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 fuels such as firewood and is mainly used for heating, and particularly to a stove that preheats and supplies combustion air necessary for burning solid fuels.

Background Art

[0002] Conventionally, as this type of stove, for example, the one described in Japanese Patent Application Laid-Open No. 2010-133697 (Patent Document 1) is known. This stove includes a main body having a combustion chamber for burning solid fuels such as firewood and pellets. Combustion air is supplied to the combustion chamber of the main body to burn the solid fuel, generate combustion gas, and exhaust it from the chimney. The main body is provided with a heat exchange section that performs heat exchange between the combustion air and the combustion gas to warm and preheat the combustion air.

[0003] This heat exchange section has a housing portion accommodated in the combustion chamber, a metal outer cylinder having an inlet through which combustion air flows in from the outside of the main body and an outlet through which combustion air flows out 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, and the outer surface of which is spaced from the inner surface of the outer cylinder and is inserted into the outer cylinder. The outer cylinder and the inner cylinder form a double cylinder portion. One end opening of the inner cylinder is connected to the chimney, combustion air is supplied to the combustion chamber through the outer cylinder, in this combustion chamber, solid fuel is burned to generate combustion gas, and then it is exhausted from the chimney through the inner cylinder. In the combustion of this solid fuel, heat exchange between the combustion air and the combustion gas is performed in the double cylinder portion formed by the outer cylinder and the inner cylinder of the heat exchange section to warm and preheat the combustion air and improve the combustion efficiency of the solid fuel.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in the conventional stove described above, in the double cylinder portion formed by the outer cylinder and the inner cylinder of the heat exchange portion, heat exchange is performed between the combustion air and the combustion gas to warm and preheat the combustion air, thereby improving the combustion efficiency of solid fuel. However, since the combustion air only contacts 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 view of such problems, and an object thereof is 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 Problems

[0006] To achieve such an object, the stove of the present invention includes a main body having a combustion chamber for burning solid fuel, supplies combustion air to the combustion chamber of the main body to burn the solid fuel to generate combustion gas and exhaust it from a chimney, and includes a heat exchange portion that performs heat exchange between the combustion air and the combustion gas to warm the combustion air. In the stove, The heat exchange section is configured to include a metal outer cylinder having a housing portion accommodated in the combustion chamber, an inlet through which combustion air flows in from the outside of the main body, and an outlet through which the combustion air flows out 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, with the outer surface being spaced apart from the inner surface of the outer cylinder and inserted into the outer cylinder. A plurality of metal tubes are installed with a required interval between the wall portion constituting the housing portion of the outer cylinder and the wall portion corresponding to the inner cylinder. An outer opening that communicates with the inside of the tube and opens to the combustion chamber is formed on the outer surface of the outer cylinder, and an inner opening that communicates with the inside of the tube and opens to the inside of the inner cylinder is formed on the inner surface of the inner cylinder. One end opening and / or the other end opening of the inner cylinder is connected to the chimney. When either one of the one end opening and the other end opening of the inner cylinder is connected to the chimney, the other of the one end opening and 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 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.

[0007] Here, a plurality of tubes are provided at a required interval, and the required interval and the number thereof may be determined as appropriate. Also, the connection mode between the inner cylinder and the chimney may be, as shown in FIG. 6(a), connecting the one end opening and the other end opening of the inner cylinder to the chimney respectively, or, as shown in FIG. 6(b), connecting the chimney to the one end opening of the inner cylinder while closing the other end opening, or, as shown in FIG. 6(c), closing the one end opening of the inner cylinder while connecting the chimney to the other end opening. Any of these modes can be adopted and changed as appropriate.

[0008] As a result, during the combustion of solid fuel, combustion air flows in from the inlet of the outer cylinder of the heat exchange section, flows out from the outlet, and is supplied into the combustion chamber, where the solid fuel is combusted. The combustion gas generated by the combustion of this solid fuel enters the inner cylinder through the pipe body from the outer opening formed in the outer cylinder, passes through the inner opening, and is exhausted from the chimney through the inner cylinder. That is, the combustion gas passes through the gas passage space of the heat exchange section and is exhausted from the chimney, and the combustion air passes through the air passage space of the heat exchange section and is supplied to the combustion chamber. In this heat exchange section, heat exchange between the combustion air and the combustion gas takes place. Therefore, the combustion air is heated and preheated. In this case, the combustion air not only contacts the inner surface of the outer cylinder and the inner surface of the inner cylinder in the air passage space, but also contacts the surface of the pipe body. As a result, compared with the prior art, the contact area with the part heated by the combustion gas becomes larger. Therefore, the heat exchange efficiency can be improved, and thus the combustion efficiency of the solid fuel can be improved. Also, since the combustion gas enters the inner cylinder through a plurality of pipe bodies, the residence time becomes longer accordingly, and secondary combustion in the gas passage space can be surely carried out, and the combustion efficiency can also be improved in this regard.

[0009] Then, if necessary, the above-mentioned main body is configured to include a metal bottom wall portion, a ceiling wall portion, and side wall portions that surround and form the above-mentioned combustion chamber, and an opening that can be opened and closed by an opening and closing body for putting solid fuel into the combustion chamber is provided in the above-mentioned side wall portion and / or ceiling wall portion. The bottom wall portion and / or side wall portion of the above-mentioned main body is formed by doubling the wall plates to form an air circulation space in which combustion air can flow between the double wall plates. The above-mentioned outer cylinder is formed in a cylindrical shape having one opening and the other opening, and the outer cylinder is provided such that one opening faces the outside of the above-mentioned main body and the other opening faces the above-mentioned air circulation space. The above-mentioned inlet is constituted by one opening, and the above-mentioned outlet is constituted by the other opening. A blowout port for blowing the combustion air from the above-mentioned air circulation space into the above-mentioned combustion chamber is formed in the bottom wall portion and / or side wall portion of the main body that constitutes the above-mentioned air circulation 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 to erect the outer cylinder on the upper wall plate, an upper through-hole through which one opening of the outer cylinder faces outward 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 bottom to top, the support of the solid fuel against the bottom wall portion can be stabilized and the fuel 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 performed.

[0013] Furthermore, if necessary, an end portion of the upper wall plate forming the above air outlet is curved and raised so as to be convex on the front side when viewed from the side. Since the combustion air from the air outlet is guided between the end portion of the curved upper wall plate and the side wall portion and supplied into the combustion chamber, it becomes difficult for the air outlet to be blocked by the solid fuel, and the combustion of the solid fuel can be made more reliable.

[0014] Furthermore, if necessary, a plurality of support plates capable of supporting the solid fuel and having a surface direction along the vertical direction are provided on the upper wall plate at predetermined intervals. Since the solid fuel is placed on the upper edge of the comb-shaped support plate, it becomes easier for the combustion air to be supplied from below, and in this respect as well, the combustion of the solid fuel can be made more reliable.

[0015] Moreover, if necessary, the outer cylinder and the inner cylinder are formed in a cylindrical shape, arranged such that the center lines of the outer cylinder and the inner cylinder are coaxial, and the plurality of tubular bodies are provided such that their axes intersect and are perpendicular to the center lines of the outer cylinder and the inner cylinder. As a result, the combustion gas passing through each tubular body converges and concentrates in the central portion of the inner cylinder, so that the combustion temperature is effectively increased, and the combustion efficiency can be further improved. In this case, it is effective to provide a plurality of the tubular bodies at equal intervals along the center line direction of the outer cylinder and the inner cylinder to form a tubular body row, and to provide a plurality of rows of the tubular body row at a required interval along the circumferential direction of the outer cylinder and the inner cylinder. As a result, since the tubular bodies are arranged in a matrix around the inner cylinder, the combustion air passing through the air passage space comes into contact with the outer tube evenly, and thus the heat exchange efficiency with the combustion gas can be improved. Further, since the outer openings communicating with the tubular bodies are formed in a matrix on the outer surface of the outer cylinder, the combustion gas is uniformly guided from around the outer cylinder into the inner cylinder, and the flow of the combustion gas is stabilized. In this respect as well, the combustion of the solid fuel can be made more reliable.

Advantages of the Invention

[0016] According to the present invention, in the heat exchange section, heat exchange between combustion air and combustion gas is performed. In this case, the combustion air not only contacts the inner surface of the outer cylinder and the inner surface of the inner cylinder in the air passage space, but also contacts the surface of the tube body. Therefore, compared with the prior art, the contact area with the portion heated by the combustion gas increases, and thus the heat exchange efficiency can be improved, and accordingly, the combustion efficiency of the solid fuel can be improved. Further, since the combustion gas enters the inner cylinder through a plurality of tube bodies, the residence time is lengthened accordingly, and secondary combustion in the gas passage space can be surely performed, and the combustion efficiency can also be improved in this respect.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0018] Hereinafter, a stove according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. As shown in FIGS. 1 to 5, the stove S according to the embodiment of the present invention includes a main body 1 having a combustion chamber E for burning solid fuel W such as firewood. Combustion air is supplied to the combustion chamber E of the main body 1 to burn the solid fuel W to generate combustion gas and exhaust it from the chimney 2. Legs 3 for supporting the main body 1 are provided on the main body 1.

[0019] Specifically, the main body 1 includes a bottom wall portion 4, a ceiling wall portion 5, and side wall portions 6 made of metal such as iron that surround the combustion chamber E, and is configured to have a front and a back. The bottom wall portion 4 and the ceiling wall portion 5 are formed in a semicircular shape when viewed from above, and the back side is curved. The chimney 2 is erected at the center of the back on the upper side of the ceiling wall portion 5. The side wall portions 6 are provided between the bottom wall portion 4 and the ceiling wall portion 5. The side wall portions 6 on the back side are curved following the curved shapes of the bottom wall portion 4 and the ceiling wall portion 5, and the side wall portions 6 on the front side are formed in a flat plate shape. 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 is formed in the side wall portion 6 and / or the ceiling wall portion 5 (in the embodiment, the side wall portion 6 on the front side). The opening and closing body 7 is composed of a door that can be opened and closed by a hinge.

[0020] The stove S according to the embodiment is provided with a heat exchange portion K that performs heat exchange between the combustion air and the combustion gas to warm the combustion air. The heat exchange portion K has a housing portion Ka housed in the combustion chamber E, an outer cylinder 10 made of metal such as iron having an inlet 11 for allowing the combustion air to flow in from the outside of the main body 1 and an outlet 12 for allowing the combustion air to flow out to the combustion chamber E side, and an inner cylinder 20 made of metal such as iron having one end opening 21 located on the inlet 11 side of the outer cylinder 10 and the other end opening 22 located on the outlet 12 side of the outer cylinder 10, and the outer surface is spaced from the inner surface of the outer cylinder 10 and inserted into the outer cylinder 10. The outer cylinder 10 and the inner cylinder 20 are formed in a cylindrical shape, and the center lines P of the outer cylinder 10 and the inner cylinder 20 are arranged coaxially.

[0021] In the heat exchange section K, a plurality of metal tubes 30 are installed by welding or the like with a required interval between the wall portion constituting the accommodation part Ka of the outer cylinder 10 and the wall portion corresponding thereto of the inner cylinder 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 cylinder 10, and an inner opening 32 that communicates with the inside of the tube 30 and opens to the inside of the inner cylinder 20 is formed on the inner surface of the inner cylinder 20. Each of these plurality of tubes 30 is provided such that its axis Q intersects and is orthogonal to the center line P of the outer cylinder 10 and the inner cylinder 20. Further, a plurality of tubes 30 are provided at equal intervals along the direction of the center line P of the outer cylinder 10 and the inner cylinder 20, and a tube row of the tubes 30 is formed. This tube row is provided in a plurality of rows at a required interval along the circumferential direction of the outer cylinder 10 and the inner cylinder 20. In the embodiment, the tube rows (L1 to L5) are composed of five tubes 30 and are provided in a total of five rows. As shown in FIG. 4, the interval between adjacent tube rows (L1 to L5) is provided in two rows at an interval of θ (60°) to the left and right with respect to one tube row (L1: the tube row in which the later-described outer opening 31 faces the front).

[0022] And one end opening 21 and / or the other end opening 22 of the inner cylinder 20 is connected to the chimney 2. 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 closing 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 closing 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 closing side plate 23 can be adopted. In the embodiment, as shown in FIGS. 1 to 3, a mode (the mode of FIG. 6(b)) in which the one end opening 21 of the inner cylinder 20 is connected to the chimney 2 via the connecting pipe 24 and the other end opening 22 is closed is adopted.

[0023] Accordingly, in the embodiment, 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 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 and from the inlet 11 to the outlet 12 is configured as an air passage space Aa through which combustion air can pass.

[0024] Further, the bottom wall portion 4 and / or the side wall portion 6 (the bottom wall portion 4 in the embodiment) of the main body 1 is formed by doubling wall plates, and an air flow space Ab through which combustion air can flow is formed between the double wall plates. That is, the bottom wall portion 4 includes a lower wall plate 4a and an upper wall plate 4b provided at a predetermined interval above the lower wall plate 4a, and is formed in a double layer, 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 portion K, the outer cylinder 10 is formed in a cylindrical shape having one opening 13 and the other opening 14, the one opening 13 faces the outside of the main body 1, and the other opening 14 faces the air flow space Ab. The inlet 11 is constituted by the one opening 13, and the outlet 12 is constituted 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. An upper through hole 15 through which the one opening 13 of the outer cylinder 10 faces the outside of the main body 1 is formed in the ceiling wall portion 5, and a lower through hole 16 through which the other opening 14 of the outer cylinder 10 faces the air flow space Ab is formed in the upper wall plate 4b of the bottom wall portion 4. The one opening 13 side of the outer cylinder 10 slightly protrudes from the ceiling wall portion 5, and the outer peripheral portion thereof is welded and fixed to the upper through hole 15 of the ceiling wall portion 5, while the edge portion of the other opening 14 of the outer cylinder 10 is welded and fixed to the lower through hole 16 of the upper wall plate 4b of the bottom wall portion 4. Further, the outer cylinder 10 is provided such that the outer opening 31 of the tube body row L1 faces the front.

[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 by the outer cylinder 10 via the tube body 30, and the chimney 2 is supported by the inner cylinder 20 via the connection pipe 24. Therefore, the inner cylinder 20 and the chimney 2 can be reliably supported by the main body 1.

[0027] Furthermore, an air outlet 40 for blowing combustion air from the air circulation space Ab into the combustion chamber E is formed in the bottom wall portion 4 and / or the side wall portion 6 (the bottom wall portion 4 in the embodiment) of the main body 1 that constitutes the air circulation space Ab. The air outlet 40 is formed between the edge 41 on the side wall portion 6 side of the upper wall plate 4b and the side wall portion 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 portion 6 on the front side. Also, as shown in FIG. 3, an end portion 42 having the edge 41 of the upper wall plate 4b that forms the air outlet 40 is curved and raised so as to be convex toward the front side when viewed from the side.

[0028] Furthermore, a plurality of support plates 50 that can support the solid fuel W and whose surface directions are along the vertical direction are provided on the upper wall plate 4b at predetermined intervals.

[0029] 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 / closing body 7 is opened, and the solid fuel W is put into the combustion chamber E from the opening 8 and ignited. During the combustion of this solid fuel W, combustion air flows in from the inlet 11 of the outer cylinder 10 of the heat exchange section K and flows out into the air circulation space Ab from the outlet 12 of the outer cylinder 10, and is supplied into the combustion chamber E from the air outlet 40. The combustion gas generated by the combustion of this solid fuel W enters the inner cylinder 20 through the outer opening 31 formed in the outer cylinder 10, passes through the pipe body 30, and passes 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 exchange section K and is exhausted from the chimney 2, and the combustion air passes through the air passage space Aa and the air circulation space Ab of the heat exchange section K and is supplied to the combustion chamber E. In this heat exchange section K, heat exchange between the combustion air and the combustion gas is performed. Therefore, the combustion air is heated and preheated. In this case, the combustion air not only contacts the inner surface of the outer cylinder 10 and the inner surface of the inner cylinder 20 in the air passage space Aa, but also contacts the surface of the pipe body 30. Therefore, compared with the conventional case, the contact area with the portion heated by the combustion gas becomes larger, and thus the heat exchange efficiency can be improved, and accordingly, the combustion efficiency of the solid fuel W can be improved. Further, since the combustion gas enters the inner cylinder 20 through the plurality of pipe bodies 30, the residence time becomes longer, and secondary combustion in the gas passage space G can be surely performed, and the combustion efficiency can also be improved in this respect.

[0030] In addition, since the plurality of tubular bodies 30 are each provided such that their axis Q intersects and is orthogonal to the center line P of the outer cylinder 10 and the inner cylinder 20, the combustion gas passing through each tubular body 30 converges and concentrates at the central portion of the inner cylinder 20. Therefore, the combustion temperature effectively increases, and the combustion efficiency can be further improved. Furthermore, since a plurality of rows of the tubular bodies 30 of the tubular body rows (L1 to L5) are provided at required intervals along the circumferential direction of the outer cylinder 10 and the inner cylinder 20, the tubular bodies 30 are arranged in a matrix around the inner cylinder 20. Therefore, the combustion air passing through the air passage space Aa contacts the outer tube evenly, and thus the heat exchange efficiency with the combustion gas can be improved. In addition, since the outer openings 31 communicating with the tubular bodies 30 are formed in a matrix on the outer surface of the outer cylinder 10, the combustion gas is evenly guided from around the outer cylinder 10 into the inner cylinder 20, and the flow of the combustion gas is stabilized. Also in this regard, the combustion of the solid fuel W can be made more reliable.

[0031] Furthermore, in this case, since the air flow space Ab is formed in the bottom wall portion 4 and / or the side wall portion 6 (the bottom wall portion 4 in the embodiment) of the main body 1 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 portion 4 and / or the side wall portion 6 (the bottom wall portion 4 in the embodiment) of the main body 1, compared with the case where the air outlet 40 is simply constituted by the other opening 14 of the outer cylinder 10, the air outlet 40 can be formed at a place where the solid fuel W is easy to burn, and thus the combustion efficiency can be improved accordingly. In the embodiment, since the air outlet 40 is formed between the edge 41 of the upper wall plate 4b on the front side and the side wall portion 6 on the front side, the combustion air is supplied from the front side to the back side, so that the combustion of the solid fuel W can be surely performed. In addition, since the air outlet 40 is formed along the side wall portion 6 and the combustion air blows out from the bottom to the top, the support of the solid fuel W on the bottom wall portion 4 can be stabilized, and it can be made easier to burn. Also in this regard, the combustion efficiency can 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 made more reliable. 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 made more reliable.

[0033] In addition, in the above 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 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. Furthermore, in the above 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 erected between the side wall portions 6.

[0034] Also, in the above 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. 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. For example, it may be formed in any shape, such as by 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 portion 4, the ceiling wall portion 5, and the side wall portion 6 are made of metal, but it is not necessarily limited thereto. If the heat exchange portion K is made of metal, it may be formed of any material such as stone or ceramic as long as it has heat resistance. Also, in the above embodiment, the solid fuel W is not limited to firewood, and may be any of peat, coal, lignite, bituminous coal, anthracite, coke, briquettes, wood pellets, sawdust briquettes, sawdust, charcoal, wax, and various solid fuels. In short, those skilled in the art can easily make many changes to these exemplary embodiments without substantially departing from the novel teachings and effects of the present invention, and many of these changes are included in the scope of the present invention.

Explanation of Reference Numerals

[0036] S Stove W Solid fuel 1 Main body E Combustion chamber K Heat exchange portion Ka Accommodation portion 2 Chimney 3 Legs 4 Bottom wall portion 4a Lower wall plate 4b Upper wall plate 5 Ceiling wall portion 6 Side wall portion 7 Opening / closing body 8 Opening 10 Outer cylinder 11 Inlet 12 Outlet 13 One opening 14 The other opening 15 Upper through-hole 16 Lower through-hole 20 Inner cylinder 21 One end opening 22 The other end opening 23 Closing plate 24 Connecting pipe 30 Pipe body 31 Outer opening 32 Inner opening L1~L5 Pipe body row 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, and a heat exchanger that supplies combustion air to the combustion chamber of the main body to combust the solid fuel, generating combustion gas and exhausting it from a chimney, and that exchanges heat between the combustion air and the combustion gas to heat the combustion air, The heat exchange unit 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 combustion air toward the combustion chamber, 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 gap between the inner surface of the outer cylinder, a plurality of metal pipes 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 outer openings communicating with the inside of the pipes and opening into the combustion chamber are 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 metal bottom wall portion, a ceiling wall portion, and a side wall portion that surround the combustion chamber, and an opening that can be opened and closed by an opening / closing body is provided in the side wall portion and / or the ceiling wall portion to introduce solid fuel into the combustion chamber; The bottom wall and / or the side wall of the main body are double-walled to form an air flow space between the double wall plates through which combustion air can flow; The outer cylinder is formed into a cylindrical shape having one opening and another 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 that forms the air circulation space, for blowing combustion air from the air circulation space into the combustion chamber.

3. The bottom wall portion is formed in a double layer with a lower wall plate and an upper wall plate provided at a predetermined interval above the lower wall plate. An 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 to erect the outer cylinder on the upper wall plate. An upper through hole through which one opening of the outer cylinder faces outward 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. The stove according to claim 2, wherein the air outlet is formed between an edge of the upper wall plate on the side wall portion side and the side wall portion.

4. The main body is configured to have a front surface and a back surface. The opening is provided in a side wall portion on the front surface of the main body. The outer cylinder and the inner cylinder are provided in contact with or close to a side wall portion on the back surface. The stove according to claim 3, wherein the air outlet is formed between an edge of the upper wall plate on the front side and a side wall portion on the front side.

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

6. The stove according to claim 5, wherein a plurality of support plates capable of supporting solid fuel and having a surface direction along the vertical direction are provided on the upper wall plate at a predetermined interval.

7. The outer cylinder and the inner cylinder are formed in a cylindrical shape and arranged such that their center lines are coaxial. The plurality of pipe bodies are provided such that their axes intersect and are orthogonal to the center lines of the outer cylinder and the inner cylinder, respectively. The stove according to any one of claims 1 to 6.

8. The stove according to claim 7, wherein a plurality of the pipe bodies are provided at equal intervals along the center line direction of the outer cylinder and the inner cylinder to form a pipe body row, and a plurality of the pipe body rows are provided at a required interval along the circumferential direction of the outer cylinder and the inner cylinder.

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