WO1990005270A1

WO1990005270A1 - Accumulating night electricity hearth

Info

Publication number: WO1990005270A1
Application number: PCT/FI1989/000200
Authority: WO
Inventors: Juhani Lehikoinen
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-11-09
Filing date: 1989-10-31
Publication date: 1990-05-17
Anticipated expiration: 1991-05-09
Also published as: FI85422C; FI885145A0; CA2002019A1; FI885145L; FI85422B

Abstract

Object of the invention is an accumulating night electricity hearth, to which belongs a furnace (1) with its structures and in the close neighbourhood of the furnace placed heat accumulator, which consists of an accumulating mass (2) for storing of the heat and of heat resistors (3) for heating up of the accumulating mass. In the present night electricity hearths the heat stored in the accumulating mass cannot efficiently be spread out to the rest of the structure of the hearth. In a night electricity hearth in accordance with the invention the accumulating mass (2) has been placed on at least one of the sides of the furnace and arranged to form the side wall of the furnace, and the heat resistors (3) have been arranged inside these side walls.

Description

ACCUMULATING NIGHT ELECTRICITY HEARTH

Object for the invention is an accumulating night electricity hearth, to which belongs a furnace with its structures and in the close neighbourhood of the furnace located heat accumulator, which consists of the accumulating mass for heat accumulation and the heat resistors for heating of the accumulating mass .

The accumulating night electricity hearths are used as structures recovering, storing and delivering heat. The mass of the heat accumulator is heated up by means of electric resistors when the electric ener¬ gy is favourable, for instance during the night. As the mass of the accumulator for the purpose suitable materials are used, such as rock. In the accumulating hearths it is endeavoured to transfer the heat from the accumulator to the other parts of the hearth and from there into the room space. As also the other parts of the hearth become heated, the hearth is made to deliver heat into the room space evenly and for a long time. In the present accumulating hearths the accumulating mass is placed underneath the furnace, and the heat generated with electric resistors does not spread out to the other structures of the hearth without special constructions. Additionally the disad¬ vantage with the present accumulating hearths is the space the accumulating mass occupies underneath the furnace, whereat the furnace rises higher than the accustomed system is, which has an effect on the convenience in use and on the outlook.

The purpose of the invention is to bring about an accumulating night electricity hearth, where the by means of electric resistors into the accumulating mass brought heat is spread out well to the other structure of the hearth and from there into the room space, and in which due to the positioning of the accumulating mass the outer casing of the furnace is not overheated. Additionally the aim of the invention is to bring forth a night electricity hearth, in which no special constructions are needed for trans¬ ferring of the heat from the accumulating mass to the other stucture, and which to its outlook is like an ordinary hearth.

The purpose of the invention is achieved with an accumulating night electricity hearth, which is charac¬ terized by that, what is presented in the claims.

In the accumulating night electricity hearth in accord- ance with the invention the accumulating mass is positioned on at leaεt one side of the furnace and arranged to form the side wall of the furnace. In addition the heat resistors are arranged inside of this side wall. In the different applications of the invention the accumulating mass can be placed on one or more sides of the furnace. When heating the hearth in the ordinary way with wood or correspond¬ ing fuels .the accumulating mass on the side/sides of the furnace is heated and when the burning is finished delivers heat to the other structures of the hearth and from them into the room space. The accumulating mass is heated alternatively by means of the inside it positioned heat resistors and hereat the heat is spread out evenly on all sides in the other " structures of the hearth and from them into the room space during the electric heating and after that. When the accumulating mass is sufficiently large the accumulative effect is obtained as a maximum possible. Due to the positioning of the accumulating mass the outer casing of the furnace is not overheated, and for the heat transfer no special constructions are needed. With minor additions into an ordinary wood hearth an accumulating mass in accordance with the invention can be placed. An advantage of the structure in accordance with the invention is also, that it is not necessary to place underneath the furnace an accumulating mass, and thus the usability and outlook of the furnace are improved.

In a favourable application of the invention between the sidewall of the furnace, inside which the heat resistors are positioned, and the outer wall of the night electricity hearth has been formed a smoke flue, through which the combustion gas has been arranged to be extracted from the furnace. In an other favourable application of the invention inside both of the side walls heat resistors have been positioned and between the side walls and the outer walls of the night elec¬ tricity hearth smoke flues have been formed. When the combustion gas circulates through the smoke flues it heats up the accumulating mass of the side walls from the other side as well, whereat the differences in temperatures between that on the furnace side of the accumulating mass and that on the other side are not too big. In addition the heat contained in the combustion gas can be recovered in an efficient way. The heat resistors have been placed inside the side walls, whereby they do not come in contact with the combustion gas, which increases their serviceable life. The accumulating mass forms in some applications the whole side wall of the furnace, whereas again in some applications the accumulating mass has been placed on a part of the side wall of the furnace only. The form of the accumulating mass and of the smoke flues can vary in the different applications of the invention.

In the third favourable application of the invention the accumulating mass has been placed on the sides of the furnace in the hearth, in which the combustion gases are not circulated on the side or sides, but they are led directly away from the hearth. The hearth is simple to its structure and with the help of it the heat delivered by the furnace and the electric resistors is recovered efficiently and spread out evenly in the other structures and from them into the room space.

In the following the invention is explained more in detail by referring to the attached drawing, in which figure 1 presents one application of an accumulating night electricity hearth in accordance with the inven¬ tion in cross-section and seen from the front, and figure 2 presents the section A-A in the figure 1.

In one favourable application of the electric hearth in accordance with the invention presented in ^" the figures 1 and 2 to the night electricity hearth belongs the furnace 1 with its structures, to which structures belong the side walls 2 of the furnace and the outer wall 4 of the hearth. The side walls are formed of soap rock elements and the side walls are arranged to form the accumulating mass of the hearth. The soap rock elements are positioned in two walls in such a way, that between the walls is a space 6, in which the heat resistor 3 is placed. The heat resistor 3 is in this application arranged in the form of a loop and it is fastened inside the space with the help of pins 7 and supports 8. The pins and supports keep in addition the heat resistor at an optional distance from the walls.

Between the side walls 2 of the furnace and the outer wall 4 of the hearth are formed the smoke flues 5, through which the combustion gas is led out from the hearth. The combustion gas coming from the furnace is firstly led upwards in the furnace and thereafter downwards along the smoke flues, whereat the accumulating mass is heated from the both sides. Finally the combustion gas is led through an in the lower part of the hearth positioned exhaust opening to the smoke chimney. Underneath the furnace is in the ordinary way placed an ash pit 9. On the both sides of the ash pit there are the spaces 10, through which the cables needed for the heat resistors are drawn. To the night electricity hearth belong additionally of a protective material made protections 11, which are placed on the inner surfaces of the outer walls in the upper part of the smoke flues to protect the structure.

The soap rock elements are in the night electricity hearth placed in the way presented in figure 1 in such a manner, that their cleavage is parallell with the transfer direct¬ ion of the heat, in other words horizontal in this applica¬ tion. Hereat the heat is transferred evenly and does not break the structure. The elements are in addition relative¬ ly small. When heating with fuel wood the difference in temperature on the different spots of the side walls of the furnace are substantial, but in a structure in accord¬ ance with the invention the difference in temperature in the different parts of one element is not such, that it would break up the structure.

In figure 2 is presented the sensing element 12 of the thermostat, which is placed between the back part of the side wall and the back wall of the hearth. With the help of the thermostat the heat resistors can be adjusted by taking .into account the temperature of the outer walls of the hearth.

The invention is not limited to the presented application, but it can vary within the frames of the claims.

Claims

1. An accumulating night electricity hearth, to which belongs a furnace (1) with its structures and in the close neighbourhood of the furnace placed heat accumulator, which consists of an accumulating mass (2) for storing of the heat and of heat resistors

(3) for heating up of the accumulating mass, c h a r a c t e r i z e d in, that the accumulating mass (2) is placed on at least one side of the furnace and arranged to form the side wall of the furnace, and that the heat resistors (3) are arranged in the inside of this side wall.

2. A night electricity hearth in accordance with claim 1, c h a r a c t e r i z e d in, that between the side wall of the furnace, inside which the heat resistors (3) are positioned, and the outer wall

(4) of the night electricity flue (5) has been formed, through which at least a part of the combustion gas has been arranged to be extracted.

3. A night electricity hearth in accordance with either claim 1 or 2, c h a r a c t e r i z e d in, that the accumulating mass (2) has been formed of soap rock elements, which have been placed in such a way, that their cleavage is parallell with the transfer direction of the heat.

4. A night electricity hearth in accordance with claim 3, c h a r a c t e r i z e d in, that the side . walls are formed of two soap rock element walls, between which a space (6) has been formed, in which the heat resistors (3) have been placed.