EP0859204A2 - Appareil de chauffage pour chauffe-eau - Google Patents

Appareil de chauffage pour chauffe-eau Download PDF

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Publication number
EP0859204A2
EP0859204A2 EP97121507A EP97121507A EP0859204A2 EP 0859204 A2 EP0859204 A2 EP 0859204A2 EP 97121507 A EP97121507 A EP 97121507A EP 97121507 A EP97121507 A EP 97121507A EP 0859204 A2 EP0859204 A2 EP 0859204A2
Authority
EP
European Patent Office
Prior art keywords
shaft
combustion
air
cooling
heater according
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
EP97121507A
Other languages
German (de)
English (en)
Other versions
EP0859204A3 (fr
Inventor
Ulrich Besser
Michael Plothe
Marcus Bienzle
Manfred Hosch
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
Priority claimed from DE19720633A external-priority patent/DE19720633A1/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0859204A2 publication Critical patent/EP0859204A2/fr
Publication of EP0859204A3 publication Critical patent/EP0859204A3/fr
Ceased 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
    • F24H9/0084—Combustion air preheating
    • F24H9/0089—Combustion air preheating by double wall boiler mantle
    • 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
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/0027—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters using fluid fuel

Definitions

  • the invention relates to a gas heater according to the Genus of the main claim.
  • heaters of this Genus is the combustion shaft through a water flow cooled, bringing the water efficiency down to a value of approx. 1% below the firing efficiency is raised.
  • the burner, the combustion shaft and the Heat exchanger in a box closed to the environment to arrange, through which the combustion air is sucked becomes. With this arrangement, seals must be between Burner, combustion shaft and heat exchanger provided that are resistant to high temperatures and exhaust gases.
  • the arrangement according to the invention with the characteristic Features of the main claim has the advantage that at Heaters with a premix burner without additional Arrangement of a fan for the cooling air delivery and also otherwise roughly the same with simple means Cooling effect and improvement of water efficiency like for heaters with water cooling of the combustion shaft is achievable.
  • a simple and space-saving arrangement results when the fan is arranged upstream of the premix burner and in a duct, in which a pre-mixing chamber and at least one cooling air duct is formed next to it.
  • the premixing chamber can advantageously be located centrally in the Air duct arranged and the cooling air duct as a die Annular space surrounding the premixing chamber, wherein preferably an annular wall surrounding the premixing chamber to the fan-side inlet opening of the air shaft is introduced.
  • the assembly of the heater is easier if the Air duct on the inlet side with the outlet of the Blower and the output side with a Combustion shaft with cooling shaft surrounding it is designed to be connectable.
  • the air shaft can at least flow resistance part of its length towards the cooling shaft be expanded.
  • the flow resistances in the device are coordinated that the pressure of the cooling air in a cooling shaft surrounding the combustion shaft higher than the pressure in the combustion chamber exhaust gas path, can pass to the Means and measures for sealing the circumferential gap between the premix burner and the combustion shaft and less between this and the heat exchanger Requirements are made, such as at Heaters with external wall connection, in which the Combustion shaft from the intake of combustion air is flowing around. If necessary, seals can also be attached these positions are completely eliminated.
  • the closed design of the combustion chamber exhaust gas path also allows the combustion chamber with the Combustion shaft surrounding annular space through openings connect, whose cross section depending on the Exhaust gas temperature is controlled.
  • This conception is done an air admixture in the combustion chamber upstream of the Heat exchanger, which is a decrease in Heat exchanger performance and thus an increase in Exhaust gas enthalpy causes values at which a Condensation in the exhaust gas routing is avoided.
  • the closed version of the combustion chamber exhaust gas path in Heaters with a premix burner and the thereby forced convection by the heat exchanger also has also the further advantage that the pressure loss in Heat exchangers no longer determine the design (Combustion chamber height) for the heater.
  • the cooling air duct for such heaters with chimney or Outer wall connection can also be designed so that the Target airflow already when sucking in Combustion shaft is guided along. With that, in advantageously cooled and the combustion shaft preheated the combustion air at the same time.
  • Figures 1a and 1b show two Embodiments of a heater for fireplace connection and Figure 2 as a third embodiment of a heater for External wall connection.
  • the heater of Figure 1 has a blower 10 which Combustion air via an air duct 12 to one plate-shaped premix burner 14 promotes. over this is a composite of ceramic wall parts Combustion shaft 16 arranged, the combustion chamber 18th encloses and on the output side by a heat exchanger 20 for the water to be heated is complete. About this an exhaust hood 22 is arranged as a flow safety device, which can be connected to a chimney via an exhaust pipe 24.
  • the combustion shaft 16 is through an air flow cooled by the fan 10 together with the Combustion air is promoted.
  • the separation of the two Air flows in the duct 12, which is used for this purpose is provided with an inner ring wall 26, the one Central premixing chamber 28 divides from a cooling air duct 30. This leads into an annular space 32 which is between the Combustion shaft 16 and a cooling shaft 34 are formed, and is covered on the output side by the exhaust hood 22.
  • the premixing chamber 28 itself is separated by partition walls 36 in Individual areas 28a divided, which the fuel gas via Line 40 and is fed via nozzles 42.
  • the annular wall 26 and the intermediate walls 36 go from the fan-side inlet opening of the air shaft 12, from there on down to the diameter of the Cooling shaft 34 expanded. Between the corresponding ones expanding ring wall 26 and the premix burner 14 is a Sealing ring 44 clamped.
  • the combustion shaft 16 can together with the premix burner 14 and heat exchanger 20 with the Cooling shaft 34 form a structural unit 46, which as a whole the air shaft 12 can be placed and connected to it.
  • the flow resistances in the device are thus one on the other matched that the pressure of the cooling air in the annular space 32 is higher is the pressure in the combustion chamber exhaust path. Therefore can high quality seals in the hot area, i.e. to the Contact surfaces between premix burner 14, Combustion shaft 16 and heat exchanger 20 are eliminated.
  • in the Combustion shaft 16 has a plurality of openings 48, which guide the combustion chamber 18 with the cooling air Connect annular space 32 and an air admixture in the Allow combustion chamber 18 in front of the heat exchanger 20. Of the Cross section of the openings 48 is through not shown Means controlled depending on the exhaust gas temperature. The Air admixture causes a decrease in Heat exchanger performance and thus an increase in Exhaust gas enthalpy, which causes condensation in the exhaust system is avoided.
  • the air shaft 12, the premix burner 14, the Combustion shaft 16, the heat exchanger 20 and the Cooling shaft 34 are designed so that they are largely identical modules for both fireplaces and suitable for external wall units. Differentiate between the two types of device then only through the device for removing the Exhaust gas, in the present case as flow protection is trained.
  • the second embodiment of a heater for one Chimney connection is shown in Figure 1b.
  • the fan 10 promotes a Airflow that cools the combustion shaft 16 and is promoted together with the combustion air.
  • Cooling shaft 34 and the annular space 32 thereby formed open at the level of the heat exchanger 20, d. H. not connected to the exhaust hood 22, so that already when the air flow is sucked in by the fan 10 via the air shaft 12b at the combustion shaft 16 is forcibly guided along.
  • the Combustion shaft 16 cooled, on the other hand, the Combustion air preheated so that the associated higher combustion temperatures the efficiency of the Improve heat transfer.
  • the third embodiment of a heater according to the figure 2 has between a blower 50 and a device 52 for the outer wall connection the same modular structure as that 1a, namely an air shaft 12 and an associated cooling shaft 34, which if necessary with the premix burner 14, the combustion shaft 16 and the heat exchanger 20 can be combined to form a structural unit 46 can.
  • the device 52 has an exhaust pipe 54, the flared entrance area 56 over the Heat exchanger 20 extends.
  • the exhaust pipe 54 is concentrically surrounded by a second tube 58 which with the Exhaust pipe 54 encloses an annular space 60 and itself extends on the input side over the cooling shaft 34.
  • the device 52 has a fresh air box 62 with an annular space 64 in a third tube 66 the outside air and via a line 68 to the suction side of the Blower 50 is connected. Due to the heated cooling air in the Annulus 60, the fresh air drawn in is preheated and this increases the efficiency of the heater.
  • fan-assisted combustion air supply can also by replaced an atmospheric premix burner be, in which the combustion air over a in Injectors of the gas burner injected entrained gas flow becomes. Such designs then save the blower for the combustion air supply.

Landscapes

  • 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)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Gas Burners (AREA)
EP97121507A 1997-02-14 1997-12-06 Appareil de chauffage pour chauffe-eau Ceased EP0859204A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19705596 1997-02-14
DE19705596 1997-02-14
DE19720633 1997-05-16
DE19720633A DE19720633A1 (de) 1997-02-14 1997-05-16 Gas-Heizgerät für Wassererhitzer

Publications (2)

Publication Number Publication Date
EP0859204A2 true EP0859204A2 (fr) 1998-08-19
EP0859204A3 EP0859204A3 (fr) 1999-12-15

Family

ID=26033919

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97121507A Ceased EP0859204A3 (fr) 1997-02-14 1997-12-06 Appareil de chauffage pour chauffe-eau

Country Status (1)

Country Link
EP (1) EP0859204A3 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106091344A (zh) * 2016-06-04 2016-11-09 张岩 燃烧换热器的燃烧加热方法及其燃烧换热器
WO2019064957A1 (fr) * 2017-09-26 2019-04-04 株式会社ノーリツ Dispositif d'eau chaude
JP2019060521A (ja) * 2017-09-26 2019-04-18 株式会社ノーリツ 温水装置
CN112747471A (zh) * 2019-10-31 2021-05-04 芜湖美的厨卫电器制造有限公司 燃烧室和燃气设备
US12442531B2 (en) 2019-10-31 2025-10-14 Wuhu Midea Kitchen And Bath Appliances Mfg. Co., Ltd. Combustion chamber and gas apparatus

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7906458A (nl) * 1979-08-28 1981-03-03 Nefit Nv Verwarmingsketel.
NL8304041A (nl) * 1983-11-24 1985-06-17 Remeha Fabrieken Bv Verwarmingsketel met verticale branderbuis.
NL8403236A (nl) * 1984-10-24 1986-05-16 Henk Durieux Verwarmingsketel voor een centrale verwarmingsinstallatie.
GB8812251D0 (en) * 1988-05-24 1988-06-29 Stelrad Group Ltd Bottles

Non-Patent Citations (1)

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

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106091344A (zh) * 2016-06-04 2016-11-09 张岩 燃烧换热器的燃烧加热方法及其燃烧换热器
WO2019064957A1 (fr) * 2017-09-26 2019-04-04 株式会社ノーリツ Dispositif d'eau chaude
JP2019060521A (ja) * 2017-09-26 2019-04-18 株式会社ノーリツ 温水装置
CN111094865A (zh) * 2017-09-26 2020-05-01 株式会社能率 热水装置
US11512871B2 (en) * 2017-09-26 2022-11-29 Noritz Corporation Water heater
CN112747471A (zh) * 2019-10-31 2021-05-04 芜湖美的厨卫电器制造有限公司 燃烧室和燃气设备
US12442531B2 (en) 2019-10-31 2025-10-14 Wuhu Midea Kitchen And Bath Appliances Mfg. Co., Ltd. Combustion chamber and gas apparatus

Also Published As

Publication number Publication date
EP0859204A3 (fr) 1999-12-15

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