Electric resistance heating devices – Heating devices – Combined with nonelectric heating means
Patent
1993-06-17
1994-12-27
Bartis, Anthony
Electric resistance heating devices
Heating devices
Combined with nonelectric heating means
219523, 219536, 392343, 392344, 392349, F24C 102, F24C 706, F24H 918, H05B 300
Patent
active
053772970
DESCRIPTION:
BRIEF SUMMARY
The object of the invention is a method of combining electrical heating with a wood-heated masonry furnace, particularly with a soapstone stove, which comprises an outer jacket and at least one fire chest arranged therewithin for burning the wood, and cheek conduits between the outer surface of the fire chest and the inner surface of the outer jacket, the conduits being connected to the fire chest at one end and to a flue at the opposite end; according to which method at least one electric resistor element is installed inside the furnace.
It is previously known to combine electrical heating with a wood-heated furnace. For example, Finnish Patent 62,922 discloses installation of resistors into smoke canals of a factory-made stove through the bottom of the stove. However, such installation is suited only for factory-made furnaces with a bottom that is not in contact with the ground. Thus, this kind of installation is impossible e.g. in connection with a masonry furnace.
On the other hand, Finnish Patent Application 882,580 discloses walling of resistor elements into the stone wall of the furnace between the surface and double rocks (in other words, to a place that is not necessarily covered with a fire cover). Since installation of resistor elements in this case requires a pre-made groove on the inner surface of the surface rock or the outer surface of the double rock, this kind of installation cannot be provided in an already installed masonry furnace, either.
The object of the present invention is to provide a method by which any existing wood-heated masonry furnace can be easily provided with electrical heating afterwards. According to the invention this is effected by drilling holes in the fire cover of the furnace and by arranging said at least one resistor element to hang from the fire cover in the air space inside the furnace. The air space in this connection means an empty space inherent inside the furnace in which the resistor is surrounded by air. In practice the air space is usually a cheek conduit of the furnace but it can also be an insulating space inside the furnace with empty space for resistor elements.
On account of the solution according to the invention the resistors can also be cleaned or changed easily. Also, in comparison with e.g. the solution presented in Finnish Patent Application 882,580, cheaper resistor elements can be used in the method according to the invention since the resistor elements are in an open space in which the temperature cannot rise as high as in the "closed" space between the surface and double rocks .
In the following the invention will be described in greater detail with reference to the examples according to the attached drawing, in which
FIG. 1 is a transverse cross-sectional view of a masonry combination of a stove and a baking oven,
FIG. 2 shows in greater detail installation of resistor elements in the furnace of FIG. 1, and
FIG. 3 shows installation of resistor elements in another kind of masonry furnace.
FIG. 1 shows a combination of a baking oven and a stove comprising an outer jacket 1 made of stone material, such as soapstone, comprising a stove 2 and a baking oven 3 thereabove. An ash chest 4 is provided below the stove 2 in the known manner. A fire chest 5 of the stove and a fire chest 6 of the baking oven are combined by conduits (not shown) at the rear portion of the furnace to a secondary combustion chamber 7 in order to conduct combustion and flue gases generated in the fire chests to the secondary combustion chamber. Cheek conduits 8 extend downward from the secondary combustion chamber 7 on both sides on the fire chests 5 and 6, leading to the flue 9 of the combination of a baking oven and a stove. The secondary combustion chamber and the upper portion of the cheek conduits are closed with a fire cover 10, i.e. the cover that covers the conduits of the furnace in which the flue gases move. Above the fire cover 10 there is an upper cover 11 of the stove, and between the upper cover and the fire cover there is mineral wool insulating material 12
REFERENCES:
patent: 1495685 (1924-05-01), Graf
patent: 1545079 (1925-07-01), Barlow
patent: 4253444 (1981-03-01), Johnson
patent: 4263470 (1981-04-01), Sjoberg
Bartis Anthony
Suomen Vuolukivi Oy
LandOfFree
Method of modifying masonry furnace by inserting electric heatin does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of modifying masonry furnace by inserting electric heatin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of modifying masonry furnace by inserting electric heatin will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-924859