EP0664422B1 - Compound pressure sensor - Google Patents

Compound pressure sensor Download PDF

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Publication number
EP0664422B1
EP0664422B1 EP95100657A EP95100657A EP0664422B1 EP 0664422 B1 EP0664422 B1 EP 0664422B1 EP 95100657 A EP95100657 A EP 95100657A EP 95100657 A EP95100657 A EP 95100657A EP 0664422 B1 EP0664422 B1 EP 0664422B1
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EP
European Patent Office
Prior art keywords
pressure
combustion
combustion air
ratio
regulation
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Expired - Lifetime
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EP95100657A
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German (de)
French (fr)
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EP0664422A1 (en
Inventor
Kunibert Dr. Neu
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Karl Dungs GmbH and Co KG
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Karl Dungs GmbH and Co KG
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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
    • F23N1/025—Regulating fuel supply conjointly with air supply using electrical or electromechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure

Definitions

  • the present invention relates to a device for permanently monitoring the relationship between the static fuel pressure p br and the static combustion air pressure p l shortly before the combination of fuel and combustion air in a combustion heat generator.
  • Pressure switches for gas and air pressures are known, for example the "Compact pressure switch for gases and air type GW A4" and the “Differential pressure switch for air type LGW A1" from DUNGS, which are to be set to a defined pressure value and when this is reached Set pressure forward an electrical signal by closing a contact. These pressure switches are not suitable for monitoring a control pressure range.
  • Pressure sensors that convert the pending media pressure into an analog electrical output signal can be used for the intended application, but must be connected to one another via logic.
  • the present invention relates to the mechanical implementation of a permanent pressure ratio monitoring in which the absolute pressure values are irrelevant. Deviations in the equilibrium of moments, caused by excessive air pressure or excessive gas pressure, should be able to be detected and generate electrical signals which may switch off the combustion heat generator.
  • Variable outputs are controlled via air volume metering, for example by operating a blower motor at different speeds or by connecting or closing an air damper to a blower when the blower motor is running at a constant speed.
  • the reference variable for all pneumatic compound controls is the combustion air pressure, which is set in the burner tube after the flap in accordance with the flap position. All compound controls, in which the pressures of the two mixture components air and gas are used as control variables, work on the same principle, regardless of how the two control membranes are spatially assigned to each other and whether they are in a fixed or changeable force-lever arm ratio or not .
  • Static pressures are used to regulate and control the combustion mixture, which are in a fixed, adjusted relationship to one another.
  • the mode of operation of the pneumatic compound control is based on the equilibrium between the two moments of the forces on the air membrane times the lever arm on the air side and the forces on the gas membrane times the lever arm on the gas side of the balance beam.
  • the object of the present invention is to present a monitoring device of the type described at the outset, with which not only a defined operating point of the combustion heat generator, but an entire operating range can be monitored, the same gas-to-air pressure settings which should also be comprehensible and which also have a compound control system .
  • the device described at the outset has two control membranes which are mechanically connected to one another and on one side of which the fuel pressure p br acts in the first control membrane, the combustion air pressure p l acts in the second control membrane, and with a switching mechanism which is acted upon by one of the two control membranes, preferably by the second, with the combustion air pressure p l , the switching mechanism emitting a signal to the outside depending on the switching state.
  • the device according to the invention thus has the great advantage that the ratio between the static fuel pressure p br and the static combustion air pressure p l can be permanently monitored, with no additional external auxiliary energy being required. Deviations from a permanently adjusted ratio can be communicated to a user or a corresponding control device via the switching mechanism. Furthermore, it is particularly advantageous that, in the device according to the invention, essential parts of the compound control devices known per se can be adopted directly.
  • a particularly preferred embodiment of the invention is characterized in that on the other side of the two control membranes, the combustion chamber pressure p f of the heat generator acts.
  • the ratio (p br - p f ) / (p l - p f ) is then monitored. For p f ⁇ p br , p l this monitoring ratio changes into the ratio p br / p l .
  • this room can be connected to the atmospheric pressure, so that in this embodiment it is alternatively possible to monitor the ratio p br / p l .
  • control membranes are preferably subjected to the combustion chamber pressure p f on their underside, while the burner pressure p br is applied to the top of the first control membrane and the combustion air pressure p l is applied to the top of the second control membrane.
  • this enables geometrically particularly simple pressure feeds.
  • the mechanical connection of the two control membranes comprises a lever mechanism with a fixed lever arm ratio.
  • the device can then be operated at a specific, predetermined gas / air pressure ratio.
  • the lever arm ratio of the lever mechanism can be changed. This allows a desired operating point to be set within certain limits.
  • lever mechanism comprises a balance beam resting on an in particular horizontally displaceable cutting edge bearing.
  • a spring device is provided on one of the two balance arms, preferably on the side of the first control membrane, for balancing the moments and for zero point adjustment of the moment balance on the balance beam.
  • a spring preferably the first control membrane, can be acted upon.
  • a particularly preferred embodiment of the invention is characterized in that an actuator of the switching mechanism is connected to a control membrane, preferably the second.
  • the actuator then follows the corresponding travel of the control diaphragm, so that the position of the actuator can be used to display the position of the control diaphragm in the switching mechanism.
  • the switching mechanism is preferably designed as an electrical switch.
  • the switching mechanism preferably has at least two switching states in order to be able to indicate a positive or negative deviation from a set pressure ratio. It is also possible to provide further switching states which permit a finer deviation scaling, as a result of which different displays or reactions are possible according to the deviation amount.
  • the invention is not only limited to a combustion heat generator, but can in principle be used wherever a certain set pressure ratio is to be monitored or regulated.
  • Fig. 1, 1 shows a device according to the invention for the permanent monitoring of mixture pressures, hereinafter referred to as compound pressure switch, which can be used in a combustion heat generator.
  • the gas fan burner 50 shown in FIG. 2 can be used as such a combustion heat generator, for example.
  • a radial fan 51 shown schematically in FIG. 2, draws in the ambient air and presses the compressed air through an air flap 52 through a flow channel 53 into a combustion chamber 54 of a boiler 55.
  • the constriction which determines the flow, forms a baffle plate 56 in the flow channel 53, which has a special design for intensive mixing of the air with the fuel gas.
  • a motor-operated air flap arranged on the suction or pressure side of the fan 51 adjusts the required amount of air.
  • the blower 51 has the sole task of providing the combustion air in sufficient quantity.
  • the instantaneous volume flow is represented in the flow channel 53 in front of the baffle plate 56 by a static pressure component, which is measured at the tap 58 as a representative measured variable for the air pressure p l .
  • the narrowest point for the gas flow is a gas nozzle 59, which can be composed of several individual bores.
  • the pressure gradient determining the volume flow is determined by the static pressure p br (tap 61) measured in the gas supply 60 in a smooth pipeline and the pressure p f forming in the combustion chamber 54. The pressure energy contained in both media is used to overcome flow losses and to form a mixture.
  • the gas-air composite fitting of the fan burner 50 is connected to the composite pressure switch 1 according to the invention shown in FIG. 1.
  • the static pressure of the combustion air p 1 is introduced into a first chamber 3 ′ of the composite pressure monitor 1 via an opening 3 formed in the housing 2 of the composite pressure monitor 1.
  • This air-side chamber 3 ' is closed at the bottom by a membrane plate 4, on which a control membrane 4' rests.
  • the pressure of the fuel gas p br is introduced into a second chamber 5 ′ of the composite pressure monitor 1 via a second opening 5 in the housing 2.
  • This gas-side chamber 5 ' is closed at the same height as the first membrane plate 4 by a second membrane plate 6, on which a control membrane 6' also rests.
  • the combustion chamber pressure p f prevailing in the combustion chamber 55 of the boiler is passed via a third opening 7 into the space 7 'under the two membrane plates 4, 6.
  • the two chambers 3 ', 7' and 5 ', 7' are each separated from each other by the two control membranes 4 ', 6' resting on the membrane plates 4, 6, whereas the two chambers 3 ', 5' are separated by a partition 2 ' are separated from each other.
  • the two membrane plates 4, 6 of the same area are arranged horizontally at the same height and are non-positively coupled to one another via a balance beam 8.
  • the two control diaphragms 4 ', 6' are so elastic, for example due to excess material, that they do not hinder the movements of the diaphragm plates 4, 6.
  • the balance beam 8 rests on a displaceable cutting edge bearing 9. Via a support adjustment mechanism 10, the lever arm ratio of the balance beam 8 can be adjusted from the outside via a slotted screw 10 '. If membrane plates 4, 6 do not have the same area, the lever arm ratio is shifted in accordance with the area ratio of both membrane plates 4, 6.
  • a spring device 11 and a counter bearing 16 are provided on the right arm of the balance beam 8 for balancing the moments on the balance beam 8 and for zero point adjustment of the moment balance.
  • the spring device 11 consists of a bolt 13, which is acted upon by a spring 12 in the direction of the right diaphragm plate 6 and has an enlarged central section 13a. This middle section 13a cooperates with a stop 14 fixed to the housing, as a result of which the movement of the bolt 13 in the direction of the diaphragm plate 6 is limited.
  • the tension of the spring 12 can be adjusted from the outside via an adjusting screw 15 sealed with respect to the chamber 7 '.
  • the counter bearing 16 to the spring device 11 is formed by a bolt 18 acted upon by a spring 17, which engages on the upper side of the right diaphragm plate 6.
  • the prestressing force of the spring 17 can be set in a defined manner from the outside by means of an adjusting screw 15a, which is sealed with respect to the chamber 5 '.
  • the travel of the pin 18 is limited by the fact that its enlarged middle section 18a cooperates with a stop 19 fixed to the housing.
  • the forces of the springs 15, 17 only become effective when the balance beam 8 is deflected, since the spring forces acting on the bolts 13, 18 are absorbed by the stops 14, 19 in the equilibrium position of the balance beam 8, that is to say internal forces are involved.
  • the two stops 14, 19 fixed to the housing also limit the possible deflections of the balance beam 8 downwards or upwards, the stop 14 interacting with the balance beam 8, the stop 19 interacting with the diaphragm plate 6.
  • a switching mechanism is coupled to the left diaphragm plate 4.
  • a switching pin 21 rests on the top of the diaphragm plate 4, the upper end and the central section of which each have a thickening 21a, b.
  • the switching pin 21 is subjected to a downward force via a spring 22.
  • Two electrical contact springs 23, 24 can be deflected via the two thickenings 23a, b.
  • the contact springs 23, 24 are acted upon upwards or downwards via the upward or downward arc springs 23a or 24a. In the horizontal position of the balance beam 8, the upper contact spring 23 therefore bears against an upper contact element 25, and the lower contact spring 24 bears against a lower contact element 26.
  • the lower contact spring 24 is deflected upward against the arc spring 24a via the thickening 21b of the switching bolt 21 and in turn comes into contact with the middle contact element 27.
  • the contact spring 23 now remains in contact with the upper contact element 25.
  • the contacts 25, 26, 27 are guided through the housing 2 to the outside, and the mutually conductively connected contact springs 23, 24 are also guided to the outside via a common line 22, so that the switching state of the switching mechanism 20 and thus the position of the balance beam 8 can be displayed outside the housing 2 via an electrical signal.
  • the fuel pressure p br acts on the upper side of the left diaphragm plate 4 and the combustion air pressure p l acts on the upper side of the right diaphragm plate 6.
  • the underside of both diaphragm plates 4, 6 is subjected to the combustion chamber pressure p f of the heat generator.
  • the ratio (p br - p f ) / (p l - p f ) is thereby monitored via the lever mechanism 8, 9 described above, and both positive and negative deviations from a set ratio can be indicated via the switching mechanism 20 outside the housing 2 or further processable. If, for example, the air pressure component p l predominates, the composite pressure monitor 1 is out of balance and the spring preload of the spring 17 is overcome, so that the switching mechanism 20 of the composite pressure monitor 1 switches.
  • the monitoring ratio for p f ⁇ p br , p l changes into the ratio p br / p l .
  • this chamber 7' can be connected to the atmospheric pressure, so that in this embodiment an alternative It is also possible to monitor the exact ratio p br / p l .
  • a device 1 for the permanent monitoring of the relationship between the static fuel pressure p br and the static combustion air pressure p l shortly before the combination of fuel and combustion air in a combustion heat generator 50 has two control diaphragms 4 ', 6', which are mechanically connected to one another and on one of them Side in the first control membrane 6 'the fuel pressure p br , in the second control membrane 4' the combustion air pressure p l acts, and a switching mechanism 20 which is acted upon by the second control membrane 4 'with the combustion air pressure p l , the switching mechanism 20 each emits a signal to the outside after switching status.
  • the monitoring of the pressure ratio therefore does not require any additional auxiliary energy, and deviations from a fixedly adjusted ratio can be recorded and further processed via the switching mechanism 20.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

The monitor monitors the relationship between the static combustion fuel pressure and the static combustion air pressure shortly before the bringing together of fuel and combustion air in a combustion heat producer. It has two regulating membranes (4', 6') which, via a lever mechanism with fixed or alterable lever arm ratio, are joined to one another. On one side of the first regulating membrane (6'), the fuel pressure acts and on the second regulating membrane (4'), the combustion air pressure works. On one arm of a weighing beam (8) a spring device (11) and a counter bearing (16) are so arranged that they counteract any possible disengagement of the weighing beam.

Description

Die vorliegende Erfindung betrifft eine Vorrichtung zur permanenten Überwachung des Verhältnisses zwischen dem statischen Brennstoffdruck pbr und dem statischen Verbrennungsluftdruck pl kurz vor der Zusammenführung von Brennstoff und Verbrennungsluft in einem Verbrennungswärmeerzeuger.The present invention relates to a device for permanently monitoring the relationship between the static fuel pressure p br and the static combustion air pressure p l shortly before the combination of fuel and combustion air in a combustion heat generator.

Bekannt sind Druckwächter für Gas- und Luftdrücke, beispielsweise der "Compact-Druckwächter für Gase und Luft Typ GW A4" und der "Differenz-Druckwächter für Luft Type LGW A1" der Firma DUNGS, die auf einen definierten Druckwert einzustellen sind und bei Erreichen dieses Einstelldruckes ein elektrisches Signal durch Schließen eines Kontaktes weiterleiten. Diese Druckwächter sind nicht zur Überwachung eines Regeldruckbereiches geeignet.Pressure switches for gas and air pressures are known, for example the "Compact pressure switch for gases and air type GW A4" and the "Differential pressure switch for air type LGW A1" from DUNGS, which are to be set to a defined pressure value and when this is reached Set pressure forward an electrical signal by closing a contact. These pressure switches are not suitable for monitoring a control pressure range.

Drucksensoren, die den anstehenden Mediendruck in ein analoges elektrisches Ausgangssignal umwandeln, sind für den vorgesehenen Einsatzfall anwendbar, müssen aber über eine Logik miteinander verbunden werden.Pressure sensors that convert the pending media pressure into an analog electrical output signal can be used for the intended application, but must be connected to one another via logic.

Diese Kombination eines Gasdrucksensors mit einem Luftdrucksensor ist nicht Gegenstand der vorliegenden Erfindung.This combination of a gas pressure sensor with an air pressure sensor is not the subject of the present invention.

Die vorliegende Erfindung betrifft vielmehr die mechanische Umsetzung einer permanenten Druckverhältnisüberwachung, bei der die absoluten Druckwerte ohne Belang sind. Abweichungen des Momentengleichgewichtes, hervorgerufen durch überhöhten Luftdruck oder überhöhten Gasdruck, sollen erfaßt werden können und elektrische Signale erzeugen, die ggf. den Verbrennungswärmeerzeuger abschalten.Rather, the present invention relates to the mechanical implementation of a permanent pressure ratio monitoring in which the absolute pressure values are irrelevant. Deviations in the equilibrium of moments, caused by excessive air pressure or excessive gas pressure, should be able to be detected and generate electrical signals which may switch off the combustion heat generator.

Im Gegensatz zur einstufigen Verbrennung, mit der ein Wärmebedarf durch Ein- und Ausschalten eines Gebläsebrenners angepaßt wird, geschieht dies bei gleitend oder modulierend arbeitenden Brennern nur recht selten, da der Wärmebedarf durch flexible Anpassung der Wärmeleistung des Brenners erfolgt. Hierbei ist es wichtig, daß bei jeder Brennerlaststellung die Anteile an Brennstoff und erforderlicher Luftmenge wiederholbar so geregelt werden, daß stets eine hygienische Verbrennung besteht.In contrast to single-stage combustion, with which a heat requirement is adjusted by switching a fan burner on and off, this only happens very rarely in the case of burners which work in a modulating or modulating manner, since the heat is required by flexibly adapting the heat output of the burner. It is important that the proportions of fuel and the required amount of air are repeatedly controlled in each burner load position so that always one hygienic combustion exists.

Veränderliche Leistungen werden über Luftmengenzumessung gesteuert, indem beispielsweise ein Gebläsemotor mit unterschiedlichen Drehzahlen betrieben wird oder einem Gebläse eine Luftklappe vor- oder nachgeschaltet wird, wenn der Gebläsemotor mit konstanter Drehzahl läuft.Variable outputs are controlled via air volume metering, for example by operating a blower motor at different speeds or by connecting or closing an air damper to a blower when the blower motor is running at a constant speed.

Die Führungsgröße ist bei allen pneumatischen Verbundregelungen der Verbrennungsluftdruck, der sich im Brennerrohr nach der Klappe entsprechend der Klappenstellung einstellt. Alle Verbundregelungen, bei denen die Drücke der beiden Gemischbestandteile Luft und Gas als Regelgrößen verwendet werden, arbeiten nach demselben Prinzip, unabhängig davon, wie die beiden Steuermembranen räumlich einander zugeordnet sind und ob sie in einem festen oder veränderbaren Kraftmal-Hebelarm-Verhältnis stehen oder nicht.The reference variable for all pneumatic compound controls is the combustion air pressure, which is set in the burner tube after the flap in accordance with the flap position. All compound controls, in which the pressures of the two mixture components air and gas are used as control variables, work on the same principle, regardless of how the two control membranes are spatially assigned to each other and whether they are in a fixed or changeable force-lever arm ratio or not .

Gemeinsam ist allen pneumatischen Verbundregelungen auch die Möglichkeit der Berücksichtigung der Drücke im Feuerraum des z.B. Kessels, so daß die für den Massenstrom vom Brenner in den Feuerraum ausschlaggebende Druckdifferenz mit bei der Gemischzusammensetzung berücksichtigt werden kann.Common to all pneumatic compound controls is the possibility of considering the pressures in the combustion chamber of e.g. Boiler so that the pressure difference that is decisive for the mass flow from the burner into the combustion chamber can also be taken into account in the mixture composition.

Für die Regelung und Steuerung des Verbrennungsgemisches werden statische Drücke verwendet, die in einem festen einjustierten Verhältnis zueinander stehen. Die Wirkungsweise der pneumatischen Verbundregelung, wie sie beispielsweise aus DE 25 47 075 C3 bekannt ist, basiert auf der Gleichgewichtsbildung zwischen den beiden Momenten der Kräfte an der Luftmembran mal Hebelarm Luftseite und der Kräfte an der Gasmembran mal Hebelarm der Gasseite des Waagebalkens.Static pressures are used to regulate and control the combustion mixture, which are in a fixed, adjusted relationship to one another. The mode of operation of the pneumatic compound control, as is known for example from DE 25 47 075 C3, is based on the equilibrium between the two moments of the forces on the air membrane times the lever arm on the air side and the forces on the gas membrane times the lever arm on the gas side of the balance beam.

Aufgabe der vorliegenden Erfindung ist es, eine Überwachungseinrichtung der eingangs geschilderten Art vorzustellen, mit der nicht nur ein definierter Betriebspunkt des Verbrennungswärmeerzeugers, sondern ein ganzer Betriebsbereich überwacht werden kann, wobei die gleichen Gas-zu-Luftdruckeinstellungen nachvollziehbar sein sollen, die auch eine Verbundregelung aufweist.The object of the present invention is to present a monitoring device of the type described at the outset, with which not only a defined operating point of the combustion heat generator, but an entire operating range can be monitored, the same gas-to-air pressure settings which should also be comprehensible and which also have a compound control system .

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die eingangs beschriebene Vorrichtung mit zwei Regelmembranen, die mechanisch miteinander verbunden sind und auf deren einen Seite bei der ersten Regelmembran der Brennstoffdruck pbr, bei der zweiten Regelmembran der Verbrennungsluftdruck pl wirkt, und mit einem Schaltwerk ausgebildet ist, das von einer der beiden Regelmembranen, vorzugsweise von der zweiten, mit dem Verbrennungsluftdruck pl beaufschlagt wird, wobei das Schaltwerk je nach Schaltzustand ein Signal nach außen abgibt.This object is achieved in that the device described at the outset has two control membranes which are mechanically connected to one another and on one side of which the fuel pressure p br acts in the first control membrane, the combustion air pressure p l acts in the second control membrane, and with a switching mechanism which is acted upon by one of the two control membranes, preferably by the second, with the combustion air pressure p l , the switching mechanism emitting a signal to the outside depending on the switching state.

Die erfindungsgemäße Vorrichtung hat damit den großen Vorteil, daß das Verhältnis zwischen dem statischen Brennstoffdruck pbr und dem statischen Verbrennungsluftdruck pl permanent überwacht werden kann, wobei keine zusätzliche Hilfsenergie von außen erforderlich ist. Dabei können Abweichungen von einem fest einjustierten Verhältnis einem Benutzer oder einer entsprechenden Kontrollvorrichtung über das Schaltwerk mitgeteilt werden. Weiterhin ist besonders vorteilhaft, daß bei der erfindungsgenmäßen Vorrichtung wesentliche Teile der an sich bekannten Verbundregelungseinrichtungen direkt übernommen werden können.The device according to the invention thus has the great advantage that the ratio between the static fuel pressure p br and the static combustion air pressure p l can be permanently monitored, with no additional external auxiliary energy being required. Deviations from a permanently adjusted ratio can be communicated to a user or a corresponding control device via the switching mechanism. Furthermore, it is particularly advantageous that, in the device according to the invention, essential parts of the compound control devices known per se can be adopted directly.

Eine besonders bevorzugte Ausführungsform der Erfindung kennzeichnet sich dadurch, daß jeweils auf der anderen Seite der beiden Regelmembranen der Feuerraumdruck pf des Wärmeerzeugers wirkt. Dies erlaubt es, den Druck pf im Feuerraum, beispielsweise eines Kessels, bei der permanenten Überwachung miteinzubeziehen, so daß die für den Massenstrom vom Brenner in den Feuerraum ausschlaggebende Druckdifferenz bei der Gemischzusammensetzung ebenfalls berücksichtigt werden kann. Bei dieser Ausführungsform wird dann das Verhältnis (pbr - pf)/(pl - pf) überwacht. Dieses Überwachungsverhältnis geht für pf << pbr, pl in das Verhältnis pbr/pl über. Anstatt den Raum auf der anderen Seite der beiden Regelmembranen mit dem Feuerraumdruck pf zu beaufschlagen, kann dieser Raum mit dem Atmosphärendruck verbunden werden, so daß bei dieser Ausführungsform alternativ auch eine Überwachung des Verhältnises pbr/pl möglich ist.A particularly preferred embodiment of the invention is characterized in that on the other side of the two control membranes, the combustion chamber pressure p f of the heat generator acts. This allows the pressure p f in the combustion chamber, for example of a boiler, to be included in the permanent monitoring, so that the pressure difference in the mixture composition, which is decisive for the mass flow from the burner into the combustion chamber, can also be taken into account. In this embodiment, the ratio (p br - p f ) / (p l - p f ) is then monitored. For p f << p br , p l this monitoring ratio changes into the ratio p br / p l . Instead of applying the combustion chamber pressure p f to the room on the other side of the two control membranes, this room can be connected to the atmospheric pressure, so that in this embodiment it is alternatively possible to monitor the ratio p br / p l .

Bevorzugt sind die Regelmembranen an ihrer Unterseite mit dem Feuerraumdruck pf beaufschlagt, während an der Oberseite der ersten Regelmembran der Brennerdruck pbr und an der Oberseite der zweiten Regelmembran der Verbrennungsluftdruck pl anliegt. Dies ermöglicht unter anderem geometrisch besonders einfache Druckzuführungen.The control membranes are preferably subjected to the combustion chamber pressure p f on their underside, while the burner pressure p br is applied to the top of the first control membrane and the combustion air pressure p l is applied to the top of the second control membrane. Among other things, this enables geometrically particularly simple pressure feeds.

Bei einer sehr einfachen Ausführungsform der erfindungsgemäßen Vorrichtung umfaßt die mechanische Verbindung der beiden Regelmembranen eine Hebelmechanik mit festem Hebelarmverhältnis. Die Vorrichtung kann dann bei einem bestimmten, vorgegebenen Gas-/Luftdruckverhältnis betrieben werden.In a very simple embodiment of the device according to the invention, the mechanical connection of the two control membranes comprises a lever mechanism with a fixed lever arm ratio. The device can then be operated at a specific, predetermined gas / air pressure ratio.

Bei einer etwas komfortableren Ausführungsform ist das Hebelarmverhältnis der Hebelmechanik veränderbar. Damit läßt sich in gewissen Grenzen ein jeweils gewünschter Betriebspunkt einstellen.In a somewhat more comfortable embodiment, the lever arm ratio of the lever mechanism can be changed. This allows a desired operating point to be set within certain limits.

Bevorzugt ist eine Weiterbildung dieser Ausführungsform, bei der die Hebelmechanik einen auf einem insbesondere horizontal verschiebbaren Schneidenlager aufliegenden Waagebalken umfaßt. Eine solche Waagenkonstruktion ist besonders empfindlich und technisch relativ einfach herstellbar.A further development of this embodiment is preferred, in which the lever mechanism comprises a balance beam resting on an in particular horizontally displaceable cutting edge bearing. Such a scale construction is particularly sensitive and technically relatively easy to manufacture.

Bevorzugt ist eine Weiterbildung, bei der an einem der beiden Waagearme, vorzugsweise auf der Seite der ersten Regelmembran, eine Federvorrichtung zum Austarieren der Momente und zur Nullpunktverstellung des Momentengleichgewichts am Waagebalken vorgesehen ist. Insbesondere kann eine, vorzugsweise die erste Regelmembran mit einer Feder beaufschlagt werden. Eine solche Anordnung gestattet eine Kennlinien-Parallelverschiebung bei dem im Brenner angebotenen Gemisch in Richtung auf einen Gas- oder Luftüberschuß.A further development is preferred in which a spring device is provided on one of the two balance arms, preferably on the side of the first control membrane, for balancing the moments and for zero point adjustment of the moment balance on the balance beam. In particular, a spring, preferably the first control membrane, can be acted upon. Such an arrangement allows a characteristic parallel shift in the mixture offered in the burner in the direction of a gas or air excess.

Eine besonders bevorzugte Ausführungsform der Erfindung kennzeichnet sich dadurch, daß ein Stellglied des Schaltwerks mit einer Regelmembran, vorzugsweise der zweiten, verbunden ist. Das Stellglied vollzieht dann der Bewegung der Regelmembran entsprechende Stellwege nach, so daß die Position des Stellgliedes zur Anzeige der Stellung der Regelmembran im Schaltwerk genutzt werden kann. Das Schaltwerk ist bevorzugt als ein elektrischer Schalter ausgebildet.A particularly preferred embodiment of the invention is characterized in that an actuator of the switching mechanism is connected to a control membrane, preferably the second. The actuator then follows the corresponding travel of the control diaphragm, so that the position of the actuator can be used to display the position of the control diaphragm in the switching mechanism. The switching mechanism is preferably designed as an electrical switch.

Vorzugsweise weist das Schaltwerk mindestens zwei Schaltzustände auf, um jeweils ein positives oder negatives Abweichen von einem eingestellten Druckverhältnis anzeigen zu können. Es können noch weitere Schaltzustände vorgesehen werden, die eine feinere Abweichungsskalierung erlauben, wodurch entsprechend dem Abweichungsbetrag unterschiedliche Anzeigen bzw. Reaktionen möglich sind.The switching mechanism preferably has at least two switching states in order to be able to indicate a positive or negative deviation from a set pressure ratio. It is also possible to provide further switching states which permit a finer deviation scaling, as a result of which different displays or reactions are possible according to the deviation amount.

Die Erfindung ist nicht nur auf einen Verbrennungswärmeerzeuger beschränkt, sondern kann prinzipiell überall dort eingesetzt werden, wo ein bestimmtes eingestelltes Druckverhältnis überwacht bzw. geregelt werden soll.The invention is not only limited to a combustion heat generator, but can in principle be used wherever a certain set pressure ratio is to be monitored or regulated.

Weitere Vorteile ergeben sich aus der Beschreibung und der beigefügten Zeichnung. Ebenso können die vorstehend genannten und die noch weiter aufgeführten Merkmale erfindungsgemäß jeweils einzeln für sich oder in beliebigen Kombinationen miteinander verwendet werden. Die erwähnte Ausführungsform ist nicht als abschließendes Beispiel zu verstehen, sondern hat vielmehr beispielhaften Charakter.Further advantages result from the description and the attached drawing. Likewise, the features mentioned above and those listed further can be used individually according to the invention or in any combination with one another. The embodiment mentioned is not to be understood as a final example, but rather has an exemplary character.

Die Erfindung ist in der Zeichnung dargestellt und wird anhand eines Ausführungsbeispieles näher erläutert. Es zeigen:

Fig. 1
einen Schnitt durch die erfindungsgemäße Vorrichtung zur permanenten Überwachung des Brennstoff-Verbrennungsluft-Druckverhältnisses; und
Fig. 2
eine schematische Darstellung eines Gasgebläsebrenners mit druckseitiger Luftklappe.
The invention is illustrated in the drawing and is explained in more detail using an exemplary embodiment. Show it:
Fig. 1
a section through the inventive device for permanent monitoring of the fuel-combustion air pressure ratio; and
Fig. 2
a schematic representation of a gas fan burner with pressure-side air flap.

In Fig. 1 ist mit 1 eine erfindungsgemäße Vorrichtung zur permantenen Überwachung von Gemischdrücken, im folgenden als Verbunddruckwächter bezeichnet, gezeigt, der in einem Verbrennungswärmeerzeuger eingesetzt werden kann.In Fig. 1, 1 shows a device according to the invention for the permanent monitoring of mixture pressures, hereinafter referred to as compound pressure switch, which can be used in a combustion heat generator.

Als ein solcher Verbrennungswärmeerzeuger kann beispielsweise der in Fig. 2 gezeigte Gasgebläsebrenner 50 verwendet werden. Bei diesem Gasgebläsebrenner 50 saugt ein in Fig. 2 schematisch dargestelltes Radialgebläse 51 die Umgebungsluft an und drückt die verdichtete Luft über eine Luftklappe 52 durch einen Strömungskanal 53 in einen Feuerraum 54 eines Kessels 55. Die durchflußbestimmende Engstelle bildet im Strömungskanal 53 eine Stauscheibe 56 aus, die durch eine besondere Gestaltung für eine intensive Durchmischung der Luft mit dem Brenngas sorgt. Bei nicht drehzahlgeregelten Gebläsen stellt eine motorbetriebene, auf der Ansaug- oder Druckseite des Gebläses 51 angeordnete Luftklappe die erforderliche Luftmenge ein.The gas fan burner 50 shown in FIG. 2 can be used as such a combustion heat generator, for example. In this gas fan burner 50, a radial fan 51, shown schematically in FIG. 2, draws in the ambient air and presses the compressed air through an air flap 52 through a flow channel 53 into a combustion chamber 54 of a boiler 55. The constriction, which determines the flow, forms a baffle plate 56 in the flow channel 53, which has a special design for intensive mixing of the air with the fuel gas. In the case of fans which are not speed-controlled, a motor-operated air flap arranged on the suction or pressure side of the fan 51 adjusts the required amount of air.

Das Gebläse 51 hat ausschließlich die Aufgabe, die Verbrennungsluft in ausreichender Menge bereitzustellen. Der momentane Volumenstrom bildet sich im Strömungskanal 53 vor der Stauscheibe 56 durch einen statischen Druckanteil ab, der am Abgriff 58 als repräsentative Meßgröße für den Luftdruck pl gemessen wird.The blower 51 has the sole task of providing the combustion air in sufficient quantity. The instantaneous volume flow is represented in the flow channel 53 in front of the baffle plate 56 by a static pressure component, which is measured at the tap 58 as a representative measured variable for the air pressure p l .

Die engste Stelle für den Gasstrom bildet nach Fig. 2 eine Gasdüse 59, die sich aus mehreren Einzelbohrungen zusammensetzen kann. Das volumenstrombestimmende Druckgefälle wird durch den in der Gaszufuhr 60 gemessenen statischen Druck pbr (Abgriff 61) in einer glatten Rohrleitung und dem im Feuerraum 54 sich bildenden Druck pf bestimmt. Die in beiden Medien enthaltene Druckenergie wird zur Überwindung von Strömungsverlusten sowie zur Gemischbildung eingesetzt.According to FIG. 2, the narrowest point for the gas flow is a gas nozzle 59, which can be composed of several individual bores. The pressure gradient determining the volume flow is determined by the static pressure p br (tap 61) measured in the gas supply 60 in a smooth pipeline and the pressure p f forming in the combustion chamber 54. The pressure energy contained in both media is used to overcome flow losses and to form a mixture.

Beim Einstellen des Gasgebläsebrenners 50 mit der beschriebenen Gas-Luft-Verbundarmatur kann bei der Einregulierung der Maximalleistung nicht festgestellt werden, ob sich beim weiteren Öffnen der Luftklappe 52 und damit bei ansteigendem Luftdruck pl auch der Gasdruck pbr nach der Armatur im gewählten Verhältnis mitgeändert hat. Das heißt, es kann passieren, daß die Gasarmatur bereits bei einem Winkel der Luftklappe 52 von beispielsweise 70° voll geöffnet war, so daß eine weitere Erhöhung des Luftklappenwinkels zwar die Luft-,nicht aber die Gasmenge erhöht.When adjusting the gas blower burner 50 with the gas-air composite fitting described, it cannot be determined when adjusting the maximum output whether the gas pressure p br after the fitting also changes in the selected ratio when the air flap 52 is opened further and thus with increasing air pressure p l Has. This means that it can happen that the gas fitting was already fully open at an angle of the air flap 52 of, for example, 70 °, so that a further increase in the air flap angle increases the amount of air but not the amount of gas.

Um dies zu verhindern, ist die Gas-Luft-Verbundarmatur des Gebläsebrenners 50 mit dem in Fig. 1 gezeigten erfindungsgemäßen Verbunddruckwächter 1 verbunden.In order to prevent this, the gas-air composite fitting of the fan burner 50 is connected to the composite pressure switch 1 according to the invention shown in FIG. 1.

Über eine im Gehäuse 2 des Verbunddruckwächters 1 ausgebildete Öffnung 3 wird der statische Druck der Verbrennungsluft p1 in eine erste Kammer 3' des Verbunddruckwächters 1 eingeleitet. Diese luftseitige Kammer 3' wird nach unten durch einen Membranteller 4 abgeschlossen, auf dem eine Regelmembran 4' aufliegt. Über eine zweite Öffnung 5 im Gehäuse 2 wird der Druck des Brenngases pbr in eine zweite Kammer 5' des Verbunddruckwächters 1 eingeleitet. Diese gasseitige Kammer 5' wird nach unten in gleicher Höhe wie der erste Membranteller 4 durch einen zweiten Membranteller 6 abgeschlossen, auf dem ebenfalls eine Regelmembran 6' aufliegt. Der in der Brennkammer 55 des Kessels herrschende Feuerraumdruck pf wird über eine dritte Öffnung 7 in den Raum 7' unter den beiden Membrantellern 4, 6 geführt. Durch die beiden auf den Membrantellern 4, 6 aufliegenden Regelmembrane 4', 6' sind die beiden Kammern 3', 7' bzw. 5', 7' jeweils voneinander getrennt, wohingegen die beiden Kammern 3', 5' durch eine Trennwand 2' voneinander getrennt sind.The static pressure of the combustion air p 1 is introduced into a first chamber 3 ′ of the composite pressure monitor 1 via an opening 3 formed in the housing 2 of the composite pressure monitor 1. This air-side chamber 3 'is closed at the bottom by a membrane plate 4, on which a control membrane 4' rests. The pressure of the fuel gas p br is introduced into a second chamber 5 ′ of the composite pressure monitor 1 via a second opening 5 in the housing 2. This gas-side chamber 5 'is closed at the same height as the first membrane plate 4 by a second membrane plate 6, on which a control membrane 6' also rests. The combustion chamber pressure p f prevailing in the combustion chamber 55 of the boiler is passed via a third opening 7 into the space 7 'under the two membrane plates 4, 6. The two chambers 3 ', 7' and 5 ', 7' are each separated from each other by the two control membranes 4 ', 6' resting on the membrane plates 4, 6, whereas the two chambers 3 ', 5' are separated by a partition 2 ' are separated from each other.

Die beiden flächengleichen Membranteller 4, 6 sind waagerecht auf gleicher Höhe angeordnet und über einen Waagebalken 8 kraftschlüßig miteinander gekoppelt. Die beiden Regelmembrane 4', 6' sind dabei, beispielsweise durch Materialüberschuß, so elastisch, daß sie die Bewegungen der Membranteller 4, 6 nicht behindern. Der Waagebalken 8 liegt auf einem verschiebbaren Schneidenlager 9 auf. Über einen Auflagerverstellmechanismus 10 kann das Hebelarmverhältnis des Waagebalkens 8 von außen über eine Schlitzschraube 10' eingestellt werden. Bei nicht flächengleichen Membrantellern 4, 6 ist das Hebelarmverhältnis entsprechend dem Flächenverhältnis beider Membranteller 4, 6 verschoben.The two membrane plates 4, 6 of the same area are arranged horizontally at the same height and are non-positively coupled to one another via a balance beam 8. The two control diaphragms 4 ', 6' are so elastic, for example due to excess material, that they do not hinder the movements of the diaphragm plates 4, 6. The balance beam 8 rests on a displaceable cutting edge bearing 9. Via a support adjustment mechanism 10, the lever arm ratio of the balance beam 8 can be adjusted from the outside via a slotted screw 10 '. If membrane plates 4, 6 do not have the same area, the lever arm ratio is shifted in accordance with the area ratio of both membrane plates 4, 6.

Zum Austarieren der Momente am Waagebalken 8 und zur Nullpunktverstellung des Momentengleichgewichts ist eine Federvorrichtung 11 und eine Gegenlager 16 an dem rechten Arm des Waagebalkens 8 vorgesehen. Die Federvorrichtung 11 besteht aus einem von einer Feder 12 in Richtung auf den rechten Membranteller 6 beaufschlagten Bolzen 13, der einen erweiterten Mittelabschnitt 13a aufweist. Dieser Mittelabschnitt 13a wirkt mit einem gehäusefesten Anschlag 14 zusammen, wodurch die Bewegung des Bolzens 13 in Richtung auf den Membranteller 6 begrenzt ist. Über eine gegenüber der Kammer 7' abgedichtete Stellschraube 15 kann die Spannung der Feder 12 von außen eingestellt werden. Das Gegenlager 16 zu der Federvorrichtung 11 wird durch einen von einer Feder 17 beaufschlagten Bolzen 18 gebildet, der auf der Oberseite des rechten Membrantellers 6 angreift. Durch eine Stellschraube 15a, die gegenüber der Kammer 5' abgedichtet ist, kann die Vorspannkraft der Feder 17 definiert von außen eingestellt werden. Der Stellweg des Bolzens 18 dadurch begrenzt, daß sein erweiterter Mittelabschnitt 18a mit einem gehäusefesten Anschlag 19 zusammenwirkt. Die Kräfte der Federn 15, 17 werden erst bei einer Auslenkung des Waagebalkens 8 wirksam, da die auf die Bolzen 13, 18 wirkenden Federkräfte in der Gleichgewichtsstellung des Waagelbalkens 8 von den Anschlägen 14, 19 aufgenommen werden, es sich also um innere Kräfte handelt.A spring device 11 and a counter bearing 16 are provided on the right arm of the balance beam 8 for balancing the moments on the balance beam 8 and for zero point adjustment of the moment balance. The spring device 11 consists of a bolt 13, which is acted upon by a spring 12 in the direction of the right diaphragm plate 6 and has an enlarged central section 13a. This middle section 13a cooperates with a stop 14 fixed to the housing, as a result of which the movement of the bolt 13 in the direction of the diaphragm plate 6 is limited. The tension of the spring 12 can be adjusted from the outside via an adjusting screw 15 sealed with respect to the chamber 7 '. The counter bearing 16 to the spring device 11 is formed by a bolt 18 acted upon by a spring 17, which engages on the upper side of the right diaphragm plate 6. The prestressing force of the spring 17 can be set in a defined manner from the outside by means of an adjusting screw 15a, which is sealed with respect to the chamber 5 '. The travel of the pin 18 is limited by the fact that its enlarged middle section 18a cooperates with a stop 19 fixed to the housing. The forces of the springs 15, 17 only become effective when the balance beam 8 is deflected, since the spring forces acting on the bolts 13, 18 are absorbed by the stops 14, 19 in the equilibrium position of the balance beam 8, that is to say internal forces are involved.

Die beiden gehäusefesten Anschläge 14, 19 beschränken außerdem die mögliche Auslenkungen des Waagebalkens 8 nach unten bzw. nach oben, wobei der Anschlag 14 mit dem Waagebalken 8, der Anschlag 19 mit dem Membranteller 6 zusammenwirkt.The two stops 14, 19 fixed to the housing also limit the possible deflections of the balance beam 8 downwards or upwards, the stop 14 interacting with the balance beam 8, the stop 19 interacting with the diaphragm plate 6.

Mit dem linken Membranteller 4 ist ein Schaltwerk gekoppelt. Dazu liegt auf der Oberseite des Membrantellers 4 ein Schaltbolzen 21 auf, dessen oberes Ende und dessen Mittelabschnitt jeweils eine Verdickung 21a,b aufweisen. Der Schaltbolzen 21 ist über eine Feder 22 mit einer Kraft nach unten beaufschlagt. Über die beiden Verdickungen 23a,b können zwei elektische Kontaktfedern 23, 24 ausgelenkt werden. Über die nach oben bzw. nach unten weisenden Bogenfedern 23a bzw. 24a sind die Kontaktfedern 23, 24 nach oben bzw. nach unten beaufschlagt. In der waagerechten Stellung des Waagebalkens 8 liegt daher die obere Kontaktfeder 23 an einem oberen Kontaktelement 25, die untere Kontaktfeder 24 an einem unteren Kontaktelement 26 an.A switching mechanism is coupled to the left diaphragm plate 4. For this purpose, a switching pin 21 rests on the top of the diaphragm plate 4, the upper end and the central section of which each have a thickening 21a, b. The switching pin 21 is subjected to a downward force via a spring 22. Two electrical contact springs 23, 24 can be deflected via the two thickenings 23a, b. The contact springs 23, 24 are acted upon upwards or downwards via the upward or downward arc springs 23a or 24a. In the horizontal position of the balance beam 8, the upper contact spring 23 therefore bears against an upper contact element 25, and the lower contact spring 24 bears against a lower contact element 26.

Bei Kräftegleichgewicht am Waagebalken 8 wird es keine Auslenkung geben, die einen der beiden Federkontakte 23, 24 zum Umschalten bringt. Erst eine Veränderung des Gleichgewichts wird eine Auslenkung des Waagebalkens 8 erzeugen, die ausreicht, einen Schaltvorgang einer Kontaktfeder 23, 24 auszulösen. Wird der linke Membranteller 4 nach unten ausgelenkt, so wird über die obere Verdickung 21a des Schaltbolzens 21 die obere Kontaktfeder 23 entgegen der Bogenfeder 23a nach unten ausgelenkt und kommt mit einem mittleren Kontaktelement 27 in Kontakt. Die Kontaktfeder 24 ist dabei weiterhin in Kontakt mit dem unteren Kontaktelement 26. Wird dagegen der linke Membranteller 4 nach oben ausgelenkt, so wird über die Verdickung 21b des Schaltbolzens 21 die untere Kontaktfeder 24 entgegen der Bogenfeder 24a nach oben ausgelenkt und kommt ihrerseits mit dem mittleren Kontaktelement 27 in Kontakt. Nunmehr bleibt die Kontaktfeder 23 weiterhin in Kontakt mit dem oberen Kontaktelement 25.If the balance beam 8 is balanced, there will be no deflection which causes one of the two spring contacts 23, 24 to switch over. Only a change in the equilibrium will produce a deflection of the balance beam 8, which is sufficient to trigger a switching process of a contact spring 23, 24. If the left diaphragm plate 4 is deflected downward, the upper contact spring 23 is deflected downward against the arc spring 23a via the upper thickening 21a of the switching bolt 21 and comes into contact with a central contact element 27. The contact spring 24 is still in contact with the lower contact element 26. If, on the other hand, the left diaphragm plate 4 is deflected upward, the lower contact spring 24 is deflected upward against the arc spring 24a via the thickening 21b of the switching bolt 21 and in turn comes into contact with the middle contact element 27. The contact spring 23 now remains in contact with the upper contact element 25.

Die Kontakte 25, 26, 27 sind durch das Gehäuse 2 nach außen geführt, und die miteinander leitend verbundenen Kontaktfedern 23, 24 über eine gemeinsame Leitung 22 ebenfalls nach außen geführt sind, so daß der Schaltzustand des Schaltwerkes 20 und somit die Stellung des Waagebalkens 8 außerhalb des Gehäuses 2 über ein elektrisches Signal angezeigt werden kann.The contacts 25, 26, 27 are guided through the housing 2 to the outside, and the mutually conductively connected contact springs 23, 24 are also guided to the outside via a common line 22, so that the switching state of the switching mechanism 20 and thus the position of the balance beam 8 can be displayed outside the housing 2 via an electrical signal.

Bei der in Fig. 1 gezeigten Ausführungsform der Erfindung wirkt jeweils auf der Oberseite des linken Membrantellers 4 der Brennstoffdruck pbr, auf der Oberseite des rechten Membrantellers 6 der Verbrennungsluftdruck pl. Die Unterseite beider Membranteller 4, 6 ist mit dem Feuerraumdruck pf des Wärmeerzeugers beaufschlagt. Über den oben beschriebenen Hebelmechanismus 8, 9 wird dadurch das Verhältnis (pbr - pf)/(pl - pf) überwacht, und sowohl positive als auch negative Abweichungen von einem eingestellten Verhältnis sind über das Schaltwerk 20 außerhalb des Gehäuses 2 anzeigbar bzw. weiterverarbeitbar. Überwiegt beispielsweise der Luftdruckanteil pl, so kommt der Verbunddruckwächter 1 aus der Balance, und die Feder-Vorspannung der Feder 17 wird überwunden, so daß das Schaltwerk 20 des Verbunddruckwächters 1 schaltet.In the embodiment of the invention shown in FIG. 1, the fuel pressure p br acts on the upper side of the left diaphragm plate 4 and the combustion air pressure p l acts on the upper side of the right diaphragm plate 6. The underside of both diaphragm plates 4, 6 is subjected to the combustion chamber pressure p f of the heat generator. The ratio (p br - p f ) / (p l - p f ) is thereby monitored via the lever mechanism 8, 9 described above, and both positive and negative deviations from a set ratio can be indicated via the switching mechanism 20 outside the housing 2 or further processable. If, for example, the air pressure component p l predominates, the composite pressure monitor 1 is out of balance and the spring preload of the spring 17 is overcome, so that the switching mechanism 20 of the composite pressure monitor 1 switches.

Das Überwachungsverhältnis geht für pf << pbr, pl in das Verhältnis pbr/pl über. Anstatt die Kammer 7' auf der Unterseite der beiden Membranen 4, 6 mit dem Feuerraumdruck pf zu beaufschlagen, kann diese Kammer 7' mit dem Atmosphärendruck verbunden werden, so daß bei dieser Ausführungsform alternativ auch eine Überwachung des exakten Verhältnises pbr/pl möglich ist.The monitoring ratio for p f << p br , p l changes into the ratio p br / p l . Instead of applying the combustion chamber pressure p f to the chamber 7 'on the underside of the two membranes 4, 6, this chamber 7' can be connected to the atmospheric pressure, so that in this embodiment an alternative It is also possible to monitor the exact ratio p br / p l .

Eine Vorrichtung 1 zur permanenten Überwachung des Verhältnisses zwischen dem statischen Brennstoffdruck pbr und dem statischen Verbrennungsluftdruck pl kurz vor der Zusammenführung von Brennstoff und Verbrennungsluft in einem Verbrennungswärmeerzeuger 50 weist zwei Regelmembrane 4', 6', die mechanisch miteinander verbunden sind und auf deren einen Seite bei der ersten Regelmembran 6' der Brennstoffdruck pbr, bei der zweiten Regelmembran 4' der Verbrennungsluftdruck pl wirkt, und ein Schaltwerk 20 auf, das von der zweiten Regelmembran 4' mit dem Verbrennungsluftdruck pl beaufschlagt wird, wobei das Schaltwerk 20 je nach Schaltzustand ein Signal nach außen abgibt. Die Überwachung des Druckverhältnisses erfordert somit keine zusätzliche Hilfsenergie, und Abweichungen von einem fest einjustierten Verhältnis können über das Schaltwerk 20 erfaßt und weiterverarbeitet werden.A device 1 for the permanent monitoring of the relationship between the static fuel pressure p br and the static combustion air pressure p l shortly before the combination of fuel and combustion air in a combustion heat generator 50 has two control diaphragms 4 ', 6', which are mechanically connected to one another and on one of them Side in the first control membrane 6 'the fuel pressure p br , in the second control membrane 4' the combustion air pressure p l acts, and a switching mechanism 20 which is acted upon by the second control membrane 4 'with the combustion air pressure p l , the switching mechanism 20 each emits a signal to the outside after switching status. The monitoring of the pressure ratio therefore does not require any additional auxiliary energy, and deviations from a fixedly adjusted ratio can be recorded and further processed via the switching mechanism 20.

Claims (6)

  1. Device (1) for continuous monitoring of the ratio between the static fuel pressure pbr and the static combustion air pressure p1 immediately prior to the mixing of fuel and combustion air in a combustion heat unit (50), having two regulation diaphragms (4', 6') which are connected to each other by means of a lever mechanism having fixed or variable lever arm ratio and including a balance arm (8) seated on a knife-edge bearing (9) with the fuel pressure pbr acting on one side at the first regulation diaphragm (6') and the combustion air pressure p1 acting on the second regulation diaphragm (4'), wherein a spring means (11) and a thrust bearing (16) are arranged at one arm of the balance arm (8) in such a fashion that they oppose possible deflections of the balance arm (8), and having a switching mechanism (20) subjected to the combustion air pressure p1 by means of one of the two regulation diaphragms (4', 6'), preferentially the second (4'), wherein the switching mechanism (20) issues an external signal in dependence on the switching state.
  2. Device according to claim 1, characterized in that, in each case, the furnace pressure pf of the combustion heat unit (50) acts on the other side of the two regulation diaphragms (4', 6').
  3. Device according to claim 2, characterized in that the regulation diaphragms (4', 6') are each subjected to the furnace pressure pf at their lower sides.
  4. Device according to one of the preceding claims, characterized in that the knife-edge bearing (9) is displaceable in a horizontal manner.
  5. Device according to one of the preceding claims, characterized in that an actuator (21) of the switching mechanism (20) is connected to a regulation diaphragm, preferentially to the second (4').
  6. Device according to claim 5, characterized in that the switching mechanism (20) is configured as an electrical switch (23, 24, 25, 26, 27, 28).
EP95100657A 1994-01-25 1995-01-19 Compound pressure sensor Expired - Lifetime EP0664422B1 (en)

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DE4402036A DE4402036C2 (en) 1994-01-25 1994-01-25 Compound pressure switch
DE4402036 1994-01-25

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EP0664422B1 true EP0664422B1 (en) 1997-04-02

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ATE151162T1 (en) 1997-04-15
EP0664422A1 (en) 1995-07-26
DE4402036A1 (en) 1995-07-27
DE59500157D1 (en) 1997-05-07
DE4402036C2 (en) 1997-06-12

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