JP2013148263A - Stove - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve efficiency of combustion in a secondary combustion chamber by minimizing a flow resistance of combustion gas to produce a swirl flow of combustion gas, while preventing unburnt gas from being mixed with exhaust gas in the secondary combustion chamber.SOLUTION: A stove includes a primary combustion chamber 10A for burning a solid fuel W; a secondary combustion chamber 20A for burning combustion gas led out of the primary combustion chamber 10A through a conduction path 30A; and an exhaust path 40A exhausting exhaust gas generated in a secondary combustion chamber 20A. The secondary combustion chamber 20A is formed in inverted truncated cone shape, and the conduction path 30A is formed such that combustion gas flows in along a circumferential direction centering on a center axis of the secondary combustion chamber 20A. A core member 50 formed in inverted truncated cone shape centering on the center axis of the secondary combustion chamber 20A to form a guide passage 51 for guiding combustion gas between itself and a wall surface of the secondary combustion chamber 20A is provided in the secondary combustion chamber 20A.

Description

  The present invention relates to a stove that burns solid fuel such as firewood and waste wood, and in particular, includes a secondary combustion chamber that further burns combustion gas from the primary combustion chamber and improves combustion efficiency in the secondary combustion chamber. About the stove.

Conventionally, a primary combustion chamber that has an openable and closable inlet for charging solid fuel such as soot as a stove and burns the solid fuel input from the inlet, and this primary combustion is provided horizontally in the primary combustion chamber There is known one having a secondary combustion chamber for burning combustion gas from a chamber and a chimney for exhausting exhaust gas generated in the secondary combustion chamber (for example, Utility Model Registration No. 3152010 (Patent Document 1)). )reference).
In this type of stove, various devices are made in order to improve the combustion efficiency in the secondary combustion chamber. For example, in the stove described in Patent Document 1, the primary combustion chamber and the secondary combustion chamber are provided. A partition wall having a large number of small holes through which combustion gas passes is provided between the combustion chamber and the combustion chamber.

Further, as a technique for improving the combustion efficiency in the secondary combustion chamber, although not the stove technique, the incinerator technique includes, for example, a primary combustion chamber (not shown) as shown in FIG. An opening 102 is formed on the lower side of the secondary combustion chamber 100 so that the combustion gas from the gas flows into the secondary combustion chamber 100 along the circumferential direction centering on the central axis 101 of the secondary combustion chamber 100, and combustion There is one in which gas is swirled in the secondary combustion chamber 100 and exhausted from the upper exhaust port 102 (see Japanese Patent Laid-Open No. 2000-18534 (Patent Document 2)).
Similarly, as shown in FIG. 9, for example, as shown in FIG. 9, the secondary combustion chamber 100 is provided with a fixed shaft 105 along its axis, and a spiral swirl blade 106 is provided on the fixed shaft 105. A helical flow path 107 of combustion gas is provided. The swirl vane 106 is configured such that no exhaust gas bypass (short path) occurs between the spiral flow paths 107 (see Japanese Patent Laid-Open No. 2001-330222 (Patent Document 3)). In FIG. 9, reference numeral 108 denotes a gas burner for heating the combustion gas.

Utility Model Registration No.3152010 JP 2000-18534 A JP 2001-330222 A

By the way, in the stove described in Patent Document 1, a partition wall having a large number of small holes through which combustion gas passes is provided between the primary combustion chamber and the secondary combustion chamber. This may increase the flow resistance, and rather reduce the combustion efficiency of the combustion gas. In order to solve this, for example, the chimney is lengthened or a suction fan is separately provided to increase the suction force of the combustion gas. However, the structure becomes complicated and the cost is increased.
Although the application of the technology of the combustion furnace described in Patent Document 2 shown in FIG. 8 is also conceivable, as shown in FIG. 8, the secondary combustion chamber 100 is wide even if a swirl flow is generated. There is a problem in that the flow of combustion gas is disturbed, and unburned gas and exhaust gas are mixed to impair combustion efficiency.

  Furthermore, although the application of the technology of the combustion furnace described in Patent Document 3 shown in FIG. 9 is also conceivable, as shown in FIG. 9, the exhaust gas burns through the spiral flow path 107 so as not to cause a short path. Although there is no situation where unburned gas and exhaust gas are mixed, flow resistance is increased, so that the combustion efficiency of the combustion gas may be lowered rather than the above stove. In order to solve this, a gas burner 108 (FIG. 9) must be provided, or a suction fan must be provided separately to increase the suction force of the combustion gas. There is a problem of becoming high.

  The present invention has been made in view of such a problem, and the flow resistance of the combustion gas is reduced as much as possible so that the unburned gas and the exhaust gas are not mixed in the secondary combustion chamber. An object of the present invention is to provide a stove capable of generating a swirl flow and improving combustion efficiency in a secondary combustion chamber.

In order to achieve such an object, the stove of the present invention has an openable and closable inlet for charging solid fuel, a primary combustion chamber for burning the solid fuel input from the inlet, and the primary combustion chamber. A secondary combustion chamber that is disposed in the horizontal direction and burns combustion gas from the primary combustion chamber, and the combustion gas of the primary combustion chamber is introduced from an inlet provided on the lower side of the primary combustion chamber and the secondary combustion chamber is introduced. A conduction path led out from the outlet provided on the lower side of the combustion chamber, and an exhaust path for exhausting the exhaust gas generated in the secondary combustion chamber from the outlet through the exhaust inlet provided on the upper side of the secondary combustion chamber In the stove
At least the outlet and the outlet of the secondary combustion chamber are formed in an inverted truncated cone shape, and the combustion gas from the outlet is centered on the central axis of the secondary combustion chamber in the conduction path. It is formed so as to flow into the secondary combustion chamber along the circumferential direction, and is formed in an inverted conical shape or an inverted frustoconical shape centering on the central axis of the secondary combustion chamber in the secondary combustion chamber. A core member is provided between the wall of the secondary combustion chamber and a guide member that forms a guide passage for guiding the combustion gas flowing in from the outlet of the conduction path. A chimney is appropriately provided at the exhaust port.

  Thus, when the solid fuel is burned, the solid fuel is charged into the primary combustion chamber from the charging port and ignited. Solid fuel burns in the primary combustion chamber, combustion gas is introduced into the introduction port of the conduction path, is led out from the outlet to the secondary combustion chamber, and flows into the secondary combustion chamber. The conduction path is formed so that the combustion gas from the outlet port flows into the secondary combustion chamber along the circumferential direction centering on the central axis of the secondary combustion chamber. Will rise. In this turning and ascending process, the unburned gas further burns and becomes exhaust gas, which is exhausted through the exhaust port through the exhaust port.

In this case, in the secondary combustion chamber, the secondary combustion chamber is formed in an inverted cone shape, and a core member formed in an inverted cone shape or an inverted truncated cone shape is provided at the center thereof, and the wall surface of the secondary combustion chamber is Since the guide passage for guiding the combustion gas is formed between the core member and the core member, the combustion gas flowing in from the outlet of the conduction path is guided by the guide passage. For this reason, the combustion gas swirls and rises along the wall of the secondary combustion chamber, preventing the flow from being disturbed and preventing the unburned gas and exhaust gas from mixing and impairing the combustion efficiency. Can do.
In addition, since the member that obstructs the flow of the combustion gas does not protrude from the wall of the secondary combustion chamber that constitutes the guide passage, the flow resistance of the combustion gas does not increase, and the combustion gas can be smoothly swirled and raised. Can be done.

In particular, since the secondary combustion chamber is formed in the shape of an inverted truncated cone, the circumferential length becomes longer as it rises, so the flow velocity decreases and the centrifugal force drops, so a pressure difference occurs between the upper and lower sides. An upward pulling force is generated, and the combustion gas can be swirled and raised smoothly also in this respect.
In other words, the chimney length is increased, a separate burner is not provided, or a suction fan is not required, and a simple structure is provided in which a core member is provided. Unburned gas and exhaust gas are mixed in the secondary combustion chamber. In addition, the flow resistance of the combustion gas can be reduced as much as possible to generate a swirling flow of the combustion gas, and the combustion efficiency in the secondary combustion chamber can be improved.

  And as needed, it is set as the structure which provided in the outer peripheral surface of the said core member the spiral blade which is spaced apart from the wall surface of the said secondary combustion chamber, and centering | focusing on the central axis of the said core member. Although the combustion gas is guided by the guide passage, it is also guided by the spiral blade and swirls and rises, so that it can be burned without further disturbing the flow. In this case, the combustion gas rises along the wall of the secondary combustion chamber due to the centrifugal force, so that the flow resistance due to the spiral blade does not increase so much, so that the situation of hindering the flow is prevented.

  If necessary, the exhaust path is formed so that the exhaust gas from the secondary combustion chamber flows out from the exhaust port substantially along the swirl direction. Thereby, since the exhaust gas generated in the secondary combustion chamber flows out substantially along the swirl direction, the swirl force of the swirl flow of the combustion gas can be increased, the swirl flow becomes even smoother, and the secondary flow The combustion efficiency in the combustion chamber can be improved.

  Further, if necessary, the outlet of the conduction path and the exhaust inlet of the exhaust path are orthogonal to the connection connecting the central axis of the primary combustion chamber and the central axis of the secondary combustion chamber when viewed from above. The configuration is such that it is positioned closer to the central axis of the primary combustion chamber than the orthogonal line passing through the central axis of the secondary combustion chamber. As a result, if the outlet of the conduction path and the exhaust outlet of the exhaust path are across the orthogonal line passing through the central axis of the secondary combustion chamber and are at positions facing each other, the swirling flow of the combustion gas is Combustion gas may flow out as a shortcut without being able to rotate, but because the outlet of the conduction path and the outlet of the exhaust path are located on the same side with respect to the orthogonal line, the swirling flow is Since the combustion gas flows out due to the rotation, the swirl force of the swirl flow of the combustion gas can be increased also in this point, the swirl flow becomes smoother, and the combustion efficiency in the secondary combustion chamber is improved. Improvements can be made.

  In addition, if necessary, the first furnace body having the primary combustion chamber, the second furnace body having the secondary combustion chamber, and the conductor having the conduction path provided between the first furnace body and the second furnace body. A metal body having an exhaust passage body connected to the passage body and the second furnace body and having the exhaust passage is provided, and a metal receiver for receiving heat from the bottom portion is provided below the bottom portion of the main body. It is set as the structure which provided the board. Thereby, the heat from the main body does not reach the floor directly, but can be received and diffused by the receiving plate, and the heat radiation efficiency is improved.

  In this case, it is effective to project a metal heat radiation plate from the main body. Since the heat radiation plate can also dissipate heat, the heat radiation efficiency can be improved also in this respect.

According to the present invention, in the secondary combustion chamber, the secondary combustion chamber is formed in an inverted cone shape, and a core member formed in an inverted cone shape or an inverted truncated cone shape is provided at the center thereof, and the secondary combustion chamber is provided. Since the guide passage for guiding the combustion gas is formed between the wall surface and the core member, the combustion gas flowing in from the outlet of the conduction passage is guided by this guide passage. For this reason, the combustion gas swirls and rises along the wall of the secondary combustion chamber, preventing the flow from being disturbed and preventing the unburned gas and exhaust gas from mixing and impairing the combustion efficiency. Can do.
In addition, since the member that obstructs the flow of the combustion gas does not protrude from the wall of the secondary combustion chamber that constitutes the guide passage, the flow resistance of the combustion gas does not increase, and the combustion gas can be smoothly swirled and raised. Can be done.

In particular, since the secondary combustion chamber is formed in the shape of an inverted truncated cone, the circumferential length becomes longer as it rises, so the flow velocity decreases and the centrifugal force drops, so a pressure difference occurs between the upper and lower sides. An upward pulling force is generated, and the combustion gas can be swirled and raised smoothly also in this respect.
In other words, the chimney length is increased, a separate burner is not provided, or a suction fan is not required, and a simple structure is provided in which a core member is provided. Unburned gas and exhaust gas are mixed in the secondary combustion chamber. In addition, the flow resistance of the combustion gas can be reduced as much as possible to generate a swirling flow of the combustion gas, and the combustion efficiency in the secondary combustion chamber can be improved.

It is a section perspective view showing the stove concerning an embodiment of the invention. 1 is an overall perspective view showing a stove according to an embodiment of the present invention. It is a front view which shows the stove concerning embodiment of this invention. It is a top view which shows the stove concerning embodiment of this invention. It is side surface fragmentary sectional view which shows the stove concerning embodiment of this invention. It is a plane sectional view showing a stove concerning an embodiment of the invention. It is sectional drawing which shows another example of a core member in the stove concerning embodiment of this invention. It is a figure which shows an example of a secondary combustion chamber in the conventional combustion furnace. It is a figure which shows the other example of a secondary combustion chamber in the conventional combustion furnace.

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 6, the stove S according to the embodiment of the present invention burns solid fuel W such as firewood and waste wood, and has a main body 1 formed of a metal plate such as iron. It is prepared for. The main body 1 is connected to the first furnace body 10, the second furnace body 20 attached to the first furnace body 10, the conduction path body 30 and the second furnace body 20 installed between the first furnace body 10 and the second furnace body 20. The exhaust path body 40 is provided.

  The first furnace body 10 is provided with a primary combustion chamber 10 </ b> A that has an openable / closable inlet 11 for introducing solid fuel W and burns the solid fuel W introduced from the inlet 11. The second furnace body 20 is provided with a secondary combustion chamber 20A that is disposed side by side with the primary combustion chamber 10A in the horizontal direction and burns the combustion gas from the primary combustion chamber 10A. In the conduction path body 30, the combustion gas in the primary combustion chamber 10 </ b> A is introduced from an inlet 31 provided on the lower side of the primary combustion chamber 10 </ b> A, and is led out from an outlet 32 provided on the lower side of the secondary combustion chamber 20 </ b> A. A conduction path 30A is provided. The exhaust passage body 40 is provided with an exhaust passage 40A for exhausting the exhaust gas generated in the secondary combustion chamber 20A from the exhaust port 42 through the exhaust port 41 provided on the upper side of the secondary combustion chamber 20A.

  Specifically, the first furnace body 10 is formed in a cylindrical shape with a bottom portion 12, and the upper opening is configured as the input port 11 and the interior is configured as the primary combustion chamber 10 </ b> A. The insertion port 11 is provided with a detachable opening / closing lid 13. The open / close lid 13 is provided with a peep window 14 that can be opened and closed. The opening / closing lid 13 is provided with a handle 15 for attaching / detaching the opening / closing lid 13. Further, the first furnace body 10 is provided with an air supply unit 16 capable of supplying air into the primary combustion chamber 10A. The air supply unit 16 is provided with a protrusion 17 having an opening 17a communicating with the primary combustion chamber 10A on the upper side, and an opening 17a of the protrusion 17 is slidably provided and adjusted by opening the opening 17a. And an adjustment lid 18 for adjusting the amount of air to be supplied. A rooster 19 is provided at the bottom 12. The first furnace body 10 may be appropriately provided with an ash removal outlet for taking out the ash accumulated on the bottom 12.

The second furnace body 20 has a lower side portion 21 formed in a cylindrical shape with a bottom wall 22, and an upper side portion 23 formed in a hollow inverted truncated cone shape with an upper wall 24. As shown in FIG. 5, it is desirable that the portion formed in the inverted truncated cone shape is 70% or more. In the embodiment, the ratio of the height H1 of the lower side portion 21 to the height H2 of the upper side portion 23 is formed as H1: H2 = 3: 7.
The inside of the second furnace body 20 is configured as a secondary combustion chamber 20A. A lead-out port 32 for the conduction path 30 </ b> A is formed in the lower portion 21 of the second furnace body 20. An exhaust port 41 of the exhaust passage 40 </ b> A is formed on the upper side of the upper portion 23 of the second furnace body 20. As a result, in the secondary combustion chamber 20A, at least the space between the outlet 32 and the outlet 41 is formed in an inverted truncated cone shape, and in the embodiment, from the position directly above the outlet 32 to the upper end including the outlet 41. It is formed in an inverted truncated cone shape. An opening 25 is provided in the center of the upper wall 24 of the second furnace body 20 so that a core member 50 described later can be taken in and out. A lid 26 that can be opened and closed is provided in the opening 25.

  The conduction path body 30 is formed in a duct shape having a conduction path 30A inside, and the conduction path 30A has combustion gas from the outlet 32 centered on the central axis P2 (FIG. 6) of the secondary combustion chamber 20A. It is formed so as to flow into the secondary combustion chamber 20A along the circumferential direction. Specifically, as shown in FIG. 6, a connection line Q connecting the central axis P1 of the primary combustion chamber 10A and the central axis P2 of the secondary combustion chamber 20A slightly above the bottom 12 of the first furnace body 10 as viewed from above. The inlet 31 of the conduction path 30A is formed in a half-circumferential part on the secondary combustion chamber 20A side with respect to the orthogonal line R1 passing through the central axis P1 of the primary combustion chamber 10A. On the other hand, as shown in FIG. 6, the second furnace body 20 has a lower portion 21 orthogonal to a connection Q connecting the central axis P1 of the primary combustion chamber 10A and the central axis P2 of the secondary combustion chamber 20A as viewed from above. Of the half-circumferential portion on the primary combustion chamber 10A side with respect to the orthogonal line R2 passing through the central axis P2 of the secondary combustion chamber 20A, the lead-out port 32 of the conduction path 30A is half of that (the entire (¼) circumferential portion). Is formed. As shown in FIG. 5, the height of the outlet 32 is set to be substantially the same as the lower side portion 21 of the second furnace body 20. As shown in FIG. 6, when viewed from the top, one wall 33 of the duct-like conduction path body 30 is provided along the tangential direction of the primary combustion chamber 10A and the secondary combustion chamber 20A, and the other wall 34 is guided. The opening cross section of the passage 30A is formed so as to be gradually narrowed toward the secondary combustion chamber 20A.

  The exhaust path body 40 is formed in a duct shape having an exhaust path 40A inside, and the exhaust path 40A allows the exhaust gas from the secondary combustion chamber 20A to flow out from the exhaust port 41 substantially along the swirl direction. Is formed. Specifically, the exhaust port 41 of the exhaust passage 40 </ b> A is formed on the side of the upper portion 23 of the second furnace body 20 on the first furnace body 10 side. That is, as shown in FIG. 6, the outlet 32 of the conduction path 30A and the outlet 41 of the exhaust path 40A have a central axis P1 of the primary combustion chamber 10A and a central axis P2 of the secondary combustion chamber 20A as viewed from above. Is positioned closer to the central axis P1 side of the primary combustion chamber 10A than the orthogonal line R2 passing through the central axis P2 of the secondary combustion chamber 20A and orthogonal to the connection line Q. As shown in FIG. 6, the duct-shaped exhaust passage body 40 has an axis R3 inclined at about 45 ° C. (θ) with respect to the connection Q as viewed from above, and the exhaust port 41 has a secondary combustion chamber 20A. (1/4) circumference. The one wall 43 and the other wall 44 of the exhaust passage body 40 are inclined so that the opening cross section of the exhaust passage 40A gradually becomes narrower from the exhaust port 41 toward the discharge port 42. The discharge port 42 is open upward and is formed in a cylindrical shape to which a chimney (not shown) can be connected.

A core member 50 is provided in the secondary combustion chamber 20A. The core member 50 is made of metal such as iron, and is formed in an inverted cone shape or an inverted truncated cone shape centering on the central axis P2 of the secondary combustion chamber 20A. In the embodiment, the core member 50 is formed in a hollow inverted truncated cone shape. A guide passage 51 is formed between the wall of the secondary combustion chamber 20A and guides the combustion gas flowing in from the outlet 32 of the conduction passage 30A. On the outer peripheral surface of the core member 50, a spiral spiral blade 52 that is spaced from the wall surface of the secondary combustion chamber 20A and that has the central axis P2 of the core member 50 as the center is provided by welding or the like. The spiral blade 52 is attached to the core member 50 with approximately four turns. Specifically, the lower end of the core member 50 is supported by a support column 53 erected on the bottom wall 22 of the second furnace body 20. As shown in FIG. 5, in the embodiment, the height H3 of the support column 53 is set to H3≈H1, and the height H4 of the core member 50 is set to H4≈ (2/3) H2. That is, most of the core member 50 is provided corresponding to the inverted frustoconical secondary combustion chamber 20A. As shown in FIG. 5, the distance between the core member 50 and the wall of the secondary combustion chamber 20A is D1, the diameter of the core member 50 (including the outer periphery of the spiral blade 52) in an arbitrary flat section Sa. When the diameter of the combustion chamber 20A is D2, 2D1 ≦ D2 is set.
The core member 50 is integrated with the support column 53, and the support column 53 is detachably inserted and fixed to the bottom wall 22 of the second furnace body 20, for example. The core member 50 can be taken in and out by opening and closing the lid 26 provided at the center of the upper wall 24 of the second furnace body 20.

Furthermore, the bottom 2 of the main body 1 is supported by the legs 3. The legs 3 are provided on the front side so as to support the left and right sides of the first furnace body 10 and also support the second furnace body 20. Thus, a pair is provided on the rear side.
Below the bottom 2 of the main body 1, a metal receiving plate 4 that receives heat from the bottom 2 is provided. The receiving plate 4 is formed in a shape corresponding to the first furnace body 10, the conduction path body 30 and the second furnace body 20. Supported by the body 3.
Further, a metal heat radiation plate 5 projects from the main body 1. The heat radiation plate 5 is provided so as to protrude from the upper surface of the conduction path body 30 to the left and right.

  Therefore, when the solid fuel W such as soot is burned by the stove S, as shown in FIG. 1, the solid fuel W is introduced into the primary combustion chamber 10A from the inlet 11 and ignited. Since the combustion air is supplied from the air supply unit 16 to the primary combustion chamber 10A, the solid fuel W is combusted in the primary combustion chamber 10A, and the combustion gas is introduced into the introduction port 31 of the conduction path 30A and from the outlet 32. It is led out to the secondary combustion chamber 20A and flows into the secondary combustion chamber 20A. The conduction path 30A is formed so that the combustion gas from the outlet 32 flows into the secondary combustion chamber 20A along the circumferential direction around the central axis P2 of the secondary combustion chamber 20A. It turns around the combustion chamber 20A and rises. In this turning and ascending process, the unburned gas further burns and becomes exhaust gas, which is exhausted from the exhaust port 42 through the exhaust port 41 of the exhaust passage 40A.

  At this time, in the secondary combustion chamber 20A, the secondary combustion chamber 20A is formed in an inverted conical shape, and a core member 50 formed in the shape of an inverted cone or an inverted truncated cone is provided at the center thereof. Since the guide passage 51 for guiding the combustion gas is formed between the wall surface of 20A and the core member 50, the combustion gas flowing in from the outlet 32 of the conduction passage 30A is guided by the guide passage 51. Therefore, the combustion gas swirls and rises along the wall surface of the secondary combustion chamber 20A, so that the combustion is performed without disturbing the flow, and the situation where the unburned gas and the exhaust gas are mixed to impair the combustion efficiency is prevented. be able to.

  Further, since the spiral blade 52 is provided on the outer peripheral surface of the core member 50, the combustion gas is guided by the guide passage 51. However, the combustion gas is also guided by the spiral blade 52 and turns and rises. It can be burned without disturbing the flow. In this case, since the combustion gas rises along the wall surface of the secondary combustion chamber 20A due to centrifugal force, the flow resistance by the spiral blade 52 does not increase so much, and the situation of hindering the flow is prevented. . That is, the wall of the secondary combustion chamber 20A that constitutes the guide passage 51 does not protrude a member that obstructs the flow of the combustion gas, so that the flow resistance of the combustion gas does not increase and the combustion gas swirls and rises. It can be performed smoothly.

In particular, since the secondary combustion chamber 20A is formed in the shape of an inverted truncated cone, the circumferential length becomes longer as it rises, so that the flow velocity decreases and the centrifugal force drops, so that a pressure difference occurs between the upper and lower sides. Therefore, an upward pulling force is generated, and the combustion gas can be smoothly swung and raised also in this respect.
That is, the length of the chimney is increased, a separate burner is not provided, or a suction fan is not provided, and the core member 50 is provided in a simple structure, and the unburned gas and exhaust gas in the secondary combustion chamber 20A. And the flow resistance of the combustion gas is reduced as much as possible so that the swirling flow of the combustion gas can be generated, and the combustion efficiency in the secondary combustion chamber 20A can be improved.

  Further, since the exhaust passage 40A is formed so that the exhaust gas from the secondary combustion chamber 20A flows out from the exhaust port 41 substantially along the swirl direction, the exhaust gas generated in the secondary combustion chamber 20A is As a result, the swirling force of the swirling flow of the combustion gas can be increased, the swirling flow becomes smoother, and the combustion efficiency in the secondary combustion chamber 20A is improved. Can be achieved.

  Further, the outlet 32 of the conduction path 30A and the exhaust 41 of the exhaust path 40A are located closer to the central axis P1 side of the primary combustion chamber 10A than the orthogonal line R2 passing through the central axis P2 of the secondary combustion chamber 20A. That is, since the outlet 32 of the conducting path 30A and the outlet 41 of the exhaust path 40A are located on the same side with respect to the orthogonal line R2, the swirling flow is completely rotated so that the combustion gas flows out. Therefore, also in this respect, the swirling force of the swirling flow of the combustion gas can be increased, the swirling flow becomes smoother, and the combustion efficiency in the secondary combustion chamber 20A can be improved. If the lead-out port 32 of the conduction path 30A and the exhaust port 41 of the exhaust path 40A are at positions facing each other across the orthogonal line R2 passing through the central axis P2 of the secondary combustion chamber 20A, the combustion gas However, the combustion gas may flow out as a shortcut because the swirl flow cannot be rotated, and the combustion efficiency is reduced accordingly.

Due to this combustion, heat is radiated from the main body 1 and is used for heating. In this case, since the metal receiving plate 4 that receives heat from the bottom portion is provided below the bottom portion of the main body 1, the heat from the main body 1 does not directly reach the floor and is received by the receiving plate 4. The heat radiation efficiency can be improved.
In addition, since the metal heat radiation plate 5 protrudes from the main body 1, heat can be dissipated also by the heat radiation plate 5, and the heat radiation efficiency is also improved in this respect.

  FIG. 7 shows another example of the core member 50, which differs from the above in that the height of the support column 53 is lower than the height of the lower side portion 21 of the second furnace body 20. The lower end of 50 faces the lower portion 21, and the upper end is formed so as to be located at the same level as the lower end of the discharge port 41. Further, the pitch of the spiral blades 52 is smaller than that described above (approx. 4 turns attached to the core member 50) (approx. 8 turns attached to the core member 50). The operation and effect are the same as above.

  In the embodiment described above, the sizes of the primary combustion chamber 10A, the secondary combustion chamber 20A, and the core member 50 are not limited to the above, and may be changed as appropriate.

S Stove W Solid fuel 1 Body 2 Bottom 3 Leg 4 Receptacle 5 Heat radiation plate 10 First furnace body 10A Primary combustion chamber 11 Input port 12 Bottom portion 13 Opening / closing lid 16 Air supply section 19 Rooster 20 Second furnace body 20A Secondary Combustion chamber 21 Lower side 22 Bottom wall 23 Upper side 24 Upper wall 25 Opening 26 Lid 30 Conducting path body 30A Conducting path 31 Inlet 32 Outlet P1 Central axis P2 of primary combustion chamber 10A Central axis Q of secondary combustion chamber 20A Q Connection R1 Orthogonal line R2 passing through the central axis P1 Orthogonal line 40 passing through the central axis P2 Exhaust passage body 40A Exhaust passage 41 Exhaust port 42 Discharge port 50 Core member 51 Guide passage 52 Spiral blade 53 Strut

Claims (6)

A primary combustion chamber having an openable and closable inlet for charging solid fuel and burning the solid fuel input from the inlet, and a combustion gas from the primary combustion chamber disposed in the horizontal direction in the primary combustion chamber A secondary combustion chamber to be introduced, and a conduction path for introducing combustion gas in the primary combustion chamber from an inlet provided on the lower side of the primary combustion chamber and leading out from an outlet provided on the lower side of the secondary combustion chamber And a stove provided with an exhaust passage for exhausting exhaust gas generated in the secondary combustion chamber from an exhaust port through an exhaust port provided on the upper side of the secondary combustion chamber,
At least the outlet and the outlet of the secondary combustion chamber are formed in an inverted truncated cone shape, and the combustion gas from the outlet is centered on the central axis of the secondary combustion chamber in the conduction path. It is formed so as to flow into the secondary combustion chamber along the circumferential direction, and is formed in an inverted conical shape or an inverted frustoconical shape centering on the central axis of the secondary combustion chamber in the secondary combustion chamber. A stove comprising a core member for forming a guide passage for guiding combustion gas flowing in from the outlet of the conduction path between the wall of the secondary combustion chamber.   2. The stove according to claim 1, wherein a spiral helix blade is provided on the outer peripheral surface of the core member and spaced apart from the wall surface of the secondary combustion chamber and centering on the central axis of the core member.   The stove according to claim 1 or 2, wherein the exhaust passage is formed so that the exhaust gas from the secondary combustion chamber flows out from the exhaust inlet substantially along the swirl direction.   The lead-out port of the conduction path and the exhaust port of the exhaust path are orthogonal to a connection connecting the central axis of the primary combustion chamber and the central axis of the secondary combustion chamber when viewed from above, and the center of the secondary combustion chamber The stove according to claim 3, wherein the stove is positioned closer to the central axis side of the primary combustion chamber than an orthogonal line passing through the axis.   A first furnace body having the primary combustion chamber; a second furnace body having the secondary combustion chamber; a conduction path body provided between the first furnace body and the second furnace body and having the conduction path; and the second furnace. A metal main body having an exhaust passage body connected to the body and having the exhaust passage is provided, and a metal receiving plate that receives heat from the bottom portion is provided below the bottom portion of the main body. The stove according to any one of claims 1 to 4.   6. The stove according to claim 5, wherein a metal heat radiation plate is projected from the main body.

Images