Stove

Abstract

To provide a stove which achieves improvement of heat exchange efficiency between combustion air and combustion gas and achieves improvement of combustion efficiency of a solid fuel.SOLUTION: A heat exchange part K for performing heat exchange between combustion air and combustion gas in a combustion chamber E of a body 1 comprises: an outer cylinder 10 for causing combustion air to flow in from the outside of the body 1 and flow out to the combustion chamber E side; and an inner cylinder 20 inserted into the outer cylinder 10. A plurality of pipe bodies 30 are installed at predetermined intervals between the outer cylinder 10 and the inner cylinder 20. An outer opening 31 is formed at the outer cylinder 10 and an inner opening 32 is formed at the inner cylinder. One end opening 21 of the inner cylinder 20 is connected to a chimney 2 and the other end opening 23 of the inner cylinder 20 is closed to form a space which extends from the outer opening 31 to the chimney 2 through the inner opening 32 as a gas passing space G through which combustion gas can pass, and to form a space which is located between an inner surface of the outer cylinder 10 and an outer surface of the inner cylinder 20 and extends from an inflow port 11 to an outflow port 12 as an air passing space Aa through which combustion air can pass.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a stove that burns solid fuel such as firewood and is used primarily for heating, and more particularly to a stove that preheats and supplies the combustion air required to burn the solid fuel. [Background technology]

[0002] Conventionally, as this type of stove, for example, the one disclosed in JP 2010-133697 A (Patent Document 1) is known. 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.

[0003] The heat exchanger includes a metal outer cylinder having a housing portion housed 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, and a metal inner cylinder having an opening at one end located on the inlet side of the outer cylinder and an opening at the other end 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 portion. The opening at one end of the inner cylinder is connected to a chimney, and the combustion air is supplied to the combustion chamber through the outer cylinder, and the solid fuel is burned in the combustion chamber to generate combustion gas, which is then exhausted from the chimney through the inner cylinder. During the combustion of the solid fuel, the double cylinder portion formed by the outer cylinder and the inner cylinder of the heat exchanger 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. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2010-133697 A Summary of the Invention [Problem to be solved by the invention]

[0005] 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. [Means for solving the problem]

[0006] 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 which 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 which 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.

[0007] Here, a plurality of 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, such as connecting one end opening and the other end opening of the inner tube to the chimney, as shown in Fig. 6(a), or connecting one end opening of the inner tube to the chimney and closing the other end opening, as shown in Fig. 6(b), or closing one end opening of the inner tube and connecting the chimney to the other end opening, as shown in Fig. 6(c).

[0008] As a result, when the solid fuel is burned, the combustion air flows in through the inlet of the outer cylinder of the heat exchanger and flows out through the outlet, and is supplied into the combustion chamber, where the solid fuel is burned. The combustion gas generated by the combustion of the solid fuel passes from the outer opening formed in the outer cylinder through the tube body, enters the inner cylinder through the inner opening, and is exhausted through the inner cylinder through 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 is performed in the heat exchanger. Therefore, the combustion air is heated and preheated. In this case, the combustion air contacts not only the inner surface of the outer cylinder and the inner surface of the inner cylinder in the air passage space, but also 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, since the combustion gas passes through multiple tubes before entering the inner cylinder, the residence time is increased accordingly, ensuring that secondary combustion takes place in the gas passage space, thereby improving combustion efficiency.

[0009] and, if necessary, configuring the main body with a metal bottom wall, a ceiling wall and a side wall surrounding the combustion chamber, providing an opening in the side wall and / or the ceiling wall that can be opened and closed by an opening and 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.

[0010] As a result, the inlet of the combustion air is formed by one opening of the outer cylinder, and the outlet is formed by the other opening, so that the structure can be simplified. Further, the combustion air is heated in the heat exchange section and flows out from the outlet of the outer cylinder that constitutes the air passage space into the air circulation space, and is supplied into the combustion chamber from the air outlet. In this case, since the air circulation space is formed in the bottom wall portion and / or the side wall portion of the main body heated by the combustion chamber, the combustion air is further heated here when passing through, and since the air outlet is provided in the bottom wall portion and / or the side wall portion of the main body, compared with the case where the air outlet is simply constituted by the other opening of the outer cylinder, the air outlet can be formed at a place where the solid fuel is easy to burn, so that the combustion efficiency can be improved accordingly.

[0011] In this configuration, if necessary, the bottom wall portion is formed in a double layer including a lower wall plate and an upper wall plate provided at a predetermined interval above the lower wall plate, the air circulation space is formed between the lower wall plate and the upper wall plate, the other opening side of the outer cylinder is joined to the upper wall plate and the outer cylinder is erected on the upper wall plate, an upper through-hole through which one opening of the outer cylinder faces the outside of the main body is formed in the ceiling wall portion, a lower through-hole through which the other opening of the outer cylinder faces the air circulation space is formed in the upper wall plate of the bottom wall portion, and it is effective that the air outlet is formed between the edge of the side wall portion side of the upper wall plate and the side wall portion. Since the air outlet is formed along the side wall portion and the combustion air blows out from the bottom upward, the support of the solid fuel against the bottom wall portion can be stabilized and it can be made even easier to burn, and the combustion efficiency can also be improved in this regard.

[0012] Further, if necessary, the main body is configured to have a front surface and a back surface, the opening portion is provided in the side wall portion of the front surface of the main body, the outer cylinder and the inner cylinder are provided in contact with or close to the side wall portion of the back surface, and the air outlet is formed between the edge of the upper wall plate on the front side and the side wall portion on the front side. Since the combustion air is supplied from the front side to the back side, the combustion of the solid fuel can be surely carried out.

[0013] Furthermore, if necessary, the edge of the upper wall plate forming the air outlet may be curved and raised so as to be 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 into the combustion chamber, so that the air outlet is less likely to be blocked by the solid fuel, and the combustion of the solid fuel can be performed more reliably.

[0014] Furthermore, if necessary, the upper wall plate may be provided with a plurality of support plates at predetermined intervals, each of which is capable of supporting solid fuel and has a surface direction aligned in a vertical direction. Since the solid fuel is placed on the upper edges of the comb-shaped support plates, it becomes easier for combustion air to be supplied from below, which also makes it possible to more reliably combust the solid fuel.

[0015] Furthermore, if necessary, the outer and inner cylinders are formed into cylindrical shapes 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. 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. Effect of the Invention

[0016] According to the present invention, in the heat exchange section, heat exchange between the combustion air and the combustion gas takes place, and in this case, the combustion air comes into contact with not only 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 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, since the combustion gas enters the inner tube through multiple tubes, the residence time is longer, and secondary combustion can be reliably performed in the gas passage space, which also improves the combustion efficiency. [Brief description of the drawings]

[0017] [Figure 1] 1 is a perspective view showing a stove according to an embodiment of the present invention. [Diagram 2] 1 is a front cross-sectional view showing a stove according to an embodiment of the present invention. [Diagram 3] 1 is a side cross-sectional view showing a stove according to an embodiment of the present invention. [Figure 4] 1 is a plan cross-sectional view showing a stove according to an embodiment of the present invention. [Diagram 5] 1 is a partially cutaway perspective view showing a heat exchanger of a stove according to an embodiment of the present invention. [Figure 6] FIG. 1 shows the connection mode between the heat exchange unit 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 one end opening closed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] 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 a 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.

[0019] 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 provided above the ceiling wall 5, and stands 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 shapes 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) are formed with an opening 8 that can be opened and closed by an opening and closing body 7 for putting the solid fuel W into the combustion chamber E. The opening and closing body 7 is configured with a door that can be opened and closed by a hinge.

[0020] The stove S according to the embodiment is provided 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 configured to include 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 through which the combustion air flows in from the outside of the main body 1 and an outlet 12 through which the combustion air flows out to the combustion chamber E side, and an inner cylinder 20 made of a metal such as iron, which has a one-end opening 21 located on the inlet 11 side of the outer cylinder 10 and a other-end opening 22 located on the outlet 12 side of the outer cylinder 10, and is inserted into the outer cylinder 10 with its outer surface spaced apart from the inner surface of 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.

[0021] In the heat exchange section K, a plurality of metal tubes 30 are installed by welding or the like at required intervals between a wall portion constituting the housing portion Ka of the outer tube 10 and a corresponding wall portion constituting the inner tube 20. An outer opening 31 communicating with the inside of the tube 30 and opening to the combustion chamber E is formed on the outer surface of the outer tube 10, and an inner opening 32 communicating with the inside of the tube 30 and opening to the inside of the inner tube 20 is formed on the inner surface of the inner tube 20. Each of the 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, five tube rows (L1 to L5) are provided in total, each row being composed of five tubes 30. As shown in Fig. 4, adjacent tube rows (L1 to L5) are spaced two rows on the left and right of one tube row (L1: a tube row in which an outer opening 31, described later, faces forward) at intervals of θ (60°).

[0022] 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 one of the one end opening 21 and 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 not connected to the chimney 2 is closed by a metal closed side plate 23. That is, in the present invention, as shown in Fig. 6(a), a mode in which 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), a mode in which the one end opening 21 of the inner cylinder 20 is connected to the chimney 2 and the other end opening 22 is closed by the closed side plate 23, and as shown in Fig. 6(c), a mode in which the other end opening 22 of the inner cylinder 20 is connected to the chimney 2 and the one end opening 21 is closed by the closed side plate 23 can be adopted. In the embodiment, as shown in Figs. 1 to 3, an embodiment is adopted in which one end opening 21 of an inner cylinder 20 is connected to a chimney 2 via a connecting pipe 24 and the other end opening 22 is closed (the embodiment in Fig. 6(b)).

[0023] 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 tube 10 and the outer surface of the inner tube 20 from the inlet 11 to the outlet 12 is configured as an air passage space Aa through which combustion air can pass.

[0024] In addition, the bottom wall 4 and / or the side wall 6 (bottom wall 4 in the embodiment) of the main body 1 are formed of double wall plates, and an air flow space Ab through which the combustion air can flow is formed between the double wall plates. That is, the bottom wall 4 is formed of a double wall plate 4a and an 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.

[0025] 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 being provided to face the air circulation space Ab, the inlet 11 being formed by the one opening 13, and the outlet 12 being 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 surface 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 is formed with 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 is formed with 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 side of the outer cylinder 10 protrudes slightly from the ceiling wall portion 5, and its outer periphery is welded and fixed to an upper through-hole 15 of the ceiling wall portion 5, while the edge of the other opening 14 of the outer cylinder 10 is welded and fixed to a lower through-hole 16 of the upper wall plate 4b of the bottom wall portion 4. In addition, the outer cylinder 10 is installed so that the outer opening 31 of the tube row L1 faces forward.

[0026] As a result, the outer cylinder 10 is fixed to the bottom wall portion 4 and the ceiling wall portion 5, the inner cylinder 20 is supported on the outer cylinder 10 via the tube body 30, and the chimney 2 is supported on 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.

[0027] Furthermore, an air outlet 40 for blowing out the combustion air from the air flow space Ab to the combustion chamber E is formed in the bottom wall 4 and / or the side wall 6 (bottom wall 4 in the embodiment) of the main body 1 constituting the air flow space Ab. The air outlet 40 is formed between an 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 an 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, an 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.

[0028] Furthermore, the upper wall plate 4b is provided with a plurality of support plates 50 at predetermined intervals, each of which is capable of supporting the solid fuel W and has a surface direction aligned in the vertical direction.

[0029] Therefore, when burning a 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 the solid fuel W, the combustion air flows in through the inlet 11 of the outer cylinder 10 of the heat exchanger K, flows out of 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 the 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 passing space G of the heat exchanger K and is exhausted from the chimney 2, and the combustion air passes through the air passing 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 warmed and preheated. In this case, the combustion air contacts not only the inner surfaces of the outer cylinder 10 and the inner cylinder 20 in the air passing space Aa, but also the surface of the tube body 30, so that the contact area with the part heated by the combustion gas becomes larger than in the conventional case, and therefore the heat exchange efficiency can be improved, and the combustion efficiency of the solid fuel W can be improved accordingly. In addition, the combustion gas enters the inner cylinder 20 through the multiple tube bodies 30, so the residence time becomes longer, and secondary combustion in the gas passing space G can be reliably performed, and in this respect as well, the combustion efficiency can be improved.

[0030] In addition, each of the multiple tubes 30 is provided so that its axis Q intersects and is perpendicular to the center line P of the outer cylinder 10 and the inner cylinder 20, so that the combustion gas passing through each tube 30 merges and concentrates at the center of the inner cylinder 20, effectively increasing the combustion temperature and further improving the combustion efficiency. Furthermore, the tube rows (L1 to L5) of the tubes 30 are provided in a plurality of rows at required intervals along the circumferential direction of the outer cylinder 10 and the inner cylinder 20, so that the tubes 30 are arranged in a matrix around the inner cylinder 20, so that the combustion air passing through the air passage space Aa contacts the outer tubes evenly, and the heat exchange efficiency with the combustion gas can be improved accordingly. In addition, the outer openings 31 communicating with the tubes 30 are formed in a matrix on the outer surface of the outer cylinder 10, so that the combustion gas is introduced into the inner cylinder 20 evenly from the periphery of the outer cylinder 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.

[0031] Furthermore, in this case, since the air flow space Ab is formed in the bottom wall 4 and / or the side wall 6 (bottom wall 4 in the embodiment) of the main body 1 which is heated in the combustion chamber E, the combustion air is further heated here when passing through. Also, since the air outlet 40 is provided in the bottom wall 4 and / or the side wall 6 (bottom wall 4 in the embodiment) of the main body 1, the air outlet 40 can be formed in a place where the solid fuel W is easily combusted, as compared with the case where the air outlet 40 is simply formed in the other opening 14 of the outer cylinder 10, and the combustion efficiency can be improved accordingly. 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, so that the combustion air is supplied from the front side to the rear side, and the combustion of the solid fuel W can be reliably performed. In addition, since the air outlet 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, and the combustion can be further facilitated, and in this respect, the combustion efficiency can also be improved.

[0032] Furthermore, since the end portion 42 of the upper wall plate 4b forming the air outlet 40, where the edge 41 is located, is curved and raised so as to protrude toward the front side when viewed from the side, the combustion air from the air outlet 40 is guided between the end portion 42 of the curved upper wall plate 4b and the side wall portion 6 and supplied into the combustion chamber E. As a result, the air outlet 40 is less likely to be blocked by the solid fuel W, and the combustion of the solid fuel W can be carried out more reliably. Furthermore, since the solid fuel W is placed on the upper edge of the comb-shaped support plate 50, it becomes easier to supply the combustion air from below, and in this regard as well, the combustion of the solid fuel W can be carried out more reliably.

[0033] In addition, in the above-described embodiment, a plurality of tube bodies 30 of the heat exchange section K are provided at a required interval, but the required interval and the number thereof may be determined as appropriate. Also, in the above-described embodiment, the connection mode between the inner cylinder 20 and the chimney 2 is such that, as shown in FIGS. 1 to 3 and FIG. 6(b), the chimney 2 is connected to one end opening 21 of the inner cylinder 20 and the other end opening 22 is closed. However, it is not necessarily limited to this. As shown in FIG. 6(a), one end opening 21 and the other end opening 22 of the outer cylinder 10 may be respectively connected to the chimney 2, or, as shown in FIG. 6(c), one end opening 21 of the inner cylinder 20 may be closed and the chimney 2 may be connected to the other end opening 22, and it may be changed as appropriate without any problem. Furthermore, in the above-described embodiment, the outer cylinder 10 and the inner cylinder 20 are erected on the bottom wall portion 4, but it is not necessarily limited to this. For example, it may be appropriately changed, such as being installed between the side wall portions 6.

[0034] Also, in the above-described embodiment, the air circulation space Ab and the air outlet 40 are provided in the bottom wall portion 4, but it is not necessarily limited to this. They may be provided in both the bottom wall portion 4 and the side wall portion 6, or may be provided in the side wall portion 6 (see FIG. 6), and may be appropriately changed without any problem. 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-described shape. For example, it may be formed in any shape, such as by continuously connecting the bottom wall portion 4, the ceiling wall portion 5, and the side wall portion 6 to form a rectangular shape or a cylindrical shape. Also, the opening 8 opened and closed by the opening and closing body 7 may be provided not only in the side wall portion 6 but also in the ceiling wall portion 5.

[0035] 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 thereto, and as long as the heat exchanger K is made of metal, any material such as stone or ceramic may be used as long as it is heat resistant. In addition, in the above embodiment, the solid fuel W is not limited to firewood, and may 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 these many modifications are included in the scope of the present invention. [Explanation of symbols]

[0036] S stove W solid fuel 1 Main unit E. Combustion chamber K Heat exchange section Ka storage area 2. Chimney 3 legged body 4 Bottom wall 4a Lower wall board 4b Upper wall plate 5 Ceiling wall section 6 Side wall 7 Opening and closing body 8 Openings 10 Outer cylinder 11 Inlet 12 Outlet 13 One-sided opening 14 Other opening 15 Upper through hole 16 Lower through hole 20 Inner cylinder 21 One end open 22 Other end opening 23 Occlusion plate 24 Connecting pipe 30 Body 31 External opening 32 Inner opening L1~L5 Tube Rows G Gas passage space Aa Air passage space Ab Air circulation space 40 Air outlet 41 Edge 42 End 50 Support plate

Claims

1. 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.

2. 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.

3. 3. The stove of claim 2, wherein the bottom wall portion is formed in two layers by comprising 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 opening is formed in the ceiling wall portion through which one opening of the outer tube faces outside the main body, a lower through opening is formed in the upper wall plate of the bottom wall portion through which the other opening of the outer tube faces into the air circulation space, and the air outlet is formed between the edge of the upper wall plate on the side wall portion side and the side wall portion.

4. A stove as described in claim 3, characterized in that the main body has a front and a back, the opening is provided in the front side wall of the main body, the outer tube and the inner tube are provided in contact with or adjacent to the back side wall, and the air outlet is formed between the edge of the upper wall panel on the front side and the front side wall.

5. 5. The stove according to claim 4, wherein an end portion of the upper wall panel forming the air outlet is curved and raised so as to be convex toward the front when viewed from the side.

6. 6. The stove according to claim 5, wherein the upper wall plate is provided with a plurality of support plates at predetermined intervals, each of which is capable of supporting solid fuel and has a surface direction aligned in a vertical direction.

7. A stove as described in any one of claims 1 to 6, characterized in that the outer tube and inner tube are formed cylindrically and arranged so that the center lines of the outer tube and inner tube are coaxial, and the multiple tube bodies are each arranged so that their axis intersects and is perpendicular to the center lines of the outer tube and inner tube.

8. A stove as described in claim 7, characterized in that a plurality of the tubes are arranged at equal intervals along the center line direction of the outer tube and the inner tube to form a tube row, and the tube rows are arranged in a plurality of rows at required intervals along the circumferential direction of the outer tube and the inner tube.

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