FI72265B - BASTUUGN. - Google Patents

Description

1 72265

Saunankiuas - Bastuugn.

Wood-heated so-called continuously heated sauna heaters are usually designed in such a way that the stove stones are stacked on top of the closed upper wall of the firebox. In this case, the steam water often gets to run on the metal surface supporting the stove stones, where it evaporates under the influence of the hot metal surface.

It has been found that water evaporating from a metal surface produces positive ions which have a fatigue effect on the bath. The thermal efficiency of known continuously heated sauna heaters is also poor, unless they have been improved by complex arrangements for conducting flue gas ducts in the heater casing. However, such complex and expensive heaters are not common in the market.

The invention relates to a sauna heater comprising a firebox, a flue gas duct for conducting flue gases from a firebox to a chimney and a heater space with a heater, the furnace and / or flue gas duct being covered at least on its upper side by one or more tiled prevents steam water from entering hot metal surfaces.

Sauna heaters of this type are known, for example, from patent publications FI-45724, FI-52807, DE-835638 and DK-57313.

It is characteristic of these known stove structures that the firebox is directly bounded by the lower surface of the cover stone slab and the hot flue gases leave the flue before they have time to properly transfer their heat content to the stone slab. Such a stove heats not only the stove stone, but also the chimneys unreasonably.

Another disadvantage is that the surface temperature of the stove slab adjoining the firebox rises so high that the radiant heat to be dried and "grilled" becomes uncomfortably high.

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The object of the invention is to further develop such a sauna heater so that while ensuring a good heat efficiency ratio and rapid heating of the sauna, the surface temperature of the heater and the proportion of radiant heat can be kept small enough to provide a pleasant steam.

To achieve this purpose, a sauna stove according to the invention is characterized in that the flue gas duct is arranged to rotate horizontally along the underside of the stove slab or inside the stove slab, said partition formed by a metal plate or stone wall between said flue gas duct and the firebox.

Thanks to this flue gas recirculation, the flue gases escape colder than before into the flue gas flue, which means that more of the heat of combustion is kept inside the sauna. In particular, the temperature in the firebox increases relative to the surface temperature of the stone slab, making combustion in the firebox more efficient, while the surface temperature of the stone slab does not rise so high that the radiant heat becomes uncomfortably high. In practice, this means that the heater according to the invention achieves the same heat and steam output as well as a more pleasant steam with a smaller amount of wood than before.

In the following, two embodiments of the invention will be described with reference to the accompanying drawings, in which Fig. 1 shows a sauna heater according to a first embodiment of the invention in a schematic vertical section and Fig. 2 shows a top view of the heater according to Fig. 1 without a stone.

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Fig. 3 shows a sauna heater according to a second embodiment of the invention in a schematic vertical section and Fig. 4 shows a top view of the heater according to Fig. 3.

Fig. 5 shows a sauna heater according to a third embodiment of the invention in a schematic vertical section and Fig. 6 shows a sauna heater according to a fourth embodiment of the invention in a schematic vertical section.

The stove may be provided with a separate outer jacket, not shown in the drawings, which may consist of a sheet metal shell or may be made in place by bricklaying.

A furnace 1 is placed inside the outer jacket. In the embodiment of Figures 1 and 2, the upper wall 2 of the furnace 1 has a hole 11 for conducting flue gases into the flue gas duct 8. that they have to circulate as illustrated by the arrows 10 before the flue gases enter the flue through the outlet connection 9. The cup-shaped vessel 4 is closed from above by a uniform stove stone slab 7, the stone surface of which forms the wall surface delimiting the flue gas duct 8. In the central area, the stone slab 7 rests on the guide 6.

Between the bottom surface 5 of the vessel 4 and the upper wall 2 of the firebox 1 there is an annular space 3 opening into the environment, both wall surfaces 2 and 5 of which effectively transfer heat to the sauna space in the annular space 3 with the air. In this way, the sauna is quickly heated up and the slab-like stove stone 7 is also quickly hot enough for steaming.

The stove tile 7 can be made of soapstone, slate or granite.

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The embodiment of Figures 3 and 4 differs from the previous one only in that the stove stone slab 7 has been replaced by several slab-like stove stones 7 ', which are stacked in such a way that the flue gas duct is also partially formed between the stove stone slabs. The cup-shaped vessel 4 'and the firebox 1 are made round when viewed from above, whereby the cup-shaped vessel 4' and the upper wall 2 of the firebox 1 can be made of steel plate by pressing in the same way as the ends of the tanks are made.

In the embodiment of Figure 5, a grate 12 is drawn in the lower part of the furnace 1, below which there is a space 13 for an ash box. The stone slab 7 has a hole in the middle or at the rear edge, to which a pipe 9 is connected for conducting flue gases into the flue. Below the hole is attached to the wall of the firebox 1 or by hanging on the stone slab 7 a fire guide plate 14 spaced from the stone slab 7 parallel to it.

The embodiment of Fig. 6 differs from Fig. 5 in that the flue ducts 8 'are drilled in a thick stone slab 7 ". there may be one or more, and the flue gas discharge point may also be selected from different points in the stone slab according to practical need and experimentation.

If it is desired to arrange the heating of the washing water in connection with the heater, for example in summer cottage use, a water pipe on the firebox side can be used to support and support the stone slab or slabs. In detached houses, the water pipe can be connected to a hot water tank, in which case a circulating water pump must be used in the pressurized system.

On top of the stone slab 7, 7 ', 7 ", smaller loose stones can be used to prevent water splashing and to enhance the formation of steam with a larger surface area.

Claims (6)

A sauna heater comprising a firebox (1), a flue gas duct (8) for conducting flue gases from a firebox to a chimney and a heater space with a heater (7), the furnace (1) and / or flue gas duct (8, 8 ') being covered at least on its upper side by one or more a tiled stove stone (7, 7 ', 7 "), the stone surface of which forms a wall surface delimiting the firebox (1) and / or the flue gas duct (8, 8') which prevents steam water from entering the hot metal surfaces, characterized in that the flue gas duct (8, 8 ') is arranged to rotate horizontally along the underside of the stove slab (7; 7 ') or inside the stove slab (7 "), said horizontal flue gas duct (8, 8') and the firebox (1) having a metal plate (2, 5; 14 or a stone wall). (Fig. 6). Sauna heater according to Claim 1, characterized in that a ring space (3) opens into the environment between the upper wall (2) of the firebox (1) and the lower surface (5) of the flue gas duct (8). Sauna heater according to Claim 2, characterized in that the firebox (1) has a cup-shaped vessel (4, 4 ') / with a hole (11) opening in the firebox (1) at the bottom and the upper side of which is covered with one (7) or more (7 ') stove stone slabs and that said annular space (3) is formed between the bottom (5) of the cup-shaped vessel (4) and the upper wall (2) of the firebox (1) around said hole (11). Sauna heater according to Claim 1, characterized in that the flue gas ducts (8 ') are drilled in a thick stone slab (7 "). Sauna heater according to Claim 1, characterized in that the stone slab is supported on a water pipe on the side of the firebox (1). 6,72265 5,72265 Sauna heater according to Claim 1, characterized in that a fire guide plate (14) parallel to it is attached to the wall or stone slab (7) of the firebox (1) at a distance from the stone slab (7), at which point the stone slab (7) has a hole. for the flue gas duct. Il 7 72265