EP0614050B1 - Heater - Google Patents

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Publication number
EP0614050B1
EP0614050B1 EP94250047A EP94250047A EP0614050B1 EP 0614050 B1 EP0614050 B1 EP 0614050B1 EP 94250047 A EP94250047 A EP 94250047A EP 94250047 A EP94250047 A EP 94250047A EP 0614050 B1 EP0614050 B1 EP 0614050B1
Authority
EP
European Patent Office
Prior art keywords
pressure
gas
measuring channel
burner
blower
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94250047A
Other languages
German (de)
French (fr)
Other versions
EP0614050A1 (en
Inventor
Rolf Bächli
Peter Goebel
Roger Meier
Klaus Richter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
N.V. VAILLANT S.A.
Vaillant Austria GmbH
Vaillant GmbH
Vaillant Ltd
Original Assignee
Vaillant Austria GmbH
Nv Vaillant Sa
Joh Vaillant GmbH and Co
Vaillant GmbH
Vaillant SARL
Vaillant Ltd
Vaillant BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from AT171193A external-priority patent/AT401197B/en
Application filed by Vaillant Austria GmbH, Nv Vaillant Sa, Joh Vaillant GmbH and Co, Vaillant GmbH, Vaillant SARL, Vaillant Ltd, Vaillant BV filed Critical Vaillant Austria GmbH
Publication of EP0614050A1 publication Critical patent/EP0614050A1/en
Application granted granted Critical
Publication of EP0614050B1 publication Critical patent/EP0614050B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F23N1/027—Regulating fuel supply conjointly with air supply using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/16—Systems for controlling combustion using noise-sensitive detectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements 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
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/08—Microprocessor; Microcomputer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F23N2225/06—Measuring pressure for determining flow
    • 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
    • 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
    • F23N2235/20—Membrane 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

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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)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Feeding And Controlling Fuel (AREA)

Abstract

Heater having a burner which is supplied from a pipe for forming the gas mixture and upstream of which there is arranged a fan (blower) on the input side and which is assigned a gas feed pipe which projects through an air inlet into the pipe for forming the gas mixture and in which there is arranged a pressure measuring point which is intended for detecting the pressure of the mixture and is connected via a measurement channel to a gas fitting which controls a gas pressure control valve. The fan and a combustion chamber surrounding the burner are arranged in a low-pressure chamber provided with a feed opening for the fresh air. In order in the case of such a heater to detect an abnormal operating condition quickly, it is provided to arrange on the measurement channel (11) and on a further channel (12), which ends in the low-pressure chamber (4), an analogue pressure transmitter (6) which is connected to a tone decoder which, for its part, is connected to a tachometer generator which monitors the fan (1). In the event of deviation of the frequency response of the signal of the pressure transmitter (6) from a prescribed characteristic, the tone decoder supplies a blocking signal for the gas valve (16) as a function of the speed of the fan (1). <IMAGE>

Description

Die Erfindung bezieht sich auf eine Heizeinrichtung gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a heating device according to the preamble of claim 1.

Eine solche Heizeinrichtung wurde zum Beispiel durch die EP 479 216 bekannt. Bei diesen bekannten Heizeinrichtungen kommt es aufgrund von Unwuchten des Gebläses, aber auch von durch die Schaufeln des Gebläses verursachten Turbulenzen zu Schwingungen, die zu einer entsprechenden Lärmentwicklung führen. Außerdem ist es bei solchen Heizeinrichtungen wesentlich, mechanische Schäden, wie zum Beispiel Lagerschäden des Gebläses, frühzeitig zu erkennen, um Folgeschäden zu vermeiden, was bei den bekannten Heizeinrichtungen nur sehr schwer möglich ist.
Bekannt ist weiterhin eine in der JP-OS 92 301 200 offenbarte Einrichtung zum Abblasen von Überdruck in Abhängigkeit vom Geräusch eines Gebläses, wobei das Gebläsegeräusch mit einem Mikrofon erfaßt wird.Such a heating device was known for example from EP 479 216. In these known heating devices, vibrations occur due to unbalance of the fan, but also due to turbulence caused by the blades of the fan, which lead to a corresponding development of noise. In addition, with such heating devices, it is essential to detect mechanical damage, such as damage to the bearing of the fan, at an early stage in order to avoid consequential damage, which is very difficult to achieve with the known heating devices.
Also known is a device disclosed in JP-OS 92 301 200 for blowing off excess pressure as a function of the noise of a blower, the blower noise being recorded with a microphone.

Ziel der Erfindung ist es, eine Heizeinrichtung der eingangs erwähnten Art vorzuschlagen, die eine Erkennung von mechanischen Schäden auf einfache Weise ermöglicht.The aim of the invention is to propose a heating device of the type mentioned at the outset which enables mechanical damage to be detected in a simple manner.

Erfindungsgemäß wird dies durch die kennzeichnenden Merkmale des Patentanspruches 1 erreicht.According to the invention this is achieved by the characterizing features of patent claim 1.

Die im normalen Betrieb des Gebläses und des Brenners auftretenden Schwingungen, die durch kleine Unwuchten des Gebläses, aber auch die an den Schaufeln des Gebläses auftretenden Verwirbelungen bedingt sind, weisen eine gewisse Abhängigkeit von der Drehzahl des Gebläses auf. Dabei zeigen die Signale des analogen Drucksensors beim normalen Betrieb einen von der Drehzahl des Gebläses abhängigen Verlauf bezüglich deren Frequenz und deren Amplitude.The vibrations that occur during normal operation of the blower and the burner, which are caused by small unbalance of the blower, but also by the turbulence occurring on the blades of the blower, have a certain dependence on the speed of the blower. During normal operation, the signals from the analog pressure sensor show a curve dependent on the speed of the fan with regard to its frequency and its amplitude.

Weicht der Verlauf des Signales des Drucksensors von einem vorgegebenen Muster ab, so wird dies von dem Tondecoder erkannt. Dadurch kann der Brenner rasch stillgesetzt werden.If the course of the signal of the pressure sensor deviates from a predetermined pattern, this is recognized by the sound decoder. This allows the burner to be shut down quickly.

Weiter kann vorgesehen sein, daß dem Drucksensor gemäß Anspruch 2 ein Speicher für Störschwingungen zugeordnet ist. Auf diese Weise ist es möglich, zu erkennen, ob Störschwingungen vorgelegen haben, die zu einer Auslösung eines Sperrsignals für die Gasventile sowie zu Drehzahländerungen des Gebläses geführt haben.It can further be provided that a memory for interference vibrations is assigned to the pressure sensor. In this way, it is possible to recognize whether there have been disturbing vibrations that have triggered a blocking signal for the gas valves and changes in the speed of the fan.

Nach den Merkmalen gemäß Anspruch 3 ergeben sich sehr kurze Meßkanäle, wodurch die Druckschwankungen kaum gedämpft werden.According to the features of claim 3, there are very short measuring channels, whereby the pressure fluctuations are hardly damped.

Mit der Differenzdruckmesser-Ausbildung nach Anspruch 4 können die Unwuchten und die durch die Schaufelblätter des Gebläses hervorgerufenen Turbulenzen beziehungsweise die durch diese hervorgerufenen Druckschwankungen auf einfache Weise erfaßt werden.With the differential pressure meter design according to claim 4, the unbalance and the turbulence caused by the blades of the fan or the pressure fluctuations caused by this can be detected in a simple manner.

Nach einer Abschaltung des Brenners aufgrund eines Sperrsignales des Tondecoders kann bei einer nachfolgenden Wiedereinschaltung des Brenners die Drehzahl des Gebläses auf einen Wert gebracht werden, der zumindest um 50 % über jenem bei der Abschaltung des Brenners liegt. Nach mehrmaligem Abschalten aufgrund eines Sperrsignals des Tondecoders innerhalb einer bestimmten Zeit wird der Brenner verriegelnd abgeschaltet. Auf diese Weise ist es möglich, auftretende Brennkammerschwingungen nicht nur zu erfassen, sondern bevor sie zu einem hohen Geräuschpegel führen, den Brenner abzustellen. Gleichzeitig wird dadurch auch die Erkennung von mechanischen Schäden des Brenners beziehungsweise seines Gebläses ermöglicht. Von einem solchen ist dann auszugehen, wenn der Verlauf des Signales des analogen Drucksensors auch nach einem mehrmaligen, zum Beispiel einem dreimaligen Start des Brenners nicht einem vorgegebenen Muster entspricht.After the burner has been switched off due to a blocking signal from the sound decoder, when the burner is subsequently switched on again, the speed of the fan can be brought to a value which is at least 50% above that when the burner was switched off. After switching off several times due to a blocking signal from the sound decoder, the burner is switched off in a locking manner. In this way it is possible to not only detect combustion chamber vibrations, but before they lead to a high noise level, switch off the burner. At the same time, this also enables mechanical damage to the burner or its fan to be detected. This is to be assumed if the course of the signal of the analog pressure sensor does not correspond to a predetermined pattern even after the burner has been started several times, for example three times.

Weiter kann gemäß Anspruch 5 ein Protokollierspeicher mit Protokollierschnittstelle vorgesehen sein, wodurch es für den Kundendienst durch einfaches Anschließen eines Lesegerätes an die Protokollierschnittstelle möglich ist, die Anzahl der Störabschaltungen abzufragen und entsprechende Wartungsintervalle festzulegen.Furthermore, a logging memory with a logging interface can be provided, whereby it is possible for the customer service by simply connecting a reader to the logging interface to query the number of lockouts and to set corresponding maintenance intervals.

Die Erfindung wird nun anhand der Zeichnung näher erläutert.The invention will now be explained in more detail with reference to the drawing.

Dabei zeigen:

  • Figur 1 eine erfindungsgemäße Heizeinrichtung,
  • Figur 2 ein Funktionsschema einer Gasarmatur der Heizeinrichtung nach der Figur 1 und
  • Figur 3 schematisch einen Drucksensor mit einem Drucktransmitter.
Show:
  • FIG. 1 shows a heating device according to the invention,
  • FIG. 2 shows a functional diagram of a gas fitting of the heating device according to FIGS. 1 and
  • Figure 3 schematically shows a pressure sensor with a pressure transmitter.

Die Heizeinrichtung nach der Figur 1 weist ein Gebläse 1 auf, das mit einem Gasgemisch-Bildungsrohr 2 versehen ist, das in einer von einem Gehäuse 10 umgebenen Unterdruckkammer 4 endet.The heating device according to FIG. 1 has a blower 1 which is provided with a gas mixture formation tube 2 which ends in a vacuum chamber 4 surrounded by a housing 10.

In das Gasgemisch-Bildungsrohr 2 ragt koaxial ein Gaszuführrohr 3 hinein, welches die Wand des Gehäuses 10 durchsetzt und Teil einer Konsole 9 ist, die an der Außenseite des Gehäuses 10 befestigt ist und zusammen mit einem Gasregelblock eine Gasarmatur 5 bildet.A gas feed pipe 3 projects coaxially into the gas mixture formation tube 2 and passes through the wall of the housing 10 and is part of a console 9 which is on the outside of the Housing 10 is attached and forms a gas valve 5 together with a gas control block.

An der Konsole 9 ist neben dem Gasregelblock ein Drucksensor 6 mit einem Drucktransmitter 26 (Figuren 2 und 3) angeordnet, der über einen abschnittweise an der Außenseite des Gaszuführrohres 3 verlaufenden Meßkanal 11 den Druck PK im Inneren des Gasgemisch-Bildungsrohres 2 und über einen weiteren, im Inneren der Unterdruckkammer 4 endenden Meßkanal 12 den Druck PL in der Unterdruckkammer 4 erfaßt.On the console 9, in addition to the gas control block, a pressure sensor 6 with a pressure transmitter 26 (FIGS. 2 and 3) is arranged which, via a measuring channel 11 running in sections on the outside of the gas supply pipe 3, the pressure P K inside the gas mixture formation pipe 2 and via a further, measuring channel 12 ending in the interior of the vacuum chamber 4 detects the pressure P L in the vacuum chamber 4.

Die Unterdruckkammer 4 weist eine Luftzuführöffnung 13 auf und ist im übrigen dicht ausgebildet. Dabei ist die Luftzuführöffnung 13 von einem Abgasrohr 14 durchsetzt, das an einen Brennraum 8 angeschlossen ist.The vacuum chamber 4 has an air supply opening 13 and is otherwise tight. The air supply opening 13 is penetrated by an exhaust pipe 14, which is connected to a combustion chamber 8.

An der Oberseite des Brennraumes 8 ist das Gebläse 1 angeflanscht, während innerhalb des Brennraumes 8 ein Brenner 7 und ein Wärmetauscher 15 angeordnet sind.The fan 1 is flanged to the top of the combustion chamber 8, while a burner 7 and a heat exchanger 15 are arranged within the combustion chamber 8.

Die Figur 2 zeigt schematisch die Funktion der Gasarmatur 5. Das Gas strömt über zwei Gasventile 16 zu einem Druckregler 17. Dieser ist mit einem Druckgeber 27 ausgestattet, dem über den Meßkanal 11 und den Meßkanal 12 der Druckwert PK im Gasgemisch-Bildungsrohr 2 und der Druckwert PL im Inneren der Unterdruckkammer 4 zugeführt wird, wobei der Druckregler 17 nach diesen Werten den Gasdruck regelt. Über ein Hauptdurchsatz-Drosselventil 18 und eine Düse 19 strömt das Gas zum Gaszuführrohr 3.FIG. 2 schematically shows the function of the gas fitting 5. The gas flows via two gas valves 16 to a pressure regulator 17. This is equipped with a pressure transmitter 27, to which the pressure value P K in the gas mixture formation tube 2 and 2 is measured via the measuring channel 11 and the measuring channel 12 the pressure value P L is fed inside the vacuum chamber 4, the pressure regulator 17 regulating the gas pressure according to these values. The gas flows to the gas supply pipe 3 via a main throughput throttle valve 18 and a nozzle 19.

An den Meßkanal 11 und den weiteren Meßkanal 12 ist darüber hinaus, quasi über Verzweigungen, der Drucktransmitter 26 angeschlossen.The pressure transmitter 26 is also connected to the measuring channel 11 and the further measuring channel 12, more or less via branches.

Dieser Drucktransmitter 26 ist in der Figur 3 schematisch dargestellt.This pressure transmitter 26 is shown schematically in FIG. 3.

Der durch ein Gehäuse 20 begrenzte Raum ist durch eine Membrane 21 unterteilt, wobei die beiden Seiten der Membrane 21 mit dem Druck PL beziehungsweise dem Druck PK beaufschlagt sind. Diese Membrane 21 wird durch Druckschwankungen an ihren beiden Seiten in Schwingungen versetzt und wirkt über einen Fortsatz 28 und einen Anschlag 29 auf einen Keramikbiegebalken 22 mit aufgesetzter Elektronik 23 ein, die ein den Druckschwankungen entsprechendes Signal liefert.The space delimited by a housing 20 is divided by a membrane 21, the two sides of the membrane 21 being acted upon by the pressure P L or the pressure P K. This membrane 21 is caused to oscillate by pressure fluctuations on its two sides and acts via an extension 28 and a stop 29 on a ceramic bending beam 22 with electronics 23 attached, which supplies a signal corresponding to the pressure fluctuations.

Dieses Signal wird einem Tondecoder 24 zugeführt und mit einem in einem Speicher 25 (Figur 2) vorgegebenen Signalmuster, das jeweils einer bestimmten Drehzahl des Gebläses 1 entspricht, in einem Vergleicher 30 (Figur 2) verglichen. Entspricht der Signalverlauf des Drucksensors 6 nicht dem vorgegebenen, so gibt der Vergleicher 30 ein Sperrsignal an eines der Gasventile 16 ab, wodurch der Brenner 7 stillgesetzt wird. Danach kann der Brenner 7 mit höherer Drehzahl des Gebläses 1 wieder gestartet werden.This signal is fed to a sound decoder 24 and compared in a comparator 30 (FIG. 2) with a signal pattern which is predetermined in a memory 25 (FIG. 2) and which corresponds in each case to a specific speed of the blower 1. If the signal curve of the pressure sensor 6 does not correspond to the predefined one, the comparator 30 emits a blocking signal to one of the gas valves 16, as a result of which the burner 7 is stopped. Then the burner 7 can be started again at a higher speed of the fan 1.

Claims (5)

  1. Heating arrangement with a burner (7) fuelled from a gas mixture formation tube (2), such burner having a blower (1) on its input side and, via a gas supply control unit (5) including gas valves (16), a gas pressure control valve (17) and a gas nozzle (19), being associated with a gas feeder tube (3) which extends through an air inlet and projects into the gas mixture formation tube (2), with a first measuring channel (11) for measuring the mixture pressure (PK) ending in the said mixture formation tube (2), such measuring channel being connected with a pressure controller (27) of the gas pressure control valve (17) of the gas supply control unit (5), and with the blower (1 ) and a combustion chamber (8) which surrounds the burner (7) being arranged in a partial-vacuum chamber (4) provided with an open-ing (13) for admitting fresh air, with a second measuring channel (12) for measuring the pressure (PL) ending in the said partial-vacuum chamber (4), such second measuring channel being likewise connected with the said pressure controller (27), characterized in that, in addition to the pressure controller (27) there is linked to the first measuring channel (11) and to the second measuring channel (12) an analogous pressure sensor (6) comprising a sound decoder (24) which, in turn, is connected with a tachogenerator monitoring the blower (1), with the sound decoder (24), in the event that the frequency response of the signal of the pressure sensor (5) deviates from the response characteristic predetermined by the speed of the blower, supplying an inhibiting signal for the gas valves (16).
  2. Heating arrangement as claimed in Claim 1, characterized in that the pressure sensor (6) is associated with a storage for disturbing oscillations.
  3. Heating arrangement as claimed in Claims 1 or 2, characterized in that the first measuring channel (11) and the second measuring channel (12) ending in the partial-vacuum chamber (4) extend through a connecting bracket (9) which is provided on the outside of the partial-vacuum chamber (4) and accommodates both the gas supply control unit (5) and the pressure sensor (6).
  4. Heating arrangement as claimed in Claims 1 to 3, characterized in that the analogous pressure sensor (6) is designed as a differential pressure gauge whose two pressure chambers are connected with the first measuring channel (11) and the second measuring channel (12).
  5. Heating arrangement as claimed in Claims 1 to 4, characterized in that a control device comprising a microprocessor is provided, which is linked with a recording memory capable of storing the interruptions caused by the inhibiting signal of the sound decoder (24) and reading out the stored data via a recording interface.
EP94250047A 1993-03-04 1994-02-24 Heater Expired - Lifetime EP0614050B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4307274 1993-03-04
DE4307274 1993-03-04
AT1711/93 1993-08-26
AT171193A AT401197B (en) 1993-08-26 1993-08-26 Heating appliance

Publications (2)

Publication Number Publication Date
EP0614050A1 EP0614050A1 (en) 1994-09-07
EP0614050B1 true EP0614050B1 (en) 1997-07-23

Family

ID=25596624

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94250047A Expired - Lifetime EP0614050B1 (en) 1993-03-04 1994-02-24 Heater

Country Status (3)

Country Link
EP (1) EP0614050B1 (en)
AT (1) ATE155868T1 (en)
DE (2) DE59403418D1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2765313B1 (en) * 1997-06-27 1999-09-17 Europ Equip Menager TOTAL PREMIX GAS BURNER FOR DOMESTIC COOKING
DE19824521B4 (en) * 1998-06-02 2004-12-23 Honeywell B.V. Control device for gas burners
EP1146288A1 (en) * 2000-04-13 2001-10-17 Cybertech Ventures, Inc. Proportional control gas valve
US10281351B2 (en) * 2012-11-19 2019-05-07 A. O. Smith Corporation Water heater and pressure probe for a water heater
DE102020132504A1 (en) * 2020-12-07 2022-06-09 Ebm-Papst Landshut Gmbh throttle assembly

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2395995A (en) * 1945-03-19 1946-03-05 Fluor Corp Vibration-responsive control for cooling tower fans
US4706881A (en) * 1985-11-26 1987-11-17 Carrier Corporation Self-correcting microprocessor control system and method for a furnace
US4959638A (en) * 1987-12-09 1990-09-25 The United States Of America As Represented By The Secretary Of The Navy Combustion efficiency analyzer, acoustic
JPH04301200A (en) * 1991-03-29 1992-10-23 Hitachi Ltd Control method of surging of fluid machinery

Also Published As

Publication number Publication date
DE59403418D1 (en) 1997-08-28
DE9403329U1 (en) 1994-06-16
EP0614050A1 (en) 1994-09-07
ATE155868T1 (en) 1997-08-15

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