FI63111C - LEAF FOER UPPVAERMNINGSUGN SAOSOM OEPPEN SPIS ELLER LINANDE - Google Patents

Description

1 63111

The present invention relates to a metal housing for a heating furnace, such as a fireplace or similar heating core, formed by at least one wall of a furnace hearth 5, the upper surface of which forms a furnace smoke shelf and has a bottom tapering downwards and a flat top , a lower part resting on a grate or the like, wherein the housing further comprises room air inlet and outlet openings and air control means fixed to the side and / or rear walls of the housing.

Heat exchangers mounted on the rear wall or rear corner of a firebox of brick open fireplaces are already known. These are made by attaching metal plates at a distance from the rear wall or walls of the furnace, the edges of which are sealed against the walls of the furnace, leaving a space between these walls and the metal plates which is connected to the room air at the lower and upper air inlets and outlets. through devices. When there is a fire in the fireplace, the air in the intermediate space is heated by metal plates. The room air then begins to circulate through the intermediate space, which decisively accelerates the heating of the room.

Known heat exchangers of this type have a diameter of 25 mm. the serious drawback is that because the thermal expansion of metal differs from the thermal expansion of bricks, it is very difficult to keep the joints between the metal plate and the walls of the furnace tight. When poorly installed and sealed, such heat exchangers may thus pose a carbon monoxide hazard when flue gases are allowed to mix with the heated room air.

On the other hand, it is common knowledge that an orthodox fireplace must have a so-called smoke shelf to make the fireplace as good as possible.

35 Such a smoke shelf is generally obtained by making a protrusion of refractory bricks on the rear wall of the firebox, the upper surface of which is approximately horizontal and whose lower surface 2 63111 protrudes obliquely downwards and backwards, so that the cross-section of the furnace decreases upwards to the smoke shelf. This shape is crucial for combustion.

However, forming a smoke shelf for a fireplace is a hi-5 das, cumbersome and expensive procedure. Namely, a lot of bricks have to be blocked and the supporting structures to be demolished have to be built during the drying of the masonry. If the smoke shelf is made of refractory mass, a mold is required for this, which must be supported during drying. In addition, it should be noted that the shape, dimensions and position of the smoke shelf in relation to the furnace opening require good professional skills and knowledge, i.e. few furnace masons.

These drawbacks are avoided in the heating core of the heating furnace according to Swiss patent publication 335 557, which has a housing made of metal, the upper surface of which forms the smoke shelf of the furnace. Because the heat core is a metal housing, it has no joints between the metal and the brick, the sealing of which could deteriorate over time. Furthermore, since the housing is designed to also form a furnace smoke shelf, this does not need to be masonry and the heat transfer is considerably more efficient than in previously known similar devices because both the radiant heat of the flames and the flue gas heat are transferred to the room air through the housing front wall.

In the solution according to said patent, the heated room air in the heating core is directed upwards in a zig-zag form, as a result of which the air only contacts the heating plate of the heating core in places, whereby the heat transfer from the fire housing to the room air is deficient.

It is an object of the present invention to provide a thermal core with better heat transfer than the thermal core according to Swiss Patent 335,557. The heat core according to the invention is characterized in that the interior of the upper part of the housing has an air guide plate which is approximately 35 parallel to the front surface of the upper part. By means of such an air baffle, the room air rising inside the housing can be controlled 3 63111 so that it flows along the entire length of the front side of the housing, i.e. the firebox, which promotes the heating of the air.

The heating core according to the invention will now be described in more detail with reference to the accompanying drawing, in which Fig. 1 shows a heating core placed in a storage furnace in vertical section along line A-A in Fig. 3, Fig. 2 shows vertical section along line B-B in Fig. 1, and

Fig. 3 shows a section on the line C-C in Fig. 2

along.

The furnace shown in the drawing has a firebox 1, which in the illustrated case is bounded by side walls 2, a grate 3 and a front wall 4 clad in refractory bricks, and a firebox opening 5 which can be provided with an orifice.

The rear side of the firebox is formed by a heat core 6 according to the invention, which has a dense metal housing structure with a ribbed fire plate 8 facing the furnace, an approximately horizontal smoke shelf 9 connected to its upper edge 9, side and bottom walls 10 and a back plate 11. for. As can be seen in particular from Figure 1, the smoke shelf 9 protrudes from the rear plate towards the front wall 4 of the firebox so far that a relatively narrow opening remains between its front edge and the front wall of the firebox. From the front edge of the smoke shelf 9, the hot plate fire plate 8 first protrudes obliquely downwards and backwards and after the fold point straight downwards parallel to the rear plate 11 up to the bottom wall 10. The heat core thus consists of two parts, a flat plate lower part and an upwardly extending upper part. The lower part rests on the bottom of the furnace, grate or the like.

Attached to the top of the heat core is an air baffle 12 parallel to the firebox 8 and the oblique portion and connected to the side walls 10 and / or 35 to the back plate 11. The bottom of the heat core has a damper 13 and the bottom of the heat core has room air inlets 14 4 and Connected to these openings are supply air ducts 16 and supply air ducts 17, respectively, the ducts of which have grilles 18 at the mouth of the furnace. The interior of the heat core is indicated by reference numeral 5 at 19.

All parts of the heat core 6 are made of e.g. cast iron or other refractory metal to achieve the best possible heat transfer, while the air ducts 16, 17 and grilles 18 can be made of e.g. 10 steel plates or other heat-resistant material.

In the furnace 1, the radiant heat of the burning fire and the heat of the flue gases are transferred through the walls of the firebox 8 and the smoke shelf 9 to the room air passing through the space 19 behind them. The heated air is led from the space 19 15 through the outlet openings 15 and the supply air ducts 17 to the outside of the furnace. At the same time, unheated room air flows through the supply air ducts 16 and inlet openings 14 inside the heating core 6 into the space 19. The heat transfer is enhanced by the air guide plate 12 in the space 19, as the air 20 flows along the entire length of the fire plate. The flow of heated air can be adjusted with the damper 13.

In practical experiments, it has been found that heat is generated from the charging furnace immediately after ignition. The temperature of the Kier-25 tollman at the outlet of the outlet channel is about 100 -120 ° C 15-20 minutes after ignition.

The heating core according to the invention can also be connected, for example, to the ductwork of an air heating plant or, if necessary, one of the supply air ducts and the supply air ducts 30 can be omitted and the connection openings of the ducts can be closed, for example, by masonry. It should be noted that the heat core may form the walls of more than one furnace.

If desired, water pipes can be installed on the inner surface of the fire plate 8 between the ribs or instead of the ribs. Put-35 cat warm water is suitable for domestic water, for example.