Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
  • F23C3/00—Combustion apparatus characterised by the shape of the combustion chamber
• • 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

Definitions

• the present invention relates to such combustion chambers as are disclosed in the preamble to the following claim 1.
• a combustion chamber of the kind in question is disclosed / e.g. in the U.S. patent 3 853 453.
• the partition wall will be in the shape of a cross.
• the ends of the cross are free in the side chambers, while the side edges of the cross are attached to the inside of the combustion chamber.
• the combustion chamber and the partition wall are usually cast in one piece, but it is also possible to manufacture the partition wall as a separate part and weld it in the combustion chamber.
• the combustion chamber is intended to dissipate heat to the surroundings for heating. In most cases, known combustion chambers of the kind in question are surrounded by water in a hot water installation, e.g. hot water for a dwelling house. If cracks occur in the wall of the combustion chamber, the result can be that water comes into the combustion chamber and causes operational disturbances and stoppages.
• the object of the present invention is to eliminate this risk.
• the invention is based on the knowledge that cracks in the combustion chamber wall must . be prevented, while it is possible to allow cracks of a certain width in the partition wall without this the function of the apparatus.
• the problem is solved in accordance with the invention such that in the manufacture of the partition wall, said wall is already provided with stress concentration locations or indications of fracture at predetermined places for providing desired cracks in the partition wall when said wall and the walls of the side chambers are subjected to heat stresses during the first runs as well as heatings during starting and coolings during stopping the apparatus.
• the partition wall thus cracks into two parts in each side chamber, so that these parts can move freely relative each other during heating and cooling. The cracks which occur will, however, be so narrow that they do not affect the course of combustion.
• Fig. 1 is a side view of the combustion chamber in accordance with the invention.
• Fig. 2 is a view from above.
• Fig. 3 is a section along the line 3-3 in Fig. 1
• Fig. 4 is a section along the line 4-4 in Fig. 2
• Fig. 5 is a section along the line 5-5 in Fig. 2.
• the whole combustion chamber is integrally cast steel, and consists of identically similar side chambers 10,12,14,16 which are uniformly distributed around the central axis of the combustion chamber.
• the side chamber 12 for example, has two opposing side walls 12a,12b and an arcuate outer wall 12c so that the side chambers will be substantially half- cylindrical.
• the side walls of the side chambers merge into each other and form corners 18 in the central space of the combustion chamber, to which the side chambers are connected.
• the outer walls of the side chambers run together in an upper end wall 20 and in a lower end wall 22.
• An inlet port 24 is made in the end wall 20 for accommodating an axial inlet pipe (not shown) .
• the end wall 22 is formed with an axial outlet 26, to which an exhaust pipe is to be connected.
• the central zone of the combustion chamber is /'i ⁇ K .
• the partition wall 28 is extended with side portions 28a at the side chambers, said portions extending as projections into the respective side chamber and are terminated with an end edge 28b situated at a predetermined distance from the outer wall of the respective side chamber, e.g. the outer wall 12c of the side chamber 12.
• an end edge 28b situated at a predetermined distance from the outer wall of the respective side chamber, e.g. the outer wall 12c of the side chamber 12.
• the part of the combustion chamber including the side walls, lying above the partition wall form a first chamber 32 in which the fuel-air mixture is ignited and combusted, where ⁇ after the combustion gases flow, with a certain amount of terminating combustion, down through the openings 30 to the subsequent second chamber 34 situated under the partition wall.
• the illustrated combustion chamber is usually intended to be kept immersed in a container with water which is to be heated. Since the partition wall 28,28a is cast in one piece with the rest of the combustion chamber, the edge portions of the partition wall will be rigidly attached to the walls of the combustion chamber and to the side walls of the side chambers. This signifies, inter alia, that considerable heat stresses can be obtained at the side edges 28c of the wall portions
• each wall portion has a stress concentration location at its middle in the form of grooves 36,38,40,42 on the upper side of the partition wall.
• the stress concentration locations illustrated in the example extend out to the respective end edge 28b and meet at the centre 44 of the partition wall.
• the stress concentration locations are formed as V-shaped grooves, the depth of which is substantially greater than the thickness of the partition wall at the stress concentration. In the example illustrated, the depth of the groove is about 85% of the thickness of the partition wall at the stress concentration.
• the side portions have a thickness increasing from the middle and out towards the side edges, where the wall portions connect via a softly rounded junction to the side walls of the side chamber.
• the stress concentrations can naturally have a plurality of other locations than those illustrated in conjunction with the described embodiment.

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)
• Cylinder Crankcases Of Internal Combustion Engines (AREA)
• Combustion Of Fluid Fuel (AREA)
• Combustion Methods Of Internal-Combustion Engines (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20338624

Family Applications (1)

Country Status (6)

Cited By (2)

Families Citing this family (2)

Family Cites Families (2)

• 1979
  • 1979-08-14 SE SE7906798A patent/SE418221B/sv not_active IP Right Cessation
• 1980
  • 1980-08-13 WO PCT/SE1980/000206 patent/WO1981000610A1/en unknown
  • 1980-08-13 FI FI802548A patent/FI802548A/fi not_active Application Discontinuation
  • 1980-08-14 BE BE0/201764A patent/BE884793A/fr not_active IP Right Cessation
  • 1980-08-14 IT IT24187/80A patent/IT1132415B/it active
• 1981
  • 1981-03-09 EP EP80901581A patent/EP0034601A1/en not_active Withdrawn

Non-Patent Citations (1)

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