DE10026002A1 - Device for monitoring a fan in a gas heater - Google Patents

Device for monitoring a fan in a gas heater

Info

Publication number
DE10026002A1
DE10026002A1 DE10026002A DE10026002A DE10026002A1 DE 10026002 A1 DE10026002 A1 DE 10026002A1 DE 10026002 A DE10026002 A DE 10026002A DE 10026002 A DE10026002 A DE 10026002A DE 10026002 A1 DE10026002 A1 DE 10026002A1
Authority
DE
Germany
Prior art keywords
fan
heating
sensor
air
exhaust gas
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.)
Ceased
Application number
DE10026002A
Other languages
German (de)
Inventor
Kersten Wehmeier
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to DE10026002A priority Critical patent/DE10026002A1/en
Priority to EP01110733A priority patent/EP1158244A1/en
Publication of DE10026002A1 publication Critical patent/DE10026002A1/en
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • F23N5/245—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electrical or electromechanical 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
    • F23N5/187—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using electrical or electromechanical 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
    • F23N2005/181—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of air
    • F23N2005/182—Air flow switch
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/02—Ventilators in stacks
    • 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

Abstract

Die Erfindung betrifft eine Vorrichtung zum Überwachen eines Gebläses in einem Gasheizgerät, mit einem im Luft- bzw. Abgasweg des Gerätes angeordneten Sensor, der einen elektrischen Steuerstromkreis entsprechend der Gebläseförderung beeinflußt. Der Sensor ist ein von der Luft bzw. dem Abgas angeströmter, temperaturabhängiger Widerstand (12) in einem Heizstromkreis, dessen Beheizung und Widerstandscharakteristik so gewählt sind, daß die durch die Strömung bewirkte Kühlung des Sensors eine auswertbare Widerstandsänderung gegenüber dem strömungsfreien Zustand bei nicht förderndem Gebläse zur Folge hat. Dadurch ergibt sich eine einfache und billige Ausführung der Vorrichtung, mit der sich feststellen läßt, ob eine Luft- bzw. Abgasströmung vorhanden ist oder nicht.The invention relates to a device for monitoring a fan in a gas heating device, with a sensor arranged in the air or exhaust gas path of the device, which influences an electrical control circuit in accordance with the fan delivery. The sensor is a temperature-dependent resistor (12) in the heating circuit which is flown by the air or the exhaust gas, the heating and resistance characteristics of which are selected such that the cooling of the sensor caused by the flow results in an evaluable change in resistance compared to the flow-free state with a non-conveying fan has the consequence. This results in a simple and inexpensive design of the device, with which it can be determined whether an air or exhaust gas flow is present or not.

Description

Die Erfindung bezieht sich auf eine Vorrichtung zum Überwachen eines Gebläses in einem Gasheizgerät nach der Gattung des Hauptanspruchs.The invention relates to a device for Monitoring a blower in a gas heater after the Genus of the main claim.

Stand der TechnikState of the art

Bei einer bekannten Vorrichtung dieser Gattung ist als Sensor ein Heizfilm-Anemometer im Luft- bzw. Abgasweg vorgesehen, das eine exakte Volumen- oder Massenstrombestimmung ermöglicht. Diese Ausführung ist aufgrund der geforderten hohen Genauigkeit recht aufwendig und für eine einfache Anordnung kostspielig, wenn mit ihr nur festgestellt werden soll, ob das Gebläse fördert oder nicht. Ferner ist es bekannt, im Luft- bzw. Abgasweg eine schwenkbar gelagerte Klappe anzuordnen, die durch den Strömungsdruck bewegbar ist und ihre Bewegungen auf ein Potentiometer im elektrischen Steuerstromkreis überträgt. Diese Anordnung hat gegeneinander bewegte Teile, die bekannten Probleme bezüglich Langzeitstabilität und Verschmutzung aufweisen.In a known device of this type is as Sensor a heating film anemometer in the air or exhaust gas path provided an exact volume or Mass flow determination enabled. This version is quite expensive due to the high accuracy required and expensive for easy arrangement when with it only to determine whether the blower is conveying or Not. Furthermore, it is known to have a in the air or exhaust gas path Arrange pivotally mounted flap through the Flow pressure is movable and their movements on a Potentiometer in the electrical control circuit transmits. This arrangement has mutually moving parts that known issues regarding long term stability and Have pollution.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Vorrichtung mit den kennzeichnenden Merkmalen des Hauptanspruchs ist einfacher und billiger als die zum Stand der Technik angeführte Anordnung und genügt in allen Anwendungsfällen einer robusten Detektion der Gebläsefunktion. Der verwendete Sensor besitzt nicht die Kondensatanfälligkeit.The device according to the invention with the characteristic Features of the main claim is easier and cheaper than the arrangement referred to the prior art and is sufficient in all applications of robust detection of Blower function. The sensor used does not have that Susceptibility to condensation.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der einzigen Figur der Zeichnung dargestellt.An embodiment of the invention is in the only one Figure of the drawing shown.

AusführungsbeispielEmbodiment

In einem Luftkanal 10 ist als Sensor ein temperaturabhängiger Heizwiderstand 12 angeordnet, der an ein Steuergerät 14 eines Gasheizgerätes angeschlossen ist, das ein in den Luftkanal 10 förderndes Gebläse steuert. Das Gebläse erzeugt im Luftkanal 10 eine Luftströmung 16. Bei nicht vorhandenem Luftstrom nimmt der Heizwiderstand 12 eine hohe Temperatur an, weil er nur wenig Wärme über das ihn umgebende Medium abgeben kann. Sein Widerstandswert wird sich dann entsprechend seiner Charakteristik auf einen oberen oder unteren Grenzwert einstellen.In an air duct 10 , a temperature-dependent heating resistor 12 is arranged as a sensor, which is connected to a control device 14 of a gas heating device, which controls a blower conveying into the air duct 10 . The fan produces an air flow 16 in the air duct 10 . If there is no air flow, the heating resistor 12 assumes a high temperature because it can only give off a little heat via the medium surrounding it. Its resistance value will then adjust to an upper or lower limit value according to its characteristics.

Wenn bei laufendem Gebläse eine Luftströmung 16 vorhanden ist, wird ein größerer Teil der im Heizwiderstand 12 erzeugten Wärme abgeleitet, wobei sich ein signifikant anderer Widerstandswert ergibt. Die Änderung der Widerstandswerte ergibt das gewünschte Sensorsignal.If an air flow 16 is present while the fan is running, a larger part of the heat generated in the heating resistor 12 is dissipated, resulting in a significantly different resistance value. The change in the resistance values gives the desired sensor signal.

Bei Anordnung des Heizwiderstandes 12 im Abgasweg müssen die elektrischen Werte so aufeinander abgestimmt sein, daß Schwankungen der Abgastemperatur das Sensorsignal nicht beeinträchtigen.When the heating resistor 12 is arranged in the exhaust gas path, the electrical values must be matched to one another in such a way that fluctuations in the exhaust gas temperature do not impair the sensor signal.

Claims (1)

Vorrichtung zum Überwachen eines Gebläses in einem Gasheizgerät, mit einem im Luft- bzw. Abgasweg des Gerätes angeordneten Sensor, der einen elektrischen Steuerstromkreis entsprechend der Gebläseförderung beeinflußt, dadurch gekennzeichnet, daß der Sensor ein von der Luft bzw. dem Abgas angeströmter temperaturabhängiger Widerstand (12) in einem Heizstromkreis ist, dessen Beheizung und Widerstandscharakteristik so gewählt sind, daß die durch die Strömung bewirkte Kühlung des Sensors eine auswertbare Widerstandsänderung gegenüber dem strömungsfreien Zustand bei nicht förderndem Gebläse zur Folge hat.Device for monitoring a blower in a gas heating device, with a sensor arranged in the air or exhaust gas path of the device, which influences an electrical control circuit corresponding to the blower delivery, characterized in that the sensor has a temperature-dependent resistance ( 12 ) in a heating circuit, the heating and resistance characteristics of which are selected so that the cooling of the sensor caused by the flow results in an evaluable change in resistance compared to the flow-free state with a non-conveying fan.
DE10026002A 2000-05-25 2000-05-25 Device for monitoring a fan in a gas heater Ceased DE10026002A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE10026002A DE10026002A1 (en) 2000-05-25 2000-05-25 Device for monitoring a fan in a gas heater
EP01110733A EP1158244A1 (en) 2000-05-25 2001-05-03 Device for monitoring a fan in a gas-fired heating apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE10026002A DE10026002A1 (en) 2000-05-25 2000-05-25 Device for monitoring a fan in a gas heater

Publications (1)

Publication Number Publication Date
DE10026002A1 true DE10026002A1 (en) 2001-12-06

Family

ID=7643581

Family Applications (1)

Application Number Title Priority Date Filing Date
DE10026002A Ceased DE10026002A1 (en) 2000-05-25 2000-05-25 Device for monitoring a fan in a gas heater

Country Status (2)

Country Link
EP (1) EP1158244A1 (en)
DE (1) DE10026002A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT412367B (en) * 2002-09-02 2005-01-25 Vaillant Gmbh METHOD FOR ADJUSTING THE FAN SPEED OF A FAN SUPPORTED HEATER

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005009017A1 (en) * 2005-02-28 2006-08-31 Kutzner + Weber Gmbh Combustion system e.g. for regulating combustion system according to its ventilation or exhaust actual conditions, has chamber having attached exit gas line for exhaust gases with controllable mechanism influencing operating conditions

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4331722A1 (en) * 1992-09-18 1994-03-24 Hitachi Ltd Air flow meter for vehicle engine control - contains heat generating resistance temp. sensor with controlled current source
EP0657722A2 (en) * 1993-12-07 1995-06-14 Hitachi, Ltd. A hot wire type air flowmeter

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3578987A (en) * 1968-12-09 1971-05-18 Dover Corp Resistance-sensing system with fail-safe circuit
JPS5855616A (en) * 1981-09-29 1983-04-02 Paloma Ind Ltd Safety device for forced feeding and discharging gas combustion unit
DE3870611D1 (en) * 1988-05-07 1992-06-04 Honeywell Bv CONTROL DEVICE FOR GAS BURNERS.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4331722A1 (en) * 1992-09-18 1994-03-24 Hitachi Ltd Air flow meter for vehicle engine control - contains heat generating resistance temp. sensor with controlled current source
EP0657722A2 (en) * 1993-12-07 1995-06-14 Hitachi, Ltd. A hot wire type air flowmeter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT412367B (en) * 2002-09-02 2005-01-25 Vaillant Gmbh METHOD FOR ADJUSTING THE FAN SPEED OF A FAN SUPPORTED HEATER
DE10340194B4 (en) * 2002-09-02 2012-08-16 Vaillant Gmbh Method for adjusting the fan speed of a fan-assisted heater

Also Published As

Publication number Publication date
EP1158244A1 (en) 2001-11-28

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