EP0905458A2 - Gas fired water heater with flue gas control - Google Patents

Gas fired water heater with flue gas control Download PDF

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Publication number
EP0905458A2
EP0905458A2 EP98110113A EP98110113A EP0905458A2 EP 0905458 A2 EP0905458 A2 EP 0905458A2 EP 98110113 A EP98110113 A EP 98110113A EP 98110113 A EP98110113 A EP 98110113A EP 0905458 A2 EP0905458 A2 EP 0905458A2
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EP
European Patent Office
Prior art keywords
exhaust gas
water heater
temperature sensor
exhaust
flow control
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.)
Withdrawn
Application number
EP98110113A
Other languages
German (de)
French (fr)
Other versions
EP0905458A3 (en
Inventor
Peter Reicherter
Heinz-Peter Schricks
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
Publication of EP0905458A2 publication Critical patent/EP0905458A2/en
Publication of EP0905458A3 publication Critical patent/EP0905458A3/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
    • F24H9/2042—Preventing or detecting the return of combustion gases
    • F24H9/205—Closing the energy supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/112—Preventing or detecting blocked flues
    • F24H15/116—Disabling the heating means in response thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/235—Temperature of exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/355—Control of heat-generating means in heaters
    • F24H15/36—Control of heat-generating means in heaters of burners

Definitions

  • the invention is based on a gas-fired water heater according to the genus of the main claim.
  • a safety device for a gas heated Water heater has become known in which a Temperature sensor for recording exhaust gas backlog outside the housing of the flow control or Train interrupter and at the level of one on the back the flow securing opening is arranged.
  • This arrangement has the advantage that in normal operation in particular from the flow control housing and thermal radiation acting on the temperature sensor is reduced and, in the event of security, through an opening exhaust gases flowing back into the flow control are detected.
  • the opening for the backlog exhaust gases as well as the Holding device for the exhaust gas temperature sensor are in maintenance-friendly way on an exhaust pipe connection for the flow control provided.
  • Figure 1 shows a side view of one Flow protection of a gas-heated water heater arranged exhaust pipe connection with a Monitoring device for back-up exhaust gas
  • Figure 2 a view of the arrangement in the direction of arrow A in Figure 1
  • Figure 3 is a plan view of the arrangement in Direction of arrow B in Figure 1.
  • Figure 1 shows a housing 10 of a flow control for a gas-fired water heater.
  • an exhaust pipe connection 12 provided the connection for a not shown Exhaust pipe forms.
  • At the exhaust pipe connection 12 is one Holding device 14 for an exhaust gas temperature sensor 16 intended.
  • the holding device 14 is U-shaped trained bracket, both of which Leg ends are attached to the exhaust pipe connection 12.
  • At the Exhaust pipe connection 12 is on the side at the level of Exhaust gas temperature sensor 16 has an opening 18 in which As FIG. 3 shows, an exhaust gas temperature sensor 16 leading guide tube 20 is attached.
  • the flow control 10 fulfills the two for a room air operated gas heated water heater known functions - on the one hand, it works through the side-mounted Openings 22 as a train interrupter for the in operation combustion gases rising above and on the other hand in the event of security, the opposite of the flow direction of the Combustion gases accumulate exhaust gases through the the flow guide 10 provided guide vanes 24th and via the guide tube 20 in the installation room of the derived from gas-fired water heaters.
  • FIGS 4 and 5 show the normal operation of a gas-fired water heater.
  • the one schematically Burner 26 shown generated in a combustion chamber 28 Combustion gases interact with one above the combustion chamber 28 arranged water-carrying Heat exchanger 30 and leave as exhaust gases cooled down the flow safety device 10 and the adjoining one Exhaust pipe the water heater.
  • the operation of the Water heater outgoing from the flow control 10 Heat radiation is arranged on the exhaust pipe connection 12
  • Exhaust gas temperature sensor 16 is compared to the known Versions in which the exhaust gas temperature sensor is inside the housing of the flow control is arranged, low, especially since the secondary air rising behind the water heater (dashed arrow in Fig. 4) the exhaust gas temperature sensor 16 additionally cools.
  • An NTC sensor or a can be used as the exhaust gas temperature sensor 16
  • Thermostat sensors can be used.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

The monitor has a temperature sensor (16) for detecting a build up of flue gases located outside the casing (10) of the draught diverter. It is positioned at the height of an opening provided in the flue pipe socket (12). Under normal conditions it is unaffected by heat radiation from the casing and should there be a back draught is heated by the flow of flue gas from the opening.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem gasbeheizten Wassererhitzer nach der Gattung des Hauptanspruchs. Aus der EP 744 582 A1 ist eine Sicherheitseinrichtung für einen gasbeheizten Wassererhitzer bekannt geworden, bei dem ein Temperaturfühler zur Erfassung von Abgasrückstau außerhalb des Gehäuses der Strömungssicherung bzw. des Zugunterbrechers und auf der Höhe einer auf der Rückseite der Strömungssicherung angebrachten Öffnung angeordnet ist. Diese Anordnung hat den Vorteil, daß im Normalbetrieb die insbesondere vom Gehäuse der Strömungssicherung ausgehende und auf den Temperaturfühler einwirkende Wärmestrahlung reduziert ist und im Sicherheitsfall die durch eine Öffnung der Strömungssicherung rückströmenden Abgase erfaßt werden.The invention is based on a gas-fired water heater according to the genus of the main claim. From EP 744 582 A1 is a safety device for a gas heated Water heater has become known in which a Temperature sensor for recording exhaust gas backlog outside the housing of the flow control or Train interrupter and at the level of one on the back the flow securing opening is arranged. This arrangement has the advantage that in normal operation in particular from the flow control housing and thermal radiation acting on the temperature sensor is reduced and, in the event of security, through an opening exhaust gases flowing back into the flow control are detected.

Vorteile der ErfindungAdvantages of the invention

Der erfindungsgemäße gasbeheizte Wassererhitzer mit den Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß die Positionierung des Abgastemperaturfühlers im Zusammenwirken mit der in der Abgasleitung vorgesehenen Öffnung nicht mehr von der Geometrie der Strömungssicherung abhängig ist. Damit kann die Abgasüberwachungseinrichtung universell bei gasbeheizten Wassererhitzern mit unterschiedlichen Leistungsstufen eingesetzt werden, da die sich an die Strömungssicherung anschließende Abgasabführung standardisiert ist.The gas-heated water heater according to the invention with the In contrast, features of the main claim have the advantage that the positioning of the exhaust gas temperature sensor in Interact with that provided in the exhaust pipe Opening no longer from the geometry of the flow control is dependent. This allows the exhaust gas monitoring device universal with gas-heated water heaters different power levels can be used because the exhaust gas discharge connected to the flow control is standardized.

Durch die in den Unteransprüchen aufgeführten Merkmale sind vorteilhafte Ausgestaltungen des gasbeheizten Wassererhitzers möglich.By the features listed in the subclaims advantageous embodiments of the gas-heated Water heater possible.

Durch ein zwischen der Öffnung in der Abgasabführung und dem Abgastemperaturfühler angeordnetes Leitrohr ist in vorteilhafter Weise sichergestellt, daß bei einem Rückstau der Abgase diese über die Öffnung und das Leitrohr direkt dem Abgastemperaturfühler zugeführt werden, wodurch eine schnelle Ansprechzeit für das Abschalten der Anlage gewährleistet ist.By a between the opening in the exhaust and the Exhaust temperature sensor arranged guide tube is in advantageously ensured that with a backflow the exhaust gases directly through the opening and the guide tube be supplied to the exhaust gas temperature sensor, whereby a fast response time for switching off the system is guaranteed.

Die Beabstandung des Temperaturfühlers von der in der Abgasabführung angeordneten Öffnung wird in vorteilhafter Weise durch ein U-förmig gewinkeltes Halteblech gewährleistet, wobei die beiden Schenkelenden des Halteblechs an der Abgasabführung befestigt sind.The spacing of the temperature sensor from that in the Exhaust gas discharge opening is advantageous Way through a U-shaped bracket guaranteed, the two leg ends of the Retaining plate are attached to the exhaust pipe.

Die Öffnung für die rückstauenden Abgase sowie die Haltevorrichtung für den Abgastemperaturfühler sind in wartungsfreundlicher Weise an einem Abgasrohranschluß für die Strömungssicherung vorgesehen.The opening for the backlog exhaust gases as well as the Holding device for the exhaust gas temperature sensor are in maintenance-friendly way on an exhaust pipe connection for the flow control provided.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Figur 1 zeigt die Seitenansicht eines an einer Strömungssicherung eines gasbeheizten Wassererhitzers angeordneten Abgasrohranschlusses mit einer Überwachungseinrichtung für rückstauendes Abgas, Figur 2 eine Ansicht der Anordnung in Richtung des Pfeiles A in Figur 1 und Figur 3 eine Draufsicht auf die Anordnung in Richtung des Pfeiles B in Figur 1.An embodiment of the invention is in the drawing shown and in the following description explained. Figure 1 shows a side view of one Flow protection of a gas-heated water heater arranged exhaust pipe connection with a Monitoring device for back-up exhaust gas, Figure 2 a view of the arrangement in the direction of arrow A in Figure 1 and Figure 3 is a plan view of the arrangement in Direction of arrow B in Figure 1.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Figur 1 zeigt ein Gehäuse 10 einer Strömungssicherung für einen gasbeheizten Wassererhitzer. Am oberen Ende der Strömungssicherung 10 ist ein Abgasrohranschluß 12 vorgesehen, der den Anschluß für eine nicht dargestellte Abgasleitung bildet. Am Abgasrohranschluß 12 ist eine Haltevorrichtung 14 für einen Abgastemperaturfühler 16 vorgesehen. Die Haltevorrichtung 14 ist als U-förmig ausgebildetes Halteblech ausgebildet, dessen beide Schenkelenden am Abgasrohranschluß 12 befestigt sind. Am Abgasrohranschluß 12 ist seitlich auf der Höhe des Abgastemperaturfühlers 16 eine Öffnung 18 angeordnet, in der wie Figur 3 zeigt, ein zum Abgastemperaturfühler 16 führendes Leitrohr 20 befestigt ist. Die Strömungssicherung 10 erfüllt die beiden für einen raumluftabhängig betriebenen gasbeheizten Wassererhitzer bekannten Funktionen - einerseits wirkt sie durch die seitlich angebrachten Öffnungen 22 als Zugunterbrecher für die im Betrieb nach oben aufsteigenden Verbrennungsgase und andererseits werden im Sicherheitsfall die entgegen der Strömungsrichtung der Verbrennungsgase sich rückstauenden Abgase über die dafür an der Strömungssicherung 10 vorgesehenen Leitschaufeln 24 sowie über das Leitrohr 20 in den Aufstellungsraum des gasbeheizten Wassererhitzers abgeleitet. Figure 1 shows a housing 10 of a flow control for a gas-fired water heater. At the top of the Flow safety device 10 is an exhaust pipe connection 12 provided the connection for a not shown Exhaust pipe forms. At the exhaust pipe connection 12 is one Holding device 14 for an exhaust gas temperature sensor 16 intended. The holding device 14 is U-shaped trained bracket, both of which Leg ends are attached to the exhaust pipe connection 12. At the Exhaust pipe connection 12 is on the side at the level of Exhaust gas temperature sensor 16 has an opening 18 in which As FIG. 3 shows, an exhaust gas temperature sensor 16 leading guide tube 20 is attached. The flow control 10 fulfills the two for a room air operated gas heated water heater known functions - on the one hand, it works through the side-mounted Openings 22 as a train interrupter for the in operation combustion gases rising above and on the other hand in the event of security, the opposite of the flow direction of the Combustion gases accumulate exhaust gases through the the flow guide 10 provided guide vanes 24th and via the guide tube 20 in the installation room of the derived from gas-fired water heaters.

Anhand der Figuren 4 bis 7 wird im nachfolgenden die Funktionsweise der Abgasüberwachungseinrichtung erläutert. Die Figuren 4 und 5 zeigen den Normalbetrieb eines gasbeheizten Wassererhitzers. Die von einem schematisch dargestellten Brenner 26 in einer Brennkammer 28 erzeugten Verbrennungsgase treten in Wechselwirkung mit einem oberhalb der Brennkammer 28 angeordneten wasserführenden Wärmeübertrager 30 und verlassen als Abgase abgekühlt über die Strömungssicherung 10 und die sich daran anschließende Abgasleitung den Wassererhitzer. Die beim Betrieb des Wassererhitzers von der Strömungssicherung 10 ausgehende Wärmestrahlung auf den am Abgasrohranschluß 12 angeordneten Abgastemperaturfühler 16 ist gegenüber den bekannten Ausführungen, bei denen der Abgastemperaturfühler innerhalb des Gehäuses der Strömungssicherung angeordnet ist, gering, zumal die hinter dem Wassererhitzer aufsteigende Nebenluft (strichlinierter Pfeil in Fig. 4) den Abgastemperaturfühler 16 zusätzlich kühlt.Based on Figures 4 to 7, the Operation of the exhaust gas monitoring device explained. Figures 4 and 5 show the normal operation of a gas-fired water heater. The one schematically Burner 26 shown generated in a combustion chamber 28 Combustion gases interact with one above the combustion chamber 28 arranged water-carrying Heat exchanger 30 and leave as exhaust gases cooled down the flow safety device 10 and the adjoining one Exhaust pipe the water heater. The operation of the Water heater outgoing from the flow control 10 Heat radiation is arranged on the exhaust pipe connection 12 Exhaust gas temperature sensor 16 is compared to the known Versions in which the exhaust gas temperature sensor is inside the housing of the flow control is arranged, low, especially since the secondary air rising behind the water heater (dashed arrow in Fig. 4) the exhaust gas temperature sensor 16 additionally cools.

Wenn es jedoch aufgrund von ungünstigen Wetterbedingungen bzw. bei Verstopfung der Abgasleitung zu einem Rückstau der Abgase kommt, treten diese wie in Figur 6 und 7 anhand der Pfeile dargestellt sowohl über die seitlich im Abgasrohranschluß 12 angeordnete Öffnung 18 und über die seitlich in der Strömungssicherung 10 angeordneten Öffnungen 22 in den Aufstellungsraum des Wassererhitzers. Die über die Öffnung 18 und das Leitrohr 20 am Abgastemperaturfühler 16 vorbeistreichenden Abgase werden erfaßt und der Wassererhitzer über ein entsprechendes Signal bis zur Beseitigung der Betriebsstörung stillgesetzt. However, if it is due to adverse weather conditions or in the event of a blockage in the exhaust pipe leading to a backflow Exhaust comes, these occur as in Figures 6 and 7 using the Arrows shown both over the side in the Exhaust pipe connection 12 arranged opening 18 and over the Openings arranged laterally in the flow control 10 22 in the installation room of the water heater. The over the Opening 18 and the guide tube 20 on the exhaust gas temperature sensor 16 passing exhaust gases are recorded and the Water heater via a corresponding signal up to Elimination of the malfunction stopped.

Aufgrund der Reduzierung der auf den Abgastemperaturfühler 16 einwirkenden Wärmestrahlung im Normalbetrieb des Wassererhitzers kann die Schwellwertgrenze für das Auslösen eines Sicherheitsfalls niedrig und unabhängig von der momentan eingestellten Heizleistung gewählt werden. Dies gewährleistet ein schnelles und sicheres Abschalten der Anlage.Due to the reduction in the exhaust gas temperature sensor 16 heat radiation during normal operation of the Water heater can set the threshold for triggering of a security case low and independent of the currently set heating output can be selected. This ensures a quick and safe shutdown of the Investment.

Als Abgastemperaturfühler 16 kann ein NTC-Sensor oder ein Thermostat-Fühler eingesetzt werden.An NTC sensor or a can be used as the exhaust gas temperature sensor 16 Thermostat sensors can be used.

Claims (4)

Gasbeheizter Wassererhitzer mit einer Abgasüberwachungseinrichtung, die eine Strömungssicherung und einen außerhalb der Strömungssicherung angeordneten Temperaturfühler zur Erfassung der Abgastemperatur bei Rückstau der Abgase aufweist, dadurch gekennzeichnet, daß der Abgastemperaturfühler (16) auf der Höhe einer in einer Abgasabführung (12) angeordneten Öffnung (18) angeordnet ist.Gas heated water heater with one Exhaust gas monitoring device that has a flow control and one arranged outside the flow control Temperature sensor for recording the exhaust gas temperature at Backflow of the exhaust gases, characterized in that the exhaust gas temperature sensor (16) at the level of one Exhaust gas discharge (12) arranged opening (18) arranged is. Gasbeheizter Wassererhitzer nach Anspruch 1, dadurch gekennzeichnet, daß zwischen der in der Abgasabführung (12) angeordneten Öffnung (18) und dem Abgastemperaturfühler (16) ein Leitrohr (20) vorgesehen ist.Gas-heated water heater according to claim 1, characterized characterized in that between the in the exhaust gas discharge (12) arranged opening (18) and the exhaust gas temperature sensor (16) a guide tube (20) is provided. Gasbeheizter Wassererhitzer nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Abgastemperaturfühler (16) an einem U-förmig gewinkelten Halteblech (14) angeordnet ist, deren beiden Schenkelenden an der Abgasabführung (12) befestigt sind.Gas-heated water heater according to claim 1 or 2, characterized in that the exhaust gas temperature sensor (16) arranged on a U-shaped bracket (14) is, the two ends of the legs at the exhaust gas discharge (12) are attached. Gasbeheizter Wassererhitzer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Abgastemperaturfühler (16) an einem Abgasrohranschluß (12) für die Strömungssicherung (10) angeordnet ist.Gas-heated water heater according to one of the previous ones Claims, characterized in that the Exhaust gas temperature sensor (16) on an exhaust pipe connection (12) is arranged for the flow control (10).
EP98110113A 1997-09-24 1998-06-03 Gas fired water heater with flue gas control Withdrawn EP0905458A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29717072U DE29717072U1 (en) 1997-09-24 1997-09-24 Gas heated water heater with exhaust gas monitoring device
DE29717072U 1997-09-24

Publications (2)

Publication Number Publication Date
EP0905458A2 true EP0905458A2 (en) 1999-03-31
EP0905458A3 EP0905458A3 (en) 2000-05-17

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Application Number Title Priority Date Filing Date
EP98110113A Withdrawn EP0905458A3 (en) 1997-09-24 1998-06-03 Gas fired water heater with flue gas control

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DE (1) DE29717072U1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6703509B2 (en) * 2000-02-07 2004-03-09 Merck Patent Gmbh Method for producing 5-aryl nicotinaldehydes
EP1845318A2 (en) * 2006-04-10 2007-10-17 Vaillant GmbH Method for monitoring a flow safety device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0744582A1 (en) 1995-05-26 1996-11-27 SAUNIER DUVAL EAU CHAUDE CHAUFFAGE S.D.E.C.C. - Société anonyme Safety device preventing the return of combustion gases in bath heaters or gas-fired boilers

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2260517B2 (en) * 1972-12-11 1975-11-06 Wamsler-Herd- Und Ofen Gmbh, 8000 Muenchen Backflow protection for a gas space heater

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0744582A1 (en) 1995-05-26 1996-11-27 SAUNIER DUVAL EAU CHAUDE CHAUFFAGE S.D.E.C.C. - Société anonyme Safety device preventing the return of combustion gases in bath heaters or gas-fired boilers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6703509B2 (en) * 2000-02-07 2004-03-09 Merck Patent Gmbh Method for producing 5-aryl nicotinaldehydes
USRE41008E1 (en) 2000-02-07 2009-11-24 Merck Patent Gmbh Method for producing 5-aryl nicotinaldehydes
EP1845318A2 (en) * 2006-04-10 2007-10-17 Vaillant GmbH Method for monitoring a flow safety device

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Publication number Publication date
EP0905458A3 (en) 2000-05-17
DE29717072U1 (en) 1999-02-04

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