JP2025079390A - Stove - Google Patents

Abstract

An object of the present invention is to provide a stove that improves the efficiency of heat exchange between combustion air and combustion gas, and thereby improves the combustion efficiency of solid fuel. [Solution] A heat exchange section K for exchanging heat between the combustion air in the combustion chamber E of the main body 1 and the combustion gas comprises an outer cylinder 10 through which the combustion air flows in from the outside of the main body 1 and flows out to the combustion chamber E, and an inner cylinder 20 inserted into the outer cylinder 10. A plurality of pipes 30 are installed between the outer cylinder 10 and the inner cylinder 20 at a required interval, an outer opening 31 is formed in the outer cylinder 10, an inner opening 32 is formed in the inner cylinder, one end opening 21 of the inner cylinder 20 is connected to the chimney 2, the other end opening 23 of the inner cylinder 20 is closed, the space from the outer opening 31 through the inner opening 32 to the chimney 2 is configured as a gas passage space G through which the combustion gas can pass, and the space between the inner surface of the outer cylinder 10 and the outer surface of the inner cylinder 20 from the inlet 11 to the outlet 12 is configured as an air passage space Aa through which the combustion air can pass. [Selected drawing] Fig. 3

Description

The present invention relates to a stove that burns solid fuel such as firewood and is used primarily for heating, and in particular to a stove that preheats and supplies the combustion air required to burn the solid fuel.

Conventionally, an example of this type of stove is disclosed in JP 2010-133697 A (Patent Document 1).
This stove has a main body with a combustion chamber for burning solid fuel such as firewood or pellets, and combustion air is supplied to the combustion chamber of the main body to burn the solid fuel and generate combustion gas, which is exhausted from a chimney. The main body is equipped with a heat exchanger that exchanges heat between the combustion air and the combustion gas to warm and preheat the combustion air.

This heat exchange unit is comprised of a metal outer cylinder having a storage portion accommodated in the combustion chamber, an inlet for introducing combustion air from the outside of the main body, and an outlet for discharging the combustion air to the combustion chamber side, and a metal inner cylinder having one end opening located on the inlet side of the outer cylinder and the other end opening located on the outlet side of the outer cylinder, the outer surface of which is spaced apart from the inner surface of the outer cylinder and inserted into the outer cylinder, the outer cylinder and the inner cylinder forming a double cylinder section. The one end opening of the inner cylinder is connected to a chimney, and the combustion air is supplied to the combustion chamber through the outer cylinder, where solid fuel is burned to generate combustion gas, which is then exhausted from the chimney through the inner cylinder. During the combustion of this solid fuel, the double cylinder section formed by the outer and inner cylinders of the heat exchange unit exchanges heat between the combustion air and the combustion gas, warming and preheating the combustion air to improve the combustion efficiency of the solid fuel.

JP 2010-133697 A

In the conventional stoves described above, heat exchange between the combustion air and combustion gas is carried out in the double-cylinder section formed by the outer and inner cylinders of the heat exchange unit, and the combustion air is warmed and preheated to improve the combustion efficiency of the solid fuel. However, since the combustion air only comes into contact with the inner surface of the outer cylinder and the outer surface of the inner cylinder, there is a problem that the heat exchange efficiency is not necessarily good.
The present invention has been made in consideration of these problems, and aims to provide a stove that improves the heat exchange efficiency between the combustion air and the combustion gas, and improves the combustion efficiency of solid fuel.

In order to achieve the above object, the stove of the present invention comprises a main body having a combustion chamber for burning solid fuel, and a heat exchanger that supplies combustion air to the combustion chamber of the main body to burn the solid fuel and generate combustion gas, which is exhausted from a chimney, and that exchanges heat between the combustion air and the combustion gas to heat the combustion air,
The heat exchange section is configured to include a metallic outer cylinder having an accommodation portion accommodated within the combustion chamber and having an inlet for introducing combustion air from the outside of the main body and an outlet for discharging the combustion air to the combustion chamber side, and a metallic inner cylinder having one end opening located on the inlet side of the outer cylinder and the other end opening located on the outlet side of the outer cylinder, the outer surface of which is spaced apart from the inner surface of the outer cylinder and inserted into the outer cylinder, and a plurality of metallic tubes are installed at required intervals between a wall portion constituting the accommodation portion of the outer cylinder and a corresponding wall portion constituting the inner cylinder, and a plurality of metallic tubes are provided on the outer surface of the outer cylinder, which communicate with the inside of the tubes and have an opening into the combustion chamber. an outer opening is formed through the outer tube, an inner opening is formed on the inner surface of the inner tube that communicates with the inside of the tubular body and opens into the interior of the inner tube, one end opening and/or the other end opening of the inner tube is connected to the chimney, and when either one of the one end opening or the other end opening of the inner tube is connected to the chimney, the other of the one end opening or the other end opening that is not connected to the chimney is closed, the space from the outer opening through the inner opening to the chimney is configured as a gas passage space through which combustion gas can pass, and the space between the inner surface of the outer tube and the outer surface of the inner tube, from the inlet to the outlet, is configured as an air passage space through which combustion air can pass.

Here, multiple tubes are provided at required intervals, but the required intervals and the number of tubes may be determined as appropriate. The manner of connection between the inner tube and the chimney may be changed as appropriate, in which one end opening and the other end opening of the inner tube are each connected to a chimney as shown in FIG. 6(a), or in which a chimney is connected to one end opening of the inner tube and the other end opening is closed as shown in FIG. 6(b), or in which one end opening of the inner tube is closed and a chimney is connected to the other end opening as shown in FIG. 6(c).

As a result, when solid fuel is burned, combustion air flows in through the inlet of the outer tube of the heat exchanger and flows out through the outlet, and is supplied to the combustion chamber, where the solid fuel is burned. The combustion gas generated by the combustion of this solid fuel passes from the outer opening formed in the outer tube through the tube body, enters the inner tube through the inner opening, and is exhausted through the inner tube from the chimney. That is, the combustion gas passes through the gas passage space of the heat exchanger and is exhausted from the chimney, and the combustion air passes through the air passage space of the heat exchanger and is supplied to the combustion chamber, where heat exchange between the combustion air and the combustion gas occurs in this heat exchanger. Therefore, the combustion air is heated and preheated. In this case, the combustion air not only contacts the inner surface of the outer tube and the inner surface of the inner tube in the air passage space, but also contacts the surface of the tube body, so that the contact area with the part heated by the combustion gas is larger than in the conventional case, and therefore the heat exchange efficiency can be improved, and the combustion efficiency of the solid fuel can be improved accordingly. In addition, because the combustion gas passes through multiple tubes before entering the inner cylinder, the residence time is longer, ensuring that secondary combustion takes place in the gas passage space, which also improves combustion efficiency.

and, if necessary, configuring the main body to include a metal bottom wall portion, a ceiling wall portion and a side wall portion surrounding the combustion chamber, and providing an opening portion in the side wall portion and/or the ceiling wall portion that can be opened and closed by an opening/closing body for introducing solid fuel into the combustion chamber;
The bottom wall and/or the side wall of the main body are double-layered with wall plates to form an air flow space between the double wall plates through which the combustion air can flow,
the outer cylinder is formed in a cylindrical shape having one opening and the other opening, the one opening of the outer cylinder is disposed so as to face the outside of the main body and the other opening of the outer cylinder is disposed so as to face the air circulation space, the one opening constitutes the inlet, and the other opening constitutes the outlet,
An outlet for blowing out the combustion air from the air flow space into the combustion chamber is formed in the bottom wall and/or the side wall of the main body which constitutes the air flow space.

As a result, the structure can be simplified since the inlet for the combustion air is configured from one opening of the outer cylinder, and the outlet is configured from the other opening. Also, the combustion air is heated in the heat exchanger, flows out from the outlet of the outer cylinder that forms the air passage space into the air circulation space, and is supplied to the combustion chamber from the outlet. In this case, the air circulation space is formed in the bottom wall and/or side wall of the main body that is heated in the combustion chamber, so the combustion air is further heated here as it passes through, and since the outlet is provided in the bottom wall and/or side wall of the main body, the outlet can be formed in a place where solid fuel is easily combusted, compared to when the outlet is simply configured from the other opening of the outer cylinder, which improves combustion efficiency.

In this configuration, if necessary, the bottom wall is formed in two layers with a lower wall plate and an upper wall plate provided on the lower wall plate at a predetermined distance, the air circulation space is formed between the lower wall plate and the upper wall plate, the other opening side of the outer tube is joined to the upper wall plate and the outer tube is erected on the upper wall plate, an upper through-hole is formed in the ceiling wall portion through which one opening of the outer tube faces the outside of the main body, a lower through-hole is formed in the upper wall plate of the bottom wall portion through which the other opening of the outer tube faces the air circulation space, and the blow-out port is formed between the edge of the upper wall plate on the side wall portion side and the side wall portion. Since the blow-out port is formed along the side wall portion and the combustion air is blown out from below to above, the support of the solid fuel against the bottom wall portion is stabilized, making it easier to burn, and in this respect, the combustion efficiency can be improved.

If necessary, the main body is configured to have a front and a back, the opening is provided on the front side wall of the main body, the outer tube and the inner tube are provided in contact with or close to the back side wall, and the air outlet is formed between the edge of the upper wall plate on the front side and the front side wall. Combustion air is supplied from the front side to the back side, so that the solid fuel can be burned reliably.

Furthermore, if necessary, the edge of the upper wall plate that forms the air outlet can be curved and raised so that it is convex toward the front when viewed from the side. The combustion air from the air outlet is guided between the curved end of the upper wall plate and the side wall portion and supplied to the combustion chamber, so the air outlet is less likely to be blocked by solid fuel, and the combustion of solid fuel can be carried out more reliably.

Furthermore, if necessary, the upper wall plate can be provided with a plurality of support plates at predetermined intervals, each of which has a vertical surface direction and can support solid fuel. Because the solid fuel is placed on the upper edge of the comb-shaped support plates, it becomes easier to supply combustion air from below, which also makes it possible to more reliably burn the solid fuel.

If necessary, the outer and inner cylinders may be formed into cylindrical shapes and arranged so that the center lines of the outer and inner cylinders are coaxial, and the multiple tubes may be arranged so that their axes intersect and are perpendicular to the center lines of the outer and inner cylinders. This allows the combustion gases that have passed through each tube to join and concentrate in the center of the inner cylinder, effectively increasing the combustion temperature and further improving the combustion efficiency.
In this case, it is effective to provide a plurality of the tubes at equal intervals along the center line direction of the outer and inner cylinders to form a tube row of the tubes, and to provide a plurality of rows of the tube rows at required intervals along the circumferential direction of the outer and inner cylinders. As a result, the tubes are arranged in a matrix around the inner cylinder, so that the combustion air passing through the air passage space comes into contact with the outer tubes evenly, thereby improving the heat exchange efficiency with the combustion gas. In addition, the outer openings communicating with the tubes are formed in a matrix on the outer surface of the outer cylinder, so that the combustion gas is introduced into the inner cylinder evenly from the periphery of the outer cylinder, and the flow of the combustion gas is stabilized, so that the combustion of the solid fuel can be more reliably performed in this respect as well.

According to the present invention, heat exchange takes place between the combustion air and the combustion gas in the heat exchange section. In this case, the combustion air not only comes into contact with the inner surfaces of the outer and inner tubes in the air passage space, but also with the surface of the tubes, so that the contact area with the area heated by the combustion gas is larger than in the past, improving the heat exchange efficiency and thus improving the combustion efficiency of the solid fuel. In addition, the combustion gas enters the inner tube through multiple tubes, so the residence time is longer, ensuring secondary combustion in the gas passage space, which also improves the combustion efficiency.

1 is a perspective view showing a stove according to an embodiment of the present invention. 1 is a front cross-sectional view showing a stove according to an embodiment of the present invention. 1 is a side cross-sectional view showing a stove according to an embodiment of the present invention. 1 is a plan cross-sectional view showing a stove according to an embodiment of the present invention. 1 is a partially cutaway perspective view showing a heat exchanger of a stove according to an embodiment of the present invention. 1A shows the connection mode between the heat exchange section and the chimney in a stove according to an embodiment of the present invention, where (a) is a diagram showing one end opening and the other end opening of the inner tube connected to the chimney, (b) is a diagram showing one end opening of the inner tube connected to the chimney and the other end opening closed, and (c) is a diagram showing the other end opening of the inner tube connected to the chimney and the one end opening closed.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a stove according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
1 to 5, a stove S according to an embodiment of the present invention comprises a main body 1 having a combustion chamber E for burning solid fuel W such as firewood, and combustion air is supplied to the combustion chamber E of the main body 1 to burn the solid fuel W, generating combustion gas which is exhausted from a chimney 2. The main body 1 is provided with legs 3 for supporting it.

In detail, the main body 1 is configured to have a front and a back, and includes a bottom wall 4, a ceiling wall 5, and a side wall 6 made of metal such as iron that surround the combustion chamber E. The bottom wall 4 and the ceiling wall 5 are formed in a semicircular shape when viewed from above, and the back side is curved. The chimney 2 is installed above the ceiling wall 5, in the center of the back. The side wall 6 is provided between the bottom wall 4 and the ceiling wall 5, and the back side side wall 6 is curved following the curved shape of the bottom wall 4 and the ceiling wall 5, and the front side side wall 6 is formed in a flat plate shape. The side wall 6 and/or the ceiling wall 5 (the front side side wall 6 in the embodiment) have an opening 8 that can be opened and closed by an opening and closing body 7 for putting solid fuel W into the combustion chamber E. The opening and closing body 7 is configured as a door that can be opened and closed by a hinge.

The stove S according to the embodiment is equipped with a heat exchanger K that heats the combustion air by exchanging heat between the combustion air and the combustion gas. The heat exchanger K is composed of an outer cylinder 10 made of a metal such as iron, which has a storage area Ka that is stored in the combustion chamber E and an inlet 11 for introducing the combustion air from the outside of the main body 1 and an outlet 12 for discharging the combustion air to the combustion chamber E side, and an inner cylinder 20 made of a metal such as iron, which has an opening at one end 21 located on the inlet 11 side of the outer cylinder 10 and an opening at the other end 22 located on the outlet 12 side of the outer cylinder 10, and whose outer surface is spaced apart from the inner surface of the outer cylinder 10 and is inserted into the outer cylinder 10. The outer cylinder 10 and the inner cylinder 20 are formed in a cylindrical shape and are arranged so that the center lines P of the outer cylinder 10 and the inner cylinder 20 are coaxial.

In the heat exchange section K, a plurality of metal tubes 30 are installed by welding or the like at required intervals between the wall portion constituting the storage portion Ka of the outer tube 10 and the corresponding wall portion constituting the inner tube 20. An outer opening 31 that communicates with the inside of the tube 30 and opens to the combustion chamber E is formed on the outer surface of the outer tube 10, and an inner opening 32 that communicates with the inside of the tube 30 and opens to the inside of the inner tube 20 is formed on the inner surface of the inner tube 20. Each of these plurality of tubes 30 is provided so that its axis Q intersects and is perpendicular to the center line P of the outer tube 10 and the inner tube 20. A plurality of tubes 30 are provided at equal intervals along the center line P direction of the outer tube 10 and the inner tube 20 to form a tube row of the tubes 30, and the tube rows are provided in a plurality of rows at required intervals along the circumferential direction of the outer tube 10 and the inner tube 20. In this embodiment, the tube rows (L1 to L5) are made up of five tubes 30, and there are five rows in total. As shown in FIG. 4, the spacing between adjacent tube rows (L1 to L5) is two rows on each side of one tube row (L1: a tube row in which the outer opening 31 described below faces forward), spaced at an interval of θ (60°).

The one end opening 21 and/or the other end opening 22 of the inner cylinder 20 are connected to the chimney 2, and when either the one end opening 21 or the other end opening 22 of the inner cylinder 20 is connected to the chimney 2, the other of the one end opening 21 and the other end opening 22 that is not connected to the chimney 2 is closed with a metal closing side plate 23. That is, in the present invention, as shown in FIG. 6(a), both the one end opening 21 and the other end opening 22 of the inner cylinder 20 are connected to the chimney 2, as shown in FIG. 6(b), one end opening 21 of the inner cylinder 20 is connected to the chimney 2 and the other end opening 22 is closed with a closing side plate 23, and as shown in FIG. 6(c), one end opening 22 of the inner cylinder 20 is connected to the chimney 2 and one end opening 21 is closed with a closing side plate 23 can be adopted. In this embodiment, as shown in Figures 1 to 3, one end opening 21 of the inner cylinder 20 is connected to the chimney 2 via a connecting pipe 24, and the other end opening 22 is closed (the embodiment shown in Figure 6 (b)).

As a result, in this embodiment, the space extending from the outer opening 31 through the inner opening 32 to the chimney 2 is configured as a gas passage space G through which combustion gas can pass, and the space between the inner surface of the outer cylinder 10 and the outer surface of the inner cylinder 20, extending from the inlet 11 to the outlet 12, is configured as an air passage space Aa through which combustion air can pass.

The bottom wall 4 and/or side wall 6 (bottom wall 4 in the embodiment) of the main body 1 are formed with two layers of wall plates, and an air flow space Ab through which the combustion air can flow is formed between the two layers of wall plates. That is, the bottom wall 4 is formed with two layers of lower wall plate 4a and upper wall plate 4b provided on the lower wall plate 4a at a predetermined distance, and an air flow space Ab is formed between the lower wall plate 4a and the upper wall plate 4b.

In the heat exchange section K, the outer cylinder 10 is formed in a cylindrical shape having one opening 13 and the other opening 14, the one opening 13 facing the outside of the main body 1, the other opening 14 facing the air circulation space Ab, the inlet 11 is formed by the one opening 13, and the outlet 12 is formed by the other opening 14. The outer cylinder 10 and the inner cylinder 20 are provided in contact with or close to the side wall portion 6 on the back side of the main body 1, and the outer cylinder 10 is erected by joining the other opening 14 side of the outer cylinder 10 to the upper wall plate 4b. The ceiling wall portion 5 has an upper through hole 15 through which the one opening 13 of the outer cylinder 10 faces the outside of the main body 1, and the upper wall plate 4b of the bottom wall portion 4 has a lower through hole 16 through which the other opening 14 of the outer cylinder 10 faces the air circulation space Ab. One opening 13 of the outer cylinder 10 protrudes slightly from the ceiling wall 5, and its outer periphery is welded to the upper through hole 15 of the ceiling wall 5, while the edge of the other opening 14 of the outer cylinder 10 is welded to the lower through hole 16 of the upper wall plate 4b of the bottom wall 4. The outer cylinder 10 is also installed so that the outer opening 31 of the tube row L1 faces forward.

As a result, the outer cylinder 10 is fixed to the bottom wall 4 and the ceiling wall 5, the inner cylinder 20 is supported by the outer cylinder 10 via the tube body 30, and the chimney 2 is supported by the inner cylinder 20 via the connecting pipe 24, so that the inner cylinder 20 and the chimney 2 can be securely supported on the main body 1.

Furthermore, the bottom wall 4 and/or side wall 6 (bottom wall 4 in the embodiment) of the main body 1 constituting the air flow space Ab has an air outlet 40 for blowing out the combustion air from the air flow space Ab to the combustion chamber E. The air outlet 40 is formed between the edge 41 of the upper wall plate 4b on the side wall 6 side and the side wall 6. In the embodiment, the air outlet 40 is formed between the edge 41 of the upper wall plate 4b on the front side and the side wall 6 on the front side. Also, as shown in FIG. 3, the end 42 at the edge 41 of the upper wall plate 4b forming the air outlet 40 is curved and raised so as to be convex toward the front side when viewed from the side.

Furthermore, the upper wall plate 4b is provided with a plurality of support plates 50 at predetermined intervals, each of which can support solid fuel W and has a surface direction aligned in the vertical direction.

Therefore, when burning solid fuel W such as firewood with the stove S according to this embodiment, as shown in Figs. 1 to 4, the opening and closing body 7 is opened and the solid fuel W is put into the combustion chamber E through the opening 8 and ignited. When burning this solid fuel W, the combustion air flows in through the inlet 11 of the outer cylinder 10 of the heat exchanger K, flows out from the outlet 12 of the outer cylinder 10 into the air flow space Ab, and is supplied into the combustion chamber E through the outlet 40. The combustion gas generated by the combustion of this solid fuel W passes through the outer opening 31 formed in the outer cylinder 10, passes through the tube 30, enters the inner cylinder 20 through the inner opening 32, and is exhausted from the chimney 2 through the inner cylinder 20. That is, the combustion gas passes through the gas passage space G of the heat exchanger K and is exhausted from the chimney 2, and the combustion air passes through the air passage space Aa and the air flow space Ab of the heat exchanger K and is supplied to the combustion chamber E, and heat exchange between the combustion air and the combustion gas is performed in this heat exchanger K. Therefore, the combustion air is heated and preheated. In this case, the combustion air not only contacts the inner surface of the outer tube 10 and the inner surface of the inner tube 20 in the air passage space Aa, but also contacts the surface of the tube 30, so the contact area with the part heated by the combustion gas is larger than in the conventional case, and the heat exchange efficiency can be improved, and the combustion efficiency of the solid fuel W can be improved accordingly. In addition, since the combustion gas enters the inner tube 20 through multiple tubes 30, the residence time is longer, and secondary combustion can be reliably performed in the gas passage space G, which also improves the combustion efficiency.

In addition, each of the multiple tubes 30 is arranged so that its axis Q intersects and is perpendicular to the center line P of the outer tube 10 and the inner tube 20, so that the combustion gas passing through each tube 30 merges and concentrates in the center of the inner tube 20, effectively increasing the combustion temperature and further improving the combustion efficiency. Furthermore, since the tube rows (L1 to L5) of the tubes 30 are arranged in multiple rows at required intervals along the circumferential direction of the outer tube 10 and the inner tube 20, the tubes 30 are arranged in a matrix around the inner tube 20, so that the combustion air passing through the air passage space Aa comes into contact with the outer tubes evenly, thereby improving the heat exchange efficiency with the combustion gas. In addition, the outer openings 31 communicating with the tubes 30 are formed in a matrix on the outer surface of the outer tube 10, so that the combustion gas is introduced into the inner tube 20 evenly from the periphery of the outer tube 10, and the flow of the combustion gas is stabilized, so that the combustion of the solid fuel W can be performed more reliably in this respect as well.

Furthermore, in this case, the air flow space Ab is formed in the bottom wall 4 and/or side wall 6 (bottom wall 4 in the embodiment) of the main body 1, which is heated in the combustion chamber E, so that the combustion air is further heated here as it passes through. Also, since the blow-out port 40 is provided in the bottom wall 4 and/or side wall 6 (bottom wall 4 in the embodiment) of the main body 1, the blow-out port 40 can be formed in a place where the solid fuel W is easily combusted, compared to when the blow-out port 40 is simply configured as the other opening 14 of the outer cylinder 10, so that the combustion efficiency can be improved accordingly. In the embodiment, the blow-out port 40 is formed between the edge 41 of the upper wall plate 4b on the front side and the side wall 6 on the front side, so that the combustion air is supplied from the front side to the back side, so that the combustion of the solid fuel W can be reliably performed. In addition, since the blow-out port 40 is formed along the side wall 6 and the combustion air is blown out from the bottom to the top, the support of the solid fuel W against the bottom wall 4 can be stabilized, making it easier to burn, and in this respect, the combustion efficiency can also be improved.

Furthermore, the end 42 of the edge 41 of the upper wall plate 4b that forms the air outlet 40 is curved and raised so that it is convex toward the front when viewed from the side, so that the combustion air from the air outlet 40 is guided between the curved end 42 of the upper wall plate 4b and the side wall portion 6 and supplied into the combustion chamber E, making it difficult for the air outlet 40 to be blocked by the solid fuel W, and allowing the solid fuel W to be burned more reliably. Furthermore, because the solid fuel W is placed on the upper edge of the comb-shaped support plate 50, it is easier for the combustion air to be supplied from below, and in this respect, too, the solid fuel W can be burned more reliably.

In the above embodiment, the tubes 30 of the heat exchange section K are provided at a required interval, but the required interval and the number of tubes 30 may be determined as appropriate. In the above embodiment, the connection between the inner tube 20 and the chimney 2 is shown in Figs. 1 to 3 and Fig. 6 (b) with the chimney 2 connected to one end opening 21 of the inner tube 20 and the chimney 2 closed at the other end opening 22, but this is not necessarily limited to this. As shown in Fig. 6 (a), the one end opening 21 and the other end opening 22 of the outer tube 10 may be connected to the chimney 2, respectively, or as shown in Fig. 6 (c), the one end opening 21 of the inner tube 20 may be closed and the chimney 2 may be connected to the other end opening 22, and may be modified as appropriate. Furthermore, in the above embodiment, the outer tube 10 and the inner tube 20 are erected on the bottom wall 4, but this is not necessarily limited to this, and may be modified as appropriate, for example, by bridging between the side walls 6.

In the above embodiment, the air flow space Ab and the air outlet 40 are provided in the bottom wall 4, but this is not necessarily limited to this. They may be provided in both the bottom wall 4 and the side wall 6, or in the side wall 6 (see FIG. 6), and may be modified as appropriate. Of course, the position of the air outlet 40 may also be determined as appropriate. Furthermore, the shape of the main body 1 is not limited to the above shape, and may be formed into any shape, such as a rectangular or cylindrical shape formed by connecting the bottom wall 4, ceiling wall 5, and side wall 6. In addition, the opening 8 that opens and closes with the opening/closing body 7 may be provided not only in the side wall 6 but also in the ceiling wall 5.

Furthermore, in the above embodiment, the bottom wall 4, the ceiling wall 5, and the side wall 6 are made of metal, but this is not necessarily limited to this, and as long as the heat exchange section K is made of metal, it may be made of any material, such as stone or ceramic, as long as it is heat resistant. In addition, in the above embodiment, the solid fuel W is not limited to firewood, and can of course be any material, such as peat, coal, lignite, bituminous coal, anthracite, coke, briquettes, wood pellets, sawdust light, sawdust charcoal, charcoal, wax, various solid fuels, etc. In short, those skilled in the art can easily make many modifications to these exemplary embodiments without substantially departing from the novel teachings and effects of the present invention, and many of these modifications are included in the scope of the present invention.

S stove W solid fuel 1 main body E combustion chamber K heat exchange section Ka accommodation section 2 chimney 3 legs 4 bottom wall section 4a lower wall plate 4b upper wall plate 5 ceiling wall section 6 side wall section 7 opening/closing body 8 opening 10 outer cylinder 11 inlet 12 outlet 13 one opening 14 other opening 15 upper through opening 16 lower through opening 20 inner cylinder 21 one end opening 22 other end opening 23 closing plate 24 connecting pipe 30 pipe body 31 outer opening 32 inner openings L1 to L5 pipe body row G gas passage space Aa air passage space Ab air circulation space 40 blow-out port 41 edge 42 end 50 support plate

Claims (8)

A stove comprising a main body having a combustion chamber for burning solid fuel, supplying combustion air to the combustion chamber of the main body to burn the solid fuel and generate combustion gas, which is exhausted from a chimney, and also comprising a heat exchanger for exchanging heat between the combustion air and the combustion gas to warm the combustion air,
The heat exchange section is configured to include a metal outer cylinder having an accommodation portion accommodated within the combustion chamber and having an inlet for introducing combustion air from the outside of the main body and an outlet for discharging the combustion air to the combustion chamber side, and a metal inner cylinder having one end opening located on the inlet side of the outer cylinder and the other end opening located on the outlet side of the outer cylinder, the outer surface of which is inserted into the outer cylinder with a space between the inner surface of the outer cylinder, a plurality of metal tubes are installed at required intervals between a wall portion constituting the accommodation portion of the outer cylinder and a corresponding wall portion constituting the inner cylinder, and an outer opening communicating with the inside of the tube and opening into the combustion chamber is provided on the outer surface of the outer cylinder. a space extending from the outer opening through the inner opening to the chimney is configured as a gas passage space through which combustion gas can pass, and a space between the inner surface of the outer cylinder and the outer surface of the inner cylinder, from the inlet to the outlet, is configured as an air passage space through which combustion air can pass. the main body is configured to include a bottom wall portion, a ceiling wall portion and a side wall portion which are made of metal and which surround the combustion chamber, and an opening portion which can be opened and closed by an opening/closing body is provided in the side wall portion and/or the ceiling wall portion for introducing solid fuel into the combustion chamber,
The bottom wall and/or the side wall of the main body are double-layered with wall plates to form an air flow space between the double wall plates through which the combustion air can flow,
the outer cylinder is formed in a cylindrical shape having one opening and the other opening, the one opening of the outer cylinder is disposed so as to face the outside of the main body and the other opening of the outer cylinder is disposed so as to face the air circulation space, the one opening constitutes the inlet, and the other opening constitutes the outlet,
2. The stove according to claim 1, wherein an outlet is formed in the bottom wall and/or side wall of the main body which defines the air flow space, for blowing out combustion air from the air flow space into the combustion chamber. The stove according to claim 2, characterized in that the bottom wall is formed in two layers with a lower wall plate and an upper wall plate provided on the lower wall plate at a predetermined distance, the air circulation space is formed between the lower wall plate and the upper wall plate, the other opening side of the outer tube is joined to the upper wall plate and the outer tube is erected on the upper wall plate, an upper through hole is formed in the ceiling wall portion with one opening of the outer tube facing the outside of the main body, a lower through hole is formed in the upper wall plate of the bottom wall portion with the other opening of the outer tube facing the air circulation space, and the air outlet is formed between the edge of the side wall portion of the upper wall plate and the side wall portion. The stove according to claim 3, characterized in that the main body is configured to have a front and a back, the opening is provided on the side wall of the front of the main body, the outer tube and the inner tube are provided in contact with or adjacent to the side wall of the back, and the air outlet is formed between the edge of the upper wall plate on the front side and the side wall on the front side. The stove according to claim 4, characterized in that the edge of the upper wall plate that forms the air outlet is curved and raised so that it is convex toward the front when viewed from the side. The stove according to claim 5, characterized in that the upper wall plate is provided with a plurality of support plates at predetermined intervals that can support solid fuel and whose surfaces are aligned vertically. The stove according to any one of claims 1 to 6, characterized in that the outer and inner cylinders are formed cylindrically and arranged so that the center lines of the outer and inner cylinders are coaxial, and the multiple tubes are arranged so that their axes intersect and are perpendicular to the center lines of the outer and inner cylinders. The stove according to claim 7, characterized in that a plurality of the tubes are provided at equal intervals along the center line direction of the outer and inner cylinders to form a tube row of the tubes, and the tube rows are provided in a plurality of rows at required intervals along the circumferential direction of the outer and inner cylinders.

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