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EP0881439A2 - Gas fired water heater with a flue gas collecting hood - Google Patents

Gas fired water heater with a flue gas collecting hood Download PDF

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Publication number
EP0881439A2
EP0881439A2 EP98106557A EP98106557A EP0881439A2 EP 0881439 A2 EP0881439 A2 EP 0881439A2 EP 98106557 A EP98106557 A EP 98106557A EP 98106557 A EP98106557 A EP 98106557A EP 0881439 A2 EP0881439 A2 EP 0881439A2
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
water heater
flow
temperature sensor
tank
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Withdrawn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
EP98106557A
Other languages
German (de)
French (fr)
Other versions
EP0881439A3 (en
Inventor
Peter Reicherter
Heinz-Peter Schricks
Daniel Sehmann
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 EP0881439A2 publication Critical patent/EP0881439A2/en
Publication of EP0881439A3 publication Critical patent/EP0881439A3/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Withdrawn legal-status Critical Current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.
  • the known Water heater of the generic type is the Temperature sensor except from the convection heat of the passing exhaust gas also from the radiant heat Adjacent building and wall parts of the exhaust gas hood influenced. That can be undesirable Safety shutdowns result because of the radiant heat the temperature signal from the back-flowing exhaust gas is superimposed and adulterated.
  • the flow control element is the temperature sensor against the Radiation from neighboring parts of the exhaust hood shielded and therefore actually only the temperature of return flowing exhaust gas detected. That allows a finer one Adjustment of the temperature sensor to a lower one Temperature level and leads to compliance even more stringent Security requirements.
  • the Flow guide element is a rigid body that with a Bore for receiving the temperature sensor is provided dimensioned and in the side outlet opening of the Exhaust gas hood is arranged that convection too guaranteed small amounts of exhaust gas around the temperature sensor is.
  • FIG. 1 shows schematically and reduced a partial section through an exhaust gas hood of a gas-heated Water heater and in Figure 2 is a larger scale Part of the safety device of the water heater shown.
  • an exhaust gas hood 10 In an exhaust gas hood 10 are between one Entrance area 12 and a sleeve 14 for chimney connection several flow baffles 16, 18, 20, 22 arranged.
  • the exhaust gas hood 10 has one side Exit opening 24, through which backlog exhaust gas in the Installation room of the water heater can flow.
  • a temperature sensor 26 In the Outlet opening 24, a temperature sensor 26 is installed, which is exposed to the temperature influence of the exhaust gas flows through the outlet opening 24.
  • the temperature sensor 26 is part of a safety device that controls the gas burner of the water heater turns off when the flow through the Exit opening 24 lasts longer than a predetermined time.
  • the temperature sensor 26 is in a bore 28 Flow guide body 30 arranged from there is heat-insulating material and the temperature sensor 26 against the radiation of neighboring building and wall parts of the Exhaust gas hood 10 shields.
  • the bore 28 and the Annulus 32 between temperature sensor 26 and bore wall are dimensioned so that convection is even smaller Exhaust gas quantities are guaranteed through them.
  • the Temperature signal of the exhaust gas flowing back is given by the Radiation from neighboring parts is not affected and falsified, so that unnecessary shutdowns of the Safety device can be avoided.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Prevention Of Fouling (AREA)
  • Ventilation (AREA)
  • Control Of Combustion (AREA)
  • Housings, Intake/Discharge, And Installation Of Fluid Heaters (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

The inlet (10) includes a conduit (12) with a longitudinally extending flow passageway, a portion defining a flow opening for water flow into the passageway and a portion extending from this. Several wall openings are in the wall for water flow from the passageway with a radial component. A deflector extends in the conduit and into a path of the water flow and deflects a portion of the flow outwards through the openings. On installation of the inlet into the tank one end of the conduit extends through the port and the other end into the tank. The wall openings and the deflector coact as the flow is introduced into the tank to reduce generation of temperature gradients within the tank.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem gasbeheizten Wassererhitzer nach der Gattung des Hauptanspruchs. Bei den bekannten Wassererhitzern der gattungsmäßigen Art ist der Temperaturfühler außer von der Konvektionswärme des vorbeistreichenden Abgases auch von der Strahlungswärme benachbarter Bau- und Wandteile der Abgassammelhaube beeinflußt. Das kann zu unerwünschten Sicherheitsabschaltungen führen, weil die Strahlungswärme das Temperatursignal aus rückströmenden Abgas überlagert und verfälscht.The invention is based on a gas-fired water heater according to the genus of the main claim. With the known Water heater of the generic type is the Temperature sensor except from the convection heat of the passing exhaust gas also from the radiant heat Adjacent building and wall parts of the exhaust gas hood influenced. That can be undesirable Safety shutdowns result because of the radiant heat the temperature signal from the back-flowing exhaust gas is superimposed and adulterated.

Vorteile der ErfindungAdvantages of the invention

Durch die erfindungsgemäße Anordnung eines den Temperaturfühler mit Abstand umgebenden Strömungsleitelements wird der Temperaturfühler gegen die Strahlung benachbarter Teile der Abgassammelhaube abgeschirmt und daher tatsächlich nur die Temperatur von rückströmendem Abgas erfaßt. Das erlaubt eine feinere Abstimmung des Temperaturfühlers auf geringerem Temperaturniveau und führt zur Einhaltung auch verschärfter Sicherheitsanforderungen.Due to the arrangement of the invention Temperature sensor with surrounding distance The flow control element is the temperature sensor against the Radiation from neighboring parts of the exhaust hood shielded and therefore actually only the temperature of return flowing exhaust gas detected. That allows a finer one Adjustment of the temperature sensor to a lower one Temperature level and leads to compliance even more stringent Security requirements.

Eine bevorzugte Ausführung ergibt sich, wenn das Strömungsleitelement ein starrer Körper ist, der mit einer Bohrung zur Aufnahme des Temperaturfühlers versehen ist, die so dimensioniert und in der seitlichen Austrittsöffnung der Abgassammelhaube angeordnet ist, daß eine Konvektion auch geringer Abgasmengen um den Temperaturfühler gewährleistet ist.A preferred embodiment results if the Flow guide element is a rigid body that with a Bore for receiving the temperature sensor is provided dimensioned and in the side outlet opening of the Exhaust gas hood is arranged that convection too guaranteed small amounts of exhaust gas around the temperature sensor is.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der folgenden Beschreibung erläutert. Die Figur 1 zeigt schematisch und verkleinert einen Teilschnitt durch eine Abgassammelhaube eines gasbeheizten Wassererhitzers und in Figur 2 ist in größerem Maßstab ein Teil der Sicherheitseinrichtung des Wassererhitzers dargestellt.An embodiment of the invention is in the drawing shown and explained in the following description. The Figure 1 shows schematically and reduced a partial section through an exhaust gas hood of a gas-heated Water heater and in Figure 2 is a larger scale Part of the safety device of the water heater shown.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In einer Abgassammelhaube 10 sind zwischen einem Eingangsbereich 12 und einer Manschette 14 für Kaminanschluß mehrere Strömungsleitbleche 16, 18, 20, 22 angeordnet. Auf einer Seite hat die Abgassammelhaube 10 eine Austrittsöffnung 24, durch welche rückstauendes Abgas in den Aufstellungsraum des Wassererhitzers strömen kann. In die Austrittsöffnung 24 ist ein Temperaturfühler 26 eingebaut, der dem Temperatureinfluß vom Abgas ausgesetzt ist, das durch die Austrittsöffnung 24 strömt. Der Temperaturfühler 26 ist Teil einer Sicherheitseinrichtung, die den Gasbrenner des Wassererhitzers abschaltet, wenn die Strömung durch die Austrittsöffnung 24 länger als eine vorgegebene Zeit anhält. In an exhaust gas hood 10 are between one Entrance area 12 and a sleeve 14 for chimney connection several flow baffles 16, 18, 20, 22 arranged. On The exhaust gas hood 10 has one side Exit opening 24, through which backlog exhaust gas in the Installation room of the water heater can flow. In the Outlet opening 24, a temperature sensor 26 is installed, which is exposed to the temperature influence of the exhaust gas flows through the outlet opening 24. The temperature sensor 26 is part of a safety device that controls the gas burner of the water heater turns off when the flow through the Exit opening 24 lasts longer than a predetermined time.

Der Temperaturfühler 26 ist in einer Bohrung 28 eines Strömungsleitkörpers 30 angeordnet, der aus wärmeisolierendem Material besteht und den Temperaturfühler 26 gegen die Strahlung benachbarter Bau- und Wandteile der Abgassammelhaube 10 abschirmt. Die Bohrung 28 bzw. der Ringraum 32 zwischen Temperaturfühler 26 und Bohrungswand sind so dimensioniert, daß eine Konvektion auch nur kleiner Abgasmengen durch sie hindurch gewährleistet ist. Das Temperatursignal des rückströmenden Abgases wird durch die Strahlung benachbarter Teile nicht beeinflußt und verfälscht, so daß unnötige Abschaltungen der Sicherheitseinrichtung vermieden werden.The temperature sensor 26 is in a bore 28 Flow guide body 30 arranged from there is heat-insulating material and the temperature sensor 26 against the radiation of neighboring building and wall parts of the Exhaust gas hood 10 shields. The bore 28 and the Annulus 32 between temperature sensor 26 and bore wall are dimensioned so that convection is even smaller Exhaust gas quantities are guaranteed through them. The Temperature signal of the exhaust gas flowing back is given by the Radiation from neighboring parts is not affected and falsified, so that unnecessary shutdowns of the Safety device can be avoided.

Claims (2)

Gasbeheizter Wassererhitzer mit einer Abgassammelhaube, die zur Strömungssicherung eine seitliche Austrittsöffnung hat, in welche ein von rückstauendem Abgas umströmter Temperaturfühler einer Sicherheitseinrichtung eingebaut ist, dadurch gekennzeichnet, daß der Temperaturfühler (26) mit Abstand von einem Strömungsleitelement (30) umgeben ist.Gas-heated water heater with an exhaust gas hood, which has a side outlet to ensure flow into which a backflow of exhaust gas flows Temperature sensor of a safety device is installed, characterized in that the temperature sensor (26) with Distance is surrounded by a flow guide element (30). Wassererhitzer nach Anspruch 1, dadurch gekennzeichnet, daß das Strömungsleitelement (30) ein starrer und wärmeisolierender Körper ist, der mit einer Bohrung (28) zur Aufnahme des Temperaturfühlers (26) versehen ist, die so dimensioniert und in der seitlichen Austrittsöffnung (24) der Abgassammelhaube (10) angeordnet ist, daß eine Konvektion auch geringer Abgasmengen um den Temperaturfühler (26) gewährleistet ist.Water heater according to claim 1, characterized in that the flow guide (30) is a rigid and is heat-insulating body with a bore (28) Recording the temperature sensor (26) is provided, so dimensioned and in the side outlet opening (24) the exhaust gas hood (10) is arranged that a Convection of even small amounts of exhaust gas around the temperature sensor (26) is guaranteed.
EP98106557A 1997-05-30 1998-04-09 Gas fired water heater with a flue gas collecting hood Withdrawn EP0881439A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29709431U DE29709431U1 (en) 1997-05-30 1997-05-30 Gas-heated water heater with an exhaust gas hood
DE29709431U 1997-05-30

Publications (2)

Publication Number Publication Date
EP0881439A2 true EP0881439A2 (en) 1998-12-02
EP0881439A3 EP0881439A3 (en) 2000-05-17

Family

ID=8040936

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98106557A Withdrawn EP0881439A3 (en) 1997-05-30 1998-04-09 Gas fired water heater with a flue gas collecting hood

Country Status (2)

Country Link
EP (1) EP0881439A3 (en)
DE (1) DE29709431U1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT503132B1 (en) * 2006-04-10 2007-08-15 Vaillant Austria Gmbh Flow control monitoring method for heater, involves cutting off temperature of heater detected by sensor during operation of heater when temperature falls below certain temperature difference
EP3667198A1 (en) * 2018-12-12 2020-06-17 Bosch Termotecnologia S.A. Water heater with improved surveillance

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6305369B1 (en) * 2000-10-18 2001-10-23 Carrier Corporation Safeguard for furnace draft system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR829532A (en) * 1937-02-25 1938-06-29 Blanc & Cie Development of draft switches
US3537803A (en) * 1969-10-29 1970-11-03 Joseph N Ignazio Safety device for gas-fired furnaces and the like
DE2260517B2 (en) * 1972-12-11 1975-11-06 Wamsler-Herd- Und Ofen Gmbh, 8000 Muenchen Backflow protection for a gas space heater
US4080151A (en) * 1976-01-22 1978-03-21 John Zink Company Furnace pressure sensor
DE3008399A1 (en) * 1980-03-05 1981-09-17 Küppersbusch AG, 4650 Gelsenkirchen Gas heater backwash and unburnt gas protector - consists of N-type semiconductor sensor with porous coating damping response
ATA238591A (en) * 1991-12-02 1995-11-15 Vaillant Gmbh EXHAUST SYSTEM

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT503132B1 (en) * 2006-04-10 2007-08-15 Vaillant Austria Gmbh Flow control monitoring method for heater, involves cutting off temperature of heater detected by sensor during operation of heater when temperature falls below certain temperature difference
EP1845318A2 (en) * 2006-04-10 2007-10-17 Vaillant GmbH Method for monitoring a flow safety device
EP3667198A1 (en) * 2018-12-12 2020-06-17 Bosch Termotecnologia S.A. Water heater with improved surveillance

Also Published As

Publication number Publication date
EP0881439A3 (en) 2000-05-17
DE29709431U1 (en) 1998-10-22

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