplace Desired constant source of ignition. It is therefore considered beneficial viewed the pilot burner with a high-voltage ignition device to combine that not only for one-time ignition of the pilot burner, but this one ignites only when necessary. This makes it possible to use the pilot burner valve during breaks in operation of the furnace conclude. The combustion device is to be put into operation be, by means of the high-voltage ignition device first the pilot burner ignited, which then the main burner can ignite. The high-voltage ignition device can have their own ignition electrode, which is in the area of the pilot burner and from this, like the flame monitoring device is kept clean. If desired, can the ionization sensor electrode with a High-voltage ignition electrode are combined into one element, which is also kept clean by the pilot light becomes. The pilot flame thus also keeps the spark gap High voltage ignition devices soot-free, which is the ignition safety improved or ensured even at low spark energies. Opposite a glow ignition device comes one High-voltage ignition device also very much with less Power off, so that battery operation is possible.

The burner control unit controls at least the main burner valve, the pilot burner valve and the high voltage ignition device. The automatic burner control can thus ensure that before opening the main burner valve always that Pilot burner valve is opened and here by means of the high-voltage ignition device always a pilot light first is ignited. In addition, the burner control is preferred connected to the flame monitor, the preferably one before opening the pilot burner valve carries out a short test run. For example, this is used to test whether the flame monitoring device detects a flame. If so, a malfunction must be assumed and there is no valve actuation and therefore no gas outlet. We flame detection through an ionization measurement, i.e. a measurement of one from an isolated Electrode made against the current flowing to the burner, a soot deposit can allow a leakage current, which then simulates an ionization current. In one in such a case, the burner control would ignite the Refuse burner. Maintenance would be what is displayed if necessary. In order to avoid such operational obstacles, the pilot flame holds the flame monitor clean by the formation of soot deposits is prevented.

The pilot burner valve and the main burner valve are preferably with energy-saving actuators, such as. Provide electromagnets that have only a low actuation output and only a very low holding current or one need low holding power. The actuation performance can be reduced by using an actuating magnet two actuating magnets are provided, the activated one after the other. The valve lift is thus open divided the strokes of two actuating magnets. The holding power can, for example, be applied by a thermocouple be the same with the further flame monitoring contributes or takes over. Does the burner control have that Pilot burner valve and the main burner valve opened and the burner control does not deliver a flame further current to the actuators of the pilot burner valve and of the main burner valve. This makes it possible to use the burner control for power supply with a battery supply to provide. A separate electrical connection is then For example, not required for the gas fireplace.

Occasionally, it is desired to add the gas flow to the To be able to set the main burner at least within limits. For this purpose, a modulation valve can be provided, the front or is arranged behind the main burner valve and one Throttling causes. For setting the modulation valve A suitable valve can be placed in different valve positions Handle, for example, a knob or a lever provided his. Alternatively, a reversible motor is provided which is operated by the burner control. is the motor is not energized, the modulation valve keeps the valve position once set at. The engine control of the modulation valve opens up the possibility of remote control the firing device. So can on a corresponding Gas fireplace the flame size, for example with a portable remote control can be set. In addition can a stationary operating module can be provided with the corresponding one Operations such as entering an ignition command a delete command or setting a desired one Temperature or flame size directly at the furnace is possible. The functions can also or alternatively provided on a remote control his. It is considered advantageous to use the remote control to provide a temperature sensor that the at the Remote control prevailing temperature with a set Compare target temperature and, if there are deviations are, corresponding control commands, for example Infrared communication link to a receiver of the burner control unit.

The system (the firing device) is preferred modular design, with an operating module initially a function module controls. This records inputs and controls the corresponding operation of the furnace (e.g. flame size, temperature, etc.). Start of operations, end of operations and functionality (ignition, flame monitoring, Main valve), on the other hand, is powered by a battery Controlled burner controls. This modular Structure allows adaptation to a wide variety of conditions, such as. Operation with or without pilot light, with or without fan, with or without mains connection, with or without remote control, etc. only by different Use of existing standard modules.

Further details of advantageous embodiment of the Invention are the subject of the drawing of the description or subclaims.

Fig. 1

eine Feuerungseinrichtung in Übersichtsdarstellung;

Fig. 2

die Feuerungseinrichtung nach Fig. 1 in ausschnittsweiser Übersichtsdarstellung;

Fig. 3

die Feuerungseinrichtung nach Fig. 1 in einer weiter schematisierten Übersichtsdarstellung und

Fig. 4

die Feuerungseinrichtung nach den Fig. 1 bis 3 in ihrem modularen Aufbau als Blockschaltbild.

An exemplary embodiment of the invention is illustrated in the drawing. Show it:

Fig. 1

a firing device in an overview;

Fig. 2

the firing device of Figure 1 in a fragmentary overview.

Fig. 3

1 in a further schematic overview and

Fig. 4

the firing device according to FIGS. 1 to 3 in its modular structure as a block diagram.

A firing device 1 is illustrated in FIG. 1, which, as is preferably the case, operated with gas becomes. Alternatively, a corresponding firing device but also with a liquid fuel, especially light fuel oil or the like. Be operated.

The firing device 1 is used to generate Flames 2 in the firebox, not illustrated Fireplaces, stoves or other, in particular Furnishing intended for living space heating and decoration. The flames 2 are glowing flames, i.e. she contain tiny, burning carbon particles and thus produce reddish or yellowish light with an at least partially continuous spectrum. A burner 3 is used to generate these flames a modulation valve 4 and a main burner valve 5 a gas supply line 6 is connected. During that Modulation valve 4 has several intermediate positions and throttle the gas flow to the burner 3 more or less the main burner valve 5 is an on-off valve, i.e. a shut-off valve with usually only two preferred positions, namely completely open or completely closed.

A valve actuator is assigned to the modulation valve 4, that in the present embodiment by a DC motor 7 is formed. This adjusts the valve stem of the modulation valve 4 when it is actuated in a way that the gas flow through the modulation valve 4 is more or less throttled to the burner 3. The DC motor 7 is connected via a control line 8 a control device 9 connected at a later point is explained.

The main burner valve 5 is also with a valve actuator 11 connected to the valve closure member of the Main burner valve 5 in the open or closed position transferred. The closed position is preferably de-energized Condition taken, for example. In a spring, the valve closure member against the corresponding valve seat clamps so that the gas supply to the burner 3 is shut off is. The main burner actuator 11 is, for example, a pull magnet device with two magnetic drives to be activated one after the other 11a, 11b, which via control lines 12 with the Automatic firing devices 9 are connected. In addition to the rather high-impedance Control windings connected to the control line 12 the main burner valve actuator 11 may be one have rather low-resistance winding 11c, which over a further control line 14 connected to a thermocouple 15 is. This is preferably in the area of an ignition flame 16 arranged, which starts from a pilot burner 17, when it is ignited. The pilot burner 17 is a burner a low fuel flow such an air flow admits that the flame 16 is blue, i.e. not bright is. It contains no thermally emitting carbon particles in significant numbers. Instead of the pilot burner the main burner 3 can then also, however existing only during the operation of the main burner 3 Form non-illuminating flame area 16.

The pilot burner 17 is in the vicinity of the main burner 3 arranged so that its flame 16 comes from the main burner 3 escaping gas can ignite before large gas accumulations have formed.

The pilot burner 17 is via a pilot burner line 18 connected to the gas supply line 6. In the pilot burner line 18, a pilot burner valve 19 is arranged, the can be opened or closed via an actuator. In the present exemplary embodiment, the magnetic drive forms 11a the pilot burner valve actuator. The winding 11c thus acts as a holding winding for both the pilot burner valve 19 as well as for the main burner valve.

Alternatively, the pilot burner valve 19 and the Main burner valve 5 as separate, independent from each other controllable valves be formed. It is therefore for both valves 5, 19 have a common drive; it is a combined valve that both the Gas supply to the pilot burner 17, as well as the gas supply the main burner 3 controls. It is in particular, the opening and closing of the Pilot burner valve and the main burner valve by a mechanical coupling inevitably synchronize or to bring about a certain chronological sequence.

The control device 9 is connected via a line 24 an ionization sensor 25, which is an isolated Has electrode 26, which in the region of the pilot flame 16 protrudes. If necessary, this electrode 26 can also be used as an ignition electrode serve and with the pilot burner 17 or one, not further illustrated, counter electrode a spark gap establish. Alternatively, however, a separate, Ignition electrode not shown here provided be a spark gap with a counter electrode forms. A separate, electrical can be used as the counter electrode isolated electrode, an electrode with the Pilot burner 17 or the main burner 3 is connected or the pilot burner 17 itself or another metal element serve.

The control device 9 is battery-powered. she takes over the control of the valve actuator 11 and the DC motor 7 and the generation of ignition sparks the pilot burner 17 and the flame monitoring by means of Flame monitoring device 25. To operate the Control device 9 serves an operating module 28, which at least Control elements for switching the firing device on and off 1 and, if necessary, other controls, e.g. for Have regulation of flame size.

The firing device 1 described so far works as follows:

It is initially assumed that the Firing device 1 is not in operation. The control device 9 does not supply excitation currents to the valve actuator 11 or to the DC motor 7. It is de-energized itself or is in battery standby mode.

If the main burner 3 is to be ignited, a corresponding one is used Command given via the control module 28. This now activates one contained in the control device 9 Automatic burner control 9a, which first the ionization sensor 25 queries. As part of this query, the ionization sensor 25 applied with a voltage of about 100 volts. Exceeds that through line 24 and the ionization sensor 25 flowing current a minimum limit, The burner control unit 9a rejects the start attempt and delivers a corresponding error signal to the control module 28. This can then display a fault signal, for example. prompts for maintenance. However, if no leakage current is found, generates the automatic burner control 9a on the element 26 or the separate spark gap mentioned above in the area the mouth of the pilot burner 17 in a predetermined time sequence Flashovers. Opens at the same time or just before the automatic burner control 9a by energizing the magnetic drive 11a, the pilot burner valve 19, so that the pilot burner 17 Receives gas. The automatic burner control 9a initially stops the main burner valve 5 closed.

Performs the opening of the pilot burner valve 19 and Operation of the spark gap before the pilot burner muzzle 17 for igniting the pilot flame 16, the automatic burner control detects 9a this via the ionization sensor 25 and stops the Operation of the spark gap and gives the further start of the Brenner 3 free. For this purpose, it excites the magnetic drive 11b, which the main burner valve 5 opens. The pilot flame 16 causes now the ignition of the flowing out of the pilot burner 3 Gas and in addition the heating of the thermocouple 15, this thus begins a holding current for the winding 11c generate so that the pilot burner valve 19 and the main burner valve 5 remain open. After a fixed one The burner control unit 9 can generate the excitation currents for a period of time switch off the magnetic drive 11a, 11b, the thermal current the thermocouple 15 also the magnetic drives 11a, 11b holds in tightened condition. As an alternative to control the burner control can operate with a fixed time span 9a also monitor the thermal current and the excitation of the Only give up magnetic drives 11a, 11b when there is sufficient Thermal current 15 is generated or switched off, if it does not appear after a period of time, malfunction to avoid.

However, the automatic burner control 9a sets after a finite one Number of ignition attempts (arcing at the Spark gap) or after a definable ignition time no ionization fixed to the ionization sensor 25 can be assumed that no pilot light has ignited. The Automatic burner control 9a then goes into a locked state over, it closes the pilot burner valve 19 (the main burner valve was closed anyway) and reports a corresponding Error signal to the operating module 28.

If the main burner 3 is ignited, the size of the Flames 2 due to the setting of the modulation valve 4 established. If the valve position is to be changed, this can be set on the operating module 28. This delivers via one contained in the control device Function module a corresponding signal to the DC motor 7 to adjust it. Alternatively or additionally can a manual control device on the modulation valve 4 be provided.

Another stage of expansion of the furnace 1 contains a remote control, as can be seen, for example, from FIG. 2 is. The burner control 9 is here with one Remote control receiver 31 connected, for example as an infrared receiver is trained. The remote control receiver 31 is a handy remote control 32 assigned to one Contains infrared transmitter 33. This is set up to appropriately coded command signals to the remote control receiver 31 to send. In the remote control, all relevant Controls, such as a switch for the Switch on and switch off the fireplace or the furnace 1, a control for zooming or reducing the flame 2 or for setting one Room temperature should be provided. For example, a temperature sensor 33 housed in or on the remote control 32 his. A potentiometer 34 or otherwise Manually operated setting element serves to pre-select one desired temperature. A comparator 35 is provided that delivered by the temperature sensor 33 temperature signal with that supplied by the setting device 34 Compare target signal for temperature. exceeds the deviation is a fixed amount a corresponding correction signal to the transmitter 33 given, then one for enlargement or reduction correction signal carrying the flame to the receiving device 31 sends. The burner control accordingly the modulation valve 4 via the DC motor 7 to increase or decrease the flame 2.

The furnace is for better understanding 1 in FIGS. 3 and 4 in their distribution on different Modules (burner control 9a, function module 9b, valve module) illustrated again as a block diagram. additionally to the valves described so far is a main gas valve 37 provided that serves as a safety valve and all other valves 5, 19, 4 is upstream. The Main gas valve 37 is open when the main burner 3 or the pilot burner 17 should be ignited or operated and it is closed when neither the main burner 3 nor the pilot burner 17 should work. The main gas valve 37 is actuated by the automatic burner control 9a via magnetic drives. The magnetic drives include several magnetic coils 37a, 37b, 37c. The solenoids 37a, 37b are with the automatic firing devices 9a to be opened by it. The solenoid 37c is a holding coil, which with the Thermocouple 15 is connected. During breaks, i.e. when the main burner 3 is extinguished, the burner control closes 9 both the main burner valve 5 and that Pilot burner valve 19 and the main gas valve for safety 37. This can be done by corresponding single or multiple negatives Pulses occur at the solenoids 37a, 37b, 11a, 11b. Alternatively, the thermal current can be interrupted. This means that when the firing device 1 is not in operation, none at all There is a flame and no gas escapes.

Fig. 4 gives an overview of the firing device 1 and its modular structure as well as the ones created by it Possible combinations again. It illustrates also that besides a battery 38 as Voltage source for the operating power supply of the furnace 1, a power supply 39 can serve if desired becomes. A power supply 39 takes the necessary Operating energy of the electrical part of the furnace 1 a public power grid. It can also operate a fan 41, for example around the firing device 1 fresh air or exhaust gases suck. In addition, a pressure switch 42 can be provided be the essential for the operation of the firing device 1 Bridge, such as the gas pressure or the negative pressure monitored in an exhaust stack and in the event of a fault Continued operation of the furnace is prevented.

A firing device 1 has a pilot burner 17 and a main burner 3 and an automatic burner control 9 on the operation of the pilot burner 17 of the main burner 3 and a corresponding ignition device 25 controls. In front the ignition of the main burner 3 is always the first Pilot burner 17 ignited. When not in use, both Burner extinguished. A is used to ignite the pilot burner 17 Spark gap and for monitoring the pilot flame is used Flame monitoring device, for example an ionization sensor 25. The pilot light is a blue (not glowing) Flame 16, the electrodes of the spark gap and / or of the ionization sensor 25 keeps clean. The main burner 3 can, on the other hand, one with decorative flames (blazing yellow) burning gas burner or a burner for other Be fuel.

Claims (14)

Firing device (1), in particular gas-operated firing device, with a main burner (3) which is connected to a fuel supply line (6) and which is supplied with fuel and air in such a way that a luminous flame (2) forms, with a main burner valve (5) which is connected to a main burner actuator (11) and is arranged in the fuel supply line (6) in order to enable or shut off the fuel flow directed to the main burner (3) in a controlled manner, with a device (17) for generating a non-luminous flame (16), with a flame monitoring device (25) which is arranged on the device (17) in the region of the non-illuminating flame (16), with a high-voltage ignition device (25a) which has a spark gap which is arranged on the device (17) in the region of the non-illuminating flame (16), and with a control device (9) which is connected at least to the main burner actuator (7) of the main burner valve (5), the flame monitoring device (25) and the high-voltage ignition device (25a). Firing device according to claim 1, characterized in that the device (17) is a pilot burner (17) which is connected via a pilot burner line (18) and a pilot burner valve (19) to the fuel supply line (6) which is connected to a pilot burner Actuator (11a) is connected and arranged in the pilot burner line (18) in order to release or shut off the fuel directed to the pilot burner (17) in a controlled manner. Furnace device according to claim 1, characterized in that the device (17) is formed by a part of the main burner (3) which is designed and / or operated in such a way that the flame (2) which forms has areas in which excess fuel predominates, so that a glowing flame is formed and that at least one other area exists in which there is excess air, so that the non-glowing flame (16) is formed here. Firing device according to claim 1, characterized in that the control device (9) is of modular construction and has an automatic burner control (9a) for controlling the ignition of the main burner (3) and for flame monitoring, and a function module which in particular for regulating the flame size of the flame (2 ) of the main burner (3) is provided. Firing device according to claim 1, characterized in that the control device (9) is additionally connected to a main gas valve (37) which is arranged as a main shut-off valve in the flow direction before all other valves in the fuel supply line (6). Firing device according to claim 1, characterized in that in the fuel supply line (6) a modulation valve (4) which can be actuated by a modulation actuator (7) is provided, via which the gas flow directed to the main burner (3) can be regulated, and in that the modulation actuator is connected to the function module (9b). Firing device according to Claim 4, characterized in that the pilot burner actuator (21) is connected to a thermocouple (15) which is arranged in the non-illuminating flame (16) and whose thermocurrent keeps at least the main gas valve (37) open. Firing device according to claim 1, characterized in that the flame monitoring device (25) has an ionization sensor (26) which is arranged in the region of the non-illuminating flame (16) in order to detect on the basis of an ionization current whether a flame (16, 2) is present is. Firing device according to claim 5, characterized in that the actuators of the main burner valve (5) and the main gas valve (37) each have two windings (37a, 37b) for gradual opening and a holding winding (37c), and that the control device (9) and the two windings of the valves (5, 37) battery (38) is fed, while the holding winding is fed by a thermocouple. Firing device according to claim 6, characterized in that the functional module (9b) is connected to the automatic firing device (9a) and to an operating module (28), the operating module (28) controlling the functional module (9b) and the functional module (9b) Controls the automatic firing device (9a), which controls the ignition, monitoring and extinguishing of the main burner (3). Firing device according to claim 1, characterized in that the control device (9) contains a control device (32, 35) which is connected to a temperature sensor (33). Furnace device according to claim 1, characterized in that the control device (9) is connected to a remote control receiver (31) and that the remote control receiver (31) is assigned a preferably portable remote control transmitter (32). Furnace device according to claims 10 and 11, characterized in that the remote control transmitter (32) is provided with a temperature sensor (33) and a temperature selection device (34), both of which are connected to the control device. Control device for a combustion device, characterized in that the control device (9) has a burner control (9a) and a function module (9b), the burner control being assigned the functional test, ignition, flame monitoring and shutdown, and the function module being the setting of Flame size is assigned.

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