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
  • F24H9/18—Arrangement or mounting of grates or heating means
  • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
  • F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
  • F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
  • F23M20/00—Details of combustion chambers, not otherwise provided for, e.g. means for storing heat from flames

Definitions

• the invention relates to a heat storage ' device for an oil or gas furnace.
• Ordinary household oil or gas furnaces normally operate as start/stop furnaces with dead periods. During the periods when the furnace • is operating, the heat emitted from the " burner will ac- * - cumulate in the walls of the boiler and in the amount of water in the boiler. When the amount of heat accu ⁇ mulated during the dead periods of the furnace is distributed in the heating plant or has disappeared as losses e.g. due to natural draught from the chim ⁇ ney, the boiler thermostat of the furnace will start the furnace so as to produce more heat.
• the heat storage device ac ⁇ cording to the present invention is adapted to be placed directly in the combustion chamber of the furnace so that it touches the flame, and the device is designed as a solid metal block. It is thus pos ⁇ sible to ' use the heat storage device very efficiently since it takes up heat directly from the heat source,
• OMPI ie. the furnace flame, so that the storage device reaches a high temperature and thus a large heat content.
• the device is designed as a body of revolution as disclosed in claim 3. It is thereby possible for the flame to circumvent the device and therefore the device will not impede the flow in the boiler cham ⁇ ber. On the contrary there is obtained an improved heat emission effect to the boiler wall as the flame is forced closer towards the boiler wall.
• the heat storage device In a simple manner in the combustion chamber of a boiler, it can be designed with a support base as disclosed in claim 4.
• the support base moreover forms part of the heat storage device and the strong base means that the device will stand securely and firmly in the furnace.
• the support fcase of the device can. be designed as dis ⁇ closed in claim 7, whereby the device shaped as a body of revolution can be positioned so as to incline slightly rearwardly away from the flame. Improved flow conditions in the combustion chamber are there ⁇ by obtained.
• Fig. 1 is a cross-section of a heat storage device according to the invention made of cast iron and having an inclining support base
• Fig. 2 is a cross-section of. a heat storage device according to the invention made of cast iron having an inclining support base and a lifting device on the up ⁇ turned part
• Fig. 3 is a cross-section of a heat storage device according to the invention being substantially egg-shaped and having support legs and a lifting hook welded thereon.
• Fig. 1 of the drawings shows a heat storage device 4 off cast iron weighing about 12 kg.
• the device is pro ⁇ vided with a base 5 moulded at the same time as the device and forming an integral part, thereof.
• Fig. 2 shows a similar device but provided with a carrying or lifting device 1 at the top so that it is easier
• the device shown in Fig. 2 weighs from about 12 kg to about 20 kg.
• Fig. 3 shows a somewhat different embodiment of the invention, the device having the shape of a flattened ball or an egg.
• the device is provided with three support legs 3 and an eye 2 welded thereon, by which eye 2 ' it is possible to lift the device.
• This embodi ⁇ ment weighs about 23 kg and has a maximum diameter of about 18 cm and a minimum diameter of about i ⁇ cm.
• the heat storage device is placed directly in the combustion chamber of the boiler so that the device stands at a distance of 5-15 cm from the burner head.
• the device has the shape of a body of revolution, eg. ball-shaped, flattened ball-shaped, egg-shaped or a similar shape so that the flame substantially circumvents the device.
• the device reaches a temperature of 150-350°C in an ordinary household furnace and this means that the dead period of the furnace is substantially doubled on account of the thermal energy accumulated in the device.
• the flame is direct ⁇ ed closer to the boiler wall and can therefore in an improved an more efficient manner emit its heat to the boiler.
• the device preferably has a round shape.
• many boilers are provided with rather small doors so that it is difficult to place eg. a cylindrical device in the combustion chamber.
• a ball has the greatest mass in relation to surface compared with other shapes so that more even heat emission from the device is obtained ' during the * dead periods.
• a round shape gives a favour- ' able flow pattern so that the flame can circumvent the device and not flash back towards the burner.
• the device can have support legs or a base which can suitably be designed so that the device inclines some ⁇ what rearwardly away from the burner for further im- proving flow conditions.
• the heat storage device operates most effectively during the weak heating seasons, ie. spring, summer and autumn, when a doubling of the dead period of the furnace can be obtained by using a device accord ⁇ ing to the invention.
• ordinary oil or gas furnaces do not normally operate very effeciently because the boiler is in fact over- dimensioned at these times of year.
• the device according to the invention there is obtained a substantial improvement in efficiency since the combustion chamber is not nearly cooled to so low temperatures due to the heat accumulated in the de- . vice.
• the heating season proper ie. in winter, there is also obtained a certain improvement in effeciency but not to the same extent as is experi ⁇ enced during the weak heating seasons.
• the device is made of metal, preferably of cast iron, which does not form oxide scale when heated to 150- 350°C.
• the metals forming oxide scale are not par ⁇ ticularly applicable since the oxide scale works as an insulating layer on the device. * Other metals not forming oxide scale and which can stand the tempera- tures of an oil or gas flame in a boiler can also be used .

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Solid-Fuel Combustion (AREA)
• Combustion Of Fluid Fuel (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8089578

Family Applications (1)

Country Status (4)

Citations (12)

• 1982
  • 1982-01-12 DK DK8682A patent/DK8682A/da not_active Application Discontinuation
  • 1982-07-08 SE SE8204216A patent/SE8204216L/xx not_active Application Discontinuation
• 1983
  • 1983-01-06 WO PCT/DK1983/000002 patent/WO1983002494A1/en unknown
  • 1983-01-06 EP EP83900335A patent/EP0098848A1/en not_active Withdrawn

Patent Citations (12)

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