EP0341323B2 - Dispositif de régulation pour brûleur à gaz - Google Patents

Dispositif de régulation pour brûleur à gaz Download PDF

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Publication number
EP0341323B2
EP0341323B2 EP88107390A EP88107390A EP0341323B2 EP 0341323 B2 EP0341323 B2 EP 0341323B2 EP 88107390 A EP88107390 A EP 88107390A EP 88107390 A EP88107390 A EP 88107390A EP 0341323 B2 EP0341323 B2 EP 0341323B2
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EP
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Prior art keywords
circuit
bridge
flow
gas
voltage
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EP88107390A
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German (de)
English (en)
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EP0341323A1 (fr
EP0341323B1 (fr
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Derk Vegter
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Honeywell BV
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Honeywell BV
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Priority to DE8888107390T priority Critical patent/DE3870611D1/de
Priority to EP88107390A priority patent/EP0341323B2/fr
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/022—Regulating fuel supply conjointly with air supply using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N2005/181—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N2005/185—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/12—Measuring temperature room temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • F23N2233/08—Ventilators at the air intake with variable speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/16—Fuel valves variable flow or proportional valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel

Definitions

  • the invention relates to a flow control device for maintaining a predetermined gas / air ratio of the gas and air quantities supplied to the gas burner of a heating device via lines of predetermined cross section.
  • the burner heating the air or water must be supplied with a quantity of fuel that corresponds to the heat requirement. Since the burner only works optimally with a given air / gas ratio, i. H. the fuel burns completely, the amount of combustion air must change accordingly with the change in the amount of gas supplied. Control devices for these purposes are known.
  • GB-B 12 35 891 shows a control device that can be controlled by a temperature sensor for a gas-fired water or air heater with a control valve for the supply of heating gas and a control element that is controlled in the same direction for the supply of the combustion air.
  • a spring-loaded diaphragm actuator is connected to the outlet line leading to the burner of the gas control valve controlled by the temperature sensor, which drives an air flap in the combustion air supply duct.
  • the diaphragm drive influences the speed of the blower motor for supplying the combustion air via a brake.
  • a control device serving the same purpose, in which a servo pressure controller compares the pressure at the outlet of the gas control valve or at the outlet of the air quantity actuator with a setpoint determined by the temperature sensor and with its output pressure both the drive of the gas control valve and controls that of the air volume actuator. In both cases, a predetermined gas / air ratio of the gas / air mixture supplied to the burner is therefore maintained.
  • the gas valve is controlled by a temperature controller, for example a room thermostat or boiler water thermostat, in such a way that a quantity of gas required to generate the required amount of heat is fed to the burner.
  • a temperature controller for example a room thermostat or boiler water thermostat
  • an oxygen or carbon dioxide sensor is arranged in the flue gas outlet, which uses the combustion products to determine whether the amount of combustion air required to achieve optimal combustion is fed to the burner. If this is not the case, its output signal changes the position of an air flap arranged in the air duct or the speed of a fan providing the combustion air via a controller.
  • the attachment of such a smoke gas sensor is often difficult if it is required that it provide a reliable output signal which characterizes the actual state of the combustion.
  • such sensors in the flue gas duct are exposed to severe contamination and possibly corrosion. It is therefore more favorable to maintain optimal combustion conditions by automatically adjusting the amount of combustion air to the amount of gas supplied to the burner.
  • the object of the invention is to provide a flow control device suitable for this purpose, which measures and adjusts the actual flow rates.
  • the pneumatic systems mentioned at the beginning do not provide for such a measurement of the mass flows, but only an adaptation of the respective position of the actuators.
  • the invention is intended to provide a control device which can be easily adapted to different operating conditions.
  • Conventional sensors should be used to measure the flow rates, which are easy to attach and reliable in the corresponding air and gas lines and which have as little impact as possible on the flow in the lines.
  • Such sensors are available in the form of heated resistors, which are cooled by the volume flow depending on its current strength.
  • EP-A 00 21 291 shows a mass flow meter in which the flowing medium is guided past two current-carrying electrical conductors.
  • US-A 44 78 076 shows a flow meter in which a first temperature-dependent resistor, a heating resistor and a second temperature-dependent resistor are arranged one behind the other in the flow channel in the direction of flow, all of which are attached to a semiconductor substrate using thin-film technology.
  • the measuring resistor installed upstream from the heater is cooled by the mass flow, and the measuring resistor arranged downstream from the heater is heated by the partial flow heated by means of the heater.
  • the measuring resistors are arranged in a bridge circuit, as in the case of the aforementioned flow meter, so that the voltage across the bridge diagonal is a measure of the temperature difference caused by the mass flow.
  • a circuit arrangement evaluating the differential voltage of the bridge circuit with the measuring resistors is shown in FIG. 5 of US Pat. No. 4,478,076.
  • Cascade control devices consisting of a main controller and a downstream auxiliary controller acting on the actuator are known per se.
  • the book "Control technology for heating and ventilation engineers" by H. Schrowang, Düsseldorf 1976, on page 194 shows the series connection of two electronic temperature controllers with switching outputs with the interposition of a motorized setpoint adjuster.
  • Both the main controller and the auxiliary controller each consist of a measuring bridge, a downstream amplifier, a subsequent trigger circuit and a relay switching element controlled by this.
  • a main setpoint is fed to the main controller as input variables and the output signal of a first temperature sensor as an actual value. With its output signal via a reversible miniature motor, it controls on the one hand a feedback potentiometer, the output signal of which acts back on the bridge circuit of the main controller, and on the other hand a second potentiometer, which specifies an auxiliary setpoint as the reference variable for the auxiliary controller connected in the cascade.
  • the auxiliary controller compares this reference variable with the output signal of a second temperature sensor and uses the output signal of its relay switching element to control a motor valve with feedback potentiometer, the feedback signal generated by this potentiometer, as with the main controller, being traced back to the bridge circuit of the auxiliary controller.
  • the book mentioned shows a cascade control device in which the electrical output signal of the main controller is directly fed back to the input of the amplifier in the main controller in the form of an I feedback without the interposition of a motor-operated potentiometer, and on the other hand also as a reference variable signal with a feedback provided amplifier of the auxiliary controller is fed.
  • a burner heats the heat exchanger 2 of a water heater and is supplied with gas via line 3 and via line 4 with the necessary combustion air.
  • a gas safety valve 6 and a gas control valve 7 are switched into the gas line 3 between the gas connection 5 and the burner 1.
  • a thermocouple 8 monitors the presence of the flame on the burner 1 and keeps the safety valve 6 open only as long as such a flame is present.
  • the quantity of gas supplied to the burner 1 is regulated with the control valve 7.
  • the required combustion air is provided by a blower 8, the speed of which can be changed with the aid of a speed controller 9.
  • a temperature sensor 10 measures the temperature in a room to be heated or in a water boiler and sends a signal corresponding to this temperature to the thermostat 11.
  • the flow sensor 13 in the gas line 3 With the help of the flow sensor 13 in the gas line 3, the gas flow and thus with a known line cross-section the amount of gas delivered per unit of time, i.e. H. the gas flow rate is measured, while a corresponding flow sensor 14 in the air line 4 measures the combustion air flow rate.
  • the control device 15 receives from the flow sensor 14 a signal corresponding to the amount of air conveyed and changes the valve position of the control valve as a function thereof until the flow sensor 13 in the gas line 3 indicates that the amount of gas associated with the amount of air conveyed is supplied to the burner 1.
  • the amount of gas is therefore tracked to the amount of air.
  • the arrangement shown has the advantage that the gas valve 7 is only opened when there is an air flow in the air line 4, that is, the fan 8 is working properly. This prevents gas from reaching burner 1 without a simultaneous supply of air and, in the absence of an ignitable mixture, the gas passes unburned from combustion chamber 16 into the chimney or an explosive mixture forms in the combustion chamber.
  • the asymmetrical bridge circuit shown in FIG. 2 for measuring a mass flow is fed from a DC voltage source 20 and contains two identical temperature-dependent resistors W1 and W2 of 1 kOhm each, for example. Both temperature-dependent resistors are connected to different supply voltages.
  • the right temperature-dependent resistor W2 is connected in series with two resistors R1 and R2 to the full supply voltage U of the DC voltage source. Resistor R1 has a value of 1200 ohms and resistor R2 has a value of 133 ohms.
  • the left temperature-dependent resistor is in series with another fixed resistor R3, which is 1 kOhm, for example.
  • this part of the bridge is not supplied with the full supply voltage U, but rather with the voltage at the tap 21 of the voltage divider, consisting of the resistors R4 and R5.
  • Resistor R4 has a value of 90 k ohms and resistor R5 has a value of 10 k ohms.
  • the left branch of the bridge circuit with the resistors W1 and R3 is connected to the tap 21 via an isolating amplifier V1. Because of the different connections to the supply voltage U, the temperature-dependent resistor W2 flows through a current 7.5 times higher in this example than the temperature-dependent resistor W1 fed with only one tenth of the supply voltage.
  • the resistor W2 consumes approximately 56 times the power compared to the power consumption of the temperature-dependent resistor W1. So there is a temperature difference between the two resistors.
  • the supply voltage U of the DC voltage source 20 is dimensioned such that the resistance of the resistor W2 rises to 1333 ohms, provided that the temperature-dependent resistors W1 and W2 are not cooled by a mass flow. Nevertheless, the two potentials (-) and (+) of the differential amplifier V2 have the same potentials as long as none of the temperature-dependent resistors W1 and W2 is cooled by a mass flow.
  • the input (-) is namely directly connected to the diagonal point 22, while the input (+) is connected to the tap 23 of the voltage divider consisting of the resistors R1 and R2 and consequently only a voltage equal to one tenth of that at the other diagonal point 24 standing voltage. As long as there is no mass flow, the amplifier V2 consequently does not deliver an output signal.
  • the temperature-dependent resistors W1 and W2 of the bridge circuit can have a positive temperature coefficient (PTC) or a negative coefficient (NTC).
  • PTC positive temperature coefficient
  • NTC negative coefficient
  • a flow meter in a bridge circuit can also be used, as described in the above-mentioned US Pat. No. 4,478,076. It also delivers an output signal proportional to the flow velocity. If this output signal is fed back to the bridge in such a way that the bridge supply voltage is changed until bridge equilibrium is restored, the current required to generate the bridge balance is a measure of the previous bridge imbalance, i. H. for the flow velocity.
  • the bridge circuit regardless of the type of temperature-dependent resistors and the structure of the bridge circuit itself, provides an output signal corresponding to the flow rate.
  • the present invention creates a control device for maintaining a predetermined gas / air ratio by the measuring resistors of such a bridge circuit are exposed once to the air flow and once to the gas flow.
  • 3 shows an exemplary embodiment of such a circuit arrangement.
  • the control device 15 shown in FIG. 3 comprises two bridge circuits BR1 and BR2, of which the bridge circuit BR1, as explained above with reference to FIG. 2, contains two temperature-dependent resistors W1 and W2, which are exposed to the air flow in the air supply line 4 to the combustion chamber 16 to measure the combustion air flow.
  • the other bridge circuit BR2 has practically the same structure and also contains two temperature-dependent resistors W3 and W4, which are exposed to the gas flow in the gas line 3 and measure the gas throughput to the burner 1.
  • the cross section of the air and gas supply lines 4 and 3 is assumed to be known, so that the flow rate is a measure of the throughput.
  • Both bridge circuits BR1 and BR2 are constructed essentially the same and are fed with the same voltage U25 on line 25. Insofar as the components of the bridge circuit BR1 match the circuit according to FIG. 2, the same reference numerals are used.
  • the control device 15 is supplied with an alternating voltage of, for example, 24 V at the terminals 26 and 27 as the supply voltage. With the help of a rectifier bridge circuit consisting of diodes D1 to D4 and a filter capacitor C1, a direct voltage U28 is obtained on line 28.
  • a voltage divider consisting of a resistor R7 of, for example, 3.3 kOhm and a Zener diode Z1 with a breakdown voltage of, for example, 24V, together with a transistor T1 and a diode D5, supplies a stabilized DC voltage U of, for example, 22V via the resistor R6 for supplying the two bridge circuits BR1 and BR2.
  • the bridge circuit BR1 supplies, as previously explained, a differential voltage at its diagonal points 22 and 23, which after division over the Voltage divider R1, R2 at its tap 23 is fed to the two inputs of amplifier V2. This is supplemented with the aid of a capacitor C2 of, for example, 4.7nF and a resistor R8 of, for example, 10kOhm to form a relaxation oscillator. Its pulse-shaped output voltage is amplified by means of the transistor pair T2, T3 and superimposed on the line 25 via a capacitor C3 of, for example, 10 ⁇ F and a resistor R10 of, for example, 47 ohms. The voltage curve on line 25 is shown in FIG. 4.
  • This voltage is composed of a DC voltage U of, for example, 22V and a superimposed pulse voltage of also 22V.
  • the pulse voltage only arises when the temperature-dependent resistors are cooled by a mass flow.
  • the line 25 carries only the direct voltage component U, as supplied by the direct current supply circuit D1 to D4, C1 via the voltage regulator R7 Z1, T1, D5.
  • the pulse-width-modulated pulse voltage which is automatically modulated by the relaxation oscillator, ensures that the bridge supply voltage is changed until bridge equilibrium is restored.
  • the bridge circuit BR2 used to measure the gas throughput also contains a capacitor C6 of, for example, 1 nF in the left branch, a resistor R11 of, for example, 953 ohms and a decoupling resistor R12 and in the right branch the series connection of three resistors R13 of for example 1200 ohms, R14 of for example 10 ohms and R15 of for example 120 ohms.
  • a third amplifier V3 connected as an integrating amplifier with the aid of a feedback capacitor C4 of, for example, 22 ⁇ F is connected to one diagonal point 29 with its non-inverting input (+) and to the other diagonal point with its inverting input (-) via a resistor R16 of, for example, 47kOhm 30 of the second bridge circuit BR2 connected. Its due to the filter effect of the left branch triangular output signal U31 on line 31 is fed to the non-inverting input (+) of the fourth operational amplifier V4 serving as a comparator, while its inverting input (-) to the tap 32 between the resistors R14 and R15 im right bridge branch of the BR2 bridge is connected. From there, the inverting input receives a pulse-shaped signal U33.
  • a square-wave signal U34 modulated in pulse length is produced at output 34 of comparator V4, the frequency of which corresponds to that of the pulse voltage on line 25.
  • This pulse-length-modulated signal U34 reaches the base of a transistor T4 via a resistor R17 of, for example, 1 kOhm, the collector of which is connected to the base of a further transistor T5.
  • the transistor T4 is connected in series with a resistor R18 of, for example, 3.3 kOhm between the DC voltage supply line 28 and reference potential 35.
  • a transistor T6 which, together with two further transistors T7 and T8, lies in the charging circuit for capacitor C5 of, for example, 22 ⁇ F.
  • This charging circuit leads from line 28 via power stage T7 to T8 and diode D6 to capacitor C5, while in its discharge circuit when diode D6 is blocked, excitation winding 37 of gas valve 7 and transistor T5 are switched on.
  • an inertial amplifier V3 can be used instead of the capacitor C6.
  • the bridge BR1 at the output of the amplifier V2 does not generate a pulse-shaped signal and the bridge BR2 at the output of the amplifier V3 does not generate a triangular signal.
  • a pulse-length-modulated pulse sequence is also missing on line 34, so that transistor T4 remains blocked and capacitor C5 is charged via power stages T6 to T8 and diode D6, but is not discharged via transistor T5 and consequently also no current to open of the gas valve 7 can deliver.
  • the fan 8 is started via the speed controller 9 and thus an air flow in the Air supply line 4 generated, the resistors W1 and W2 of the air flow sensor 14 are cooled by this air flow, to an extent dependent on the strength of the air flow.
  • a differential voltage arises between the bridge points 22 and 23, so that the amplifier V2 connected to it begins to oscillate, with a frequency that corresponds to the level of the bridge differential voltage and thus depends on the strength of the air flow.
  • This pulse-shaped voltage (cf. upper curve in FIG.
  • the heat output of the right resistor W2 is, for example, 56 times greater than that of the left resistor W1 - that comes from the bridge circuit , the downstream oscillator and the pulse-shaped supply voltage generated by it for the bridge control loop to an equilibrium state when a predetermined temperature difference occurs between the two resistors W1 and W2, namely the same as in the absence of air flow.
  • the frequency of the pulse sequence changes, for example in a range from 500 Hz to 3 kHz, while the pulse width remains constant and is, for example, between 100 and 200 us.
  • the bridge equilibrium also shifts there depending on the frequency of this pulse train and thus on the measured air flow.
  • the bridge balance can be restored on the one hand by changing the resistance values of the temperature-dependent resistors W3 and W4 and on the other hand by changing the operating voltage supplied to the bridge. Since the supplied operating voltage is predetermined by that of the bridge BR1, only a change in the resistance values of the resistors W3 and W4 arranged in the gas stream remains, for which purpose the gas valve 7 must be opened accordingly.
  • the voltage at the bridge diagonal points 29 and 30 of the bridge BR2 measuring the gas flow is fed to the two inputs of the integrating amplifier V3, which generates a triangular voltage which changes in the rhythm of the pulse sequence U25.
  • the DC voltage level of the delta voltage V31 is the time integral of the voltage difference at the diagonal points 29 and 30.
  • the delta voltage U31 reaches the non-inverting input (+) of the comparator V4. Its inverting input (-) is connected via line 33 to the tap 32 in the right bridge branch W4, R13, R14, R15.
  • the triangular voltage is therefore compared with the impulse voltage present there, which is correspondingly divided by the voltage divider.
  • a pulse begins at the output 34 of the comparator V4, which stops when the triangular voltage drops below the pulse voltage.
  • a pulse sequence V34 modulated in length as a function of the DC voltage level of the delta voltage is thus obtained at the input of transistor T4 (cf. FIG. 5).
  • Transistor T4 is switched on during the duration of the pulse and is blocked during the pulse pause.
  • the transistor T4 is blocked, there is no voltage drop across the resistor R18, as a result of which the power stage T6 to T8 is connected through the resistor R18 and the capacitor C5 is charged via the diode D6 from the direct voltage on the line 28.
  • the power stage T6 to T8 is dimensioned such that the capacitor is charged even with the shortest possible pulse duration. As long as transistor T4 is blocked, transistor T5 is blocked. If, however, the transistor T4 switches on, the power stage T6 to T8 blocks and the transistor T5 switches through. The capacitor C5 can then discharge via the excitation winding 37 of the gas valve and the transistor T5. The current flowing through the excitation winding opens the valve 7, whereby gas flows via the line 3 to the burner 1 and thereby cools the temperature-dependent resistors W3 and W4 of the gas flow sensor 13. The desired bridge balance of the BR2 bridge is thus restored.
  • the bridge BR2 with the downstream integrator V3, the comparator V4 and the pulse width-dependent energy supply to the gas valve 7 thus forms a second self-balancing control loop. This is used as the reference variable for the output signal of the first control loop, consisting of the bridge BR1, the oscillator V2 and the supplied by this bridge supply voltage U25 in the form of a pulse-shaped supply voltage dependent on the air flow.
  • the use of the bridge measuring the air flow as a reference variable has the advantage that the gas valve can only be opened if an air flow is present. This increases the intrinsic safety of the control device.
  • the resistors W1 and W2 could also be arranged in the gas flow and the resistors W3 and W4 in the air flow and an air flap could be provided instead of a gas valve 7.
  • symmetrical bridge circuits with PTC or NTC resistors can also be used, as is known, for example, from US Pat. No. 4,478,076.
  • the change in the bridge supply voltage as a function of the primary flow to be measured can be done by pulse amplitude modulation, pure amplitude modulation or pulse width modulation.
  • the control of the actuator in the secondary flow for example the gas valve, can also be carried out by changing the amplitude, frequency or pulse ratio of a pulse-shaped excitation current or by changing the current strength of a direct current.
  • the interaction of the two bridge circuits influenced by the two flow rates with the actuator in the secondary flow rate can also be realized in a different way with conventional circuitry. It is important that a first flow sensor in the primary flow generates a reference variable for a controller, which acts on an actuator for the secondary flow and receives as a further input variable a signal dependent on the flow in the secondary flow. In the present case, both bridges are part of self-balancing control loops. This increases the reliability and stability of the control device. Another advantage is that the circuit described is intrinsically safe, i.e. if individual components fail, the excitation winding 37 is switched off safely.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measuring Volume Flow (AREA)
  • Regulation And Control Of Combustion (AREA)

Claims (6)

  1. Dispositif de régulation de débit pour le maintien d'un rapport quantitatif gaz/air prédéterminé des quantités de gaz et d'air amenées au brûleur à gaz d'un dispositif de chauffage par l'intermédiaire de canalisations possédant une section transversale prédéterminée, caractérisé par
    a) un premier circuit électrique de régulation à auto-équilibrage (BR1, T2, T3, C3, 25), auquel est amené (en W1, W2), en tant que signal de valeur réelle, un signal qui dépend d'un premier écoulement quantitatif (par exemple du courant d'air) et dont le signal de sortie (U₂₅) est utilisé d'une part pour l'équilibrage du premier circuit de régulation et d'autre part comme grandeur pilote pour un second circuit de régulation (BR2, V3, V4, 7) ;
    b) un dispositif de mesure d'écoulement contenu dans le premier circuit de régulation et constitué en tant que premier circuit en pont (BR1) comportant des résistances (W1, W2), qui dépendent de la température, pour le premier écoulement quantitatif ;
    c) un second circuit de régulation à auto-équilibrage, auquel sont amenés (en W3, W4), en tant que signal de valeur réelle, un signal qui dépend du second écoulement quantitatif (par exemple du courant de gaz) et, en tant que valeur de consigne, la grandeur pilote et dont le signal de sortie agit, par l'intermédiaire d'une vanne (7), sur le second écoulement quantitatif ;
    d) un dispositif de mesure d'écoulement contenu dans le second circuit de régulation et constitué en tant que second circuit en pont (BR2) comportant des résistances (W3, W4), qui dépendent de la température, pour le second écoulement quantitatif ;
    e) un circuit d'alimentation en courant continu (D1-D4, C1, Z1, T1) pour les deux circuits en pont (BR1, BR2) ;
    f) un générateur de courant (V2, C2) commandé par le signal de sortie du premier circuit en pont (BR1) et servant à produire un courant supplémentaire d'alimentation, dont l'intensité dépend du premier écoulement quantitatif mesuré, pour les deux circuits en pont (BR1, BR2) ;
    g) un amplificateur opérationnel (V2), contenu dans le générateur de courant et aux deux entrées duquel une tension, qui correspond à la différence de tension aux points diagonaux (22, 23) du premier circuit en pont (BR1), est amenée de telle sorte que le courant supplémentaire d'alimentation produit par le générateur de courant, maintient constante cette différence de tension même dans le cas du premier écoulement quantitatif variant ;
    h) un circuit de commande (V3, V4, T4), qui est raccordé aux points diagonaux (29, 30) du second circuit en pont (BR2), pour la vanne (7) commandant le second écoulement quantitatif.
  2. Dispositif de régulation selon la revendication 1, caractérisé en ce que le générateur de courant (V2, C3, C2, C3) est un générateur d'impulsions, dont la fréquence de récurrence des impulsions dépend du premier écoulement quantitatif.
  3. Dispositif de régulation selon la revendication 1 ou 2, caractérisé en ce que les deux circuits en pont (BR1, BR2) sont raccordés d'une part par l'intermédiaire d'un régulateur de tension commun (T1) et d'une diode de blocage du courant de retour (D5), au circuit d'alimentation en courant continu (D1-D4, C1) et d'autre part à la sortie (R10) du générateur de courant (V2, C3, T3, T2).
  4. Dispositif de régulation selon l'une des revendications 1 à 3, caractérisé en ce que le circuit de commande (V3, T3, T4) prévu pour la vanne (7) est constitué en tant que modulateur de largeurs d'impulsion et que la vanne est constituée sous la forme d'une vanne magnétique.
  5. Dispositif de régulation selon la revendication 4, caractérisé en ce que le circuit de commande contient un transistor de commande (T4) et au moins deux transistors de puissance (T5;T6,T8) passant alternativement à l'état conducteur , dont l'un (T6-T8) est situé dans le circuit de charge et dont l'autre (T5) est situé dans le circuit de décharge d'un condensateur (C5), qui alimente l'enroulement d'excitation (37) de la vanne magnétique (7).
  6. Dispositif de régulation selon la revendication 4 ou 5, caractérisé en ce que le circuit de commande comprend :
    a) un amplificateur intégrateur (V3) raccordé, par ses deux entrées, aux points diagonaux (29,30) du second circuit en pont (BR2);
    b) un comparateur (V4) qui est raccordé, par l'une (+) de ses entrées à la sortie de l'amplificateur intégrateur (V3) et par son autre entrée (-) à la prise (32) d'un diviseur de tension (R14,R15) branché entre l'entrée (-) de l'amplificateur intégrateur (V3) et le potentiel de référence (35);
    c) un circuit d'attaque (T4-T8) raccordé à la sortie (34) du comparateur (V4) et servant pour la production de courant d'excitation pour la vanne magnétique (7).
EP88107390A 1988-05-07 1988-05-07 Dispositif de régulation pour brûleur à gaz Expired - Lifetime EP0341323B2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE8888107390T DE3870611D1 (de) 1988-05-07 1988-05-07 Regeleinrichtung fuer gasbrenner.
EP88107390A EP0341323B2 (fr) 1988-05-07 1988-05-07 Dispositif de régulation pour brûleur à gaz

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88107390A EP0341323B2 (fr) 1988-05-07 1988-05-07 Dispositif de régulation pour brûleur à gaz

Publications (3)

Publication Number Publication Date
EP0341323A1 EP0341323A1 (fr) 1989-11-15
EP0341323B1 EP0341323B1 (fr) 1992-04-29
EP0341323B2 true EP0341323B2 (fr) 1995-11-15

Family

ID=8198956

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88107390A Expired - Lifetime EP0341323B2 (fr) 1988-05-07 1988-05-07 Dispositif de régulation pour brûleur à gaz

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Country Link
EP (1) EP0341323B2 (fr)
DE (1) DE3870611D1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19853573A1 (de) * 1998-11-20 2000-05-25 Bosch Gmbh Robert Heizgerät
DE10026002A1 (de) * 2000-05-25 2001-12-06 Bosch Gmbh Robert Vorrichtung zum Überwachen eines Gebläses in einem Gasheizgerät
AT412367B (de) * 2002-09-02 2005-01-25 Vaillant Gmbh Verfahren zur anpassung der gebläsedrehzahl eines gebläseunterstützten heizgerätes
AT509212B1 (de) * 2010-03-01 2011-07-15 Vaillant Group Austria Gmbh Vorrichtung und ein verfahren zur regelung des brenngas-luft-verhältnisses eines brenngasbetriebenen brenners
CN109000918B (zh) * 2018-09-21 2024-06-04 中国船舶集团有限公司第七一一研究所 气体发动机电控燃气喷射阀测试装置及其测试方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1156961A (fr) * 1955-07-30 1958-05-23 Siemens Ag Régulateur de rapport pour la distribution de la quantité d'air nécessaire pour la combustion d'une quantité déterminée de combustible
FR2260751B1 (fr) * 1974-02-08 1976-06-25 Peugeot & Renault
GB1571906A (en) * 1977-11-22 1980-07-23 British Gas Corp Air fuel gas ratio controls for burners
DE2925975A1 (de) * 1979-06-27 1981-01-15 Siemens Ag Mengendurchflussmesser
US4498863A (en) * 1981-04-13 1985-02-12 Hays-Republic Corporation Feed forward combustion control system
LU83989A1 (fr) * 1982-03-09 1983-11-17 Arbed Procede et dispositif pour optimiser le fonctionnement d'un four
US4478076A (en) * 1982-09-30 1984-10-23 Honeywell Inc. Flow sensor

Also Published As

Publication number Publication date
EP0341323A1 (fr) 1989-11-15
DE3870611D1 (de) 1992-06-04
EP0341323B1 (fr) 1992-04-29

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