WO2011018819A1

WO2011018819A1 - Wood stove

Info

Publication number: WO2011018819A1
Application number: PCT/JP2009/003850
Authority: WO
Inventors: 村木治一
Original assignee: 稲葉茂人
Priority date: 2009-08-11
Filing date: 2009-08-11
Publication date: 2011-02-17

Abstract

Two vent holes (12, 13), that are used to introduce outside air into a combustion chamber by means of natural aeration, are created at locations at the lower end of an outer wall part (4f) of the combustion chamber (4) of a wood stove (1). Rectangular open frames (14, 15) are attached to vent holes (12, 13), and opening/closing covers (16, 17) are attached to the rectangular open frames (14, 15). Outside air introduced through the vent holes (12, 13) is directed tangentially along the circular inner circumferential surface (4g) of the outer wall part (4f) of the combustion chamber (4) by the rectangular open frames (14, 15) and the opening/closing covers (16, 17), and an uprising swirling air flow (B) is formed inside the combustion chamber, whereby wood combustion efficiency can be improved. The opening/closing covers (16, 17) can be used to automatically change the degree of opening of the vent holes (12, 13) according to the combustion chamber temperature, and the interior of the combustion chamber can be prevented from overheating.

Description

Wood-burning stove

The present invention relates to a stove that uses firewood or wood-based fuel as fuel, and in particular, burns firewood such as conifers in a combustion mode close to complete combustion by supplying sufficient combustion air to suppress the generation of firewood, tar, etc. It relates to a wood stove that can be made.

In recent years, wood-burning stoves that use wood, such as thinned wood, which is a natural fuel resource, have attracted attention. As fuel for wood burning stoves, conifers obtained in large amounts from Japanese forests are considered, but conifers are black or brown viscous oils produced by dry distillation of solid organic matter such as firewood and tar (coal, charcoal). It is a substance, and its main component is a large amount of hydrocarbons, coal tar, wood tar, petroleum tar, etc.), and it is said that it is easy to clog the chimney, and it has not been used so far. In order to make effective use of renewable fuels such as conifers, firewood is burned in a form closer to complete combustion by spreading the combustion air sufficiently in the stove (combustion furnace), soot, tar, etc. It is necessary to suppress the occurrence of

Here, wood stoves that are not equipped with a blower are used not only as a heating device for houses but also as a heating device for forcing cultivation of vegetables and fruits in a greenhouse. In such a wood stove, combustion air is supplied into the combustion furnace by natural draft through the vent. Insufficient combustion is likely to occur in the combustion furnace because sufficient combustion air is not supplied to the combustion furnace with only one vent hole. For this reason, a large amount of soot and tar are generated, and the chimney is clogged in a short period of time, so it is necessary to clean the chimney frequently.

Patent Document 1 discloses a wood stove in which a sufficient amount of combustion air can be introduced into a combustion furnace by natural wind power. In the wood stove disclosed in Patent Document 1, outside air is supplied obliquely from above to the wood placing portion in the furnace, and the outside air is supplied horizontally toward the upper center of the wood placing portion. Thus, gas convection is generated in the vertical direction in the furnace. As a result, the outside air can be sufficiently supplied to the soot placement portion so that the soot is burned smoothly.

Japanese Patent Laid-Open No. 2004-77060

In the wood stove disclosed in Patent Document 1, in order to introduce the outside air into the furnace, a pair of inclined air supply pipes extending from the outer peripheral side of the cylindrical furnace body to the inside are disposed, and the bottom of the furnace body is also horizontally disposed. An air supply pipe is arranged and the structure is complicated. Moreover, it is not easy to stably generate convection of gas in the vertical direction in the furnace by natural wind power.

The problem of the present invention is that a simple structure can distribute sufficient air throughout the combustion furnace, thereby suppressing the generation of soot, tar, etc., and has been regarded as unsuitable as so far. The purpose is to propose a wood-burning stove suitable for using wood such as dried conifers as fuel.

In order to solve the above problems, the wood stove of the present invention is:
A cylindrical combustion furnace;
A fuel inlet formed in the outer peripheral wall of the combustion furnace;
A plurality of ventilation openings for introducing combustion air into the combustion furnace by natural ventilation;
An exhaust port communicating with a portion above the fuel input port in the combustion furnace,
The vent hole is formed in a portion of the outer peripheral wall that is lower than the fuel inlet, and is at a position away from each other in the circumferential direction of the outer peripheral wall,
Each of the vent holes has an air introduction direction set in the combustion furnace so that a swirling air flow around the central axis of the combustion furnace is formed inside the combustion furnace. It is a feature.

In the wood stove of the present invention, a plurality of ventilation openings, for example, 2 to 6 ventilation openings are provided. In the northern hemisphere, the fluid has a characteristic that it tends to vortex counterclockwise. In the southern hemisphere, on the contrary, it has a characteristic that it tends to vortex clockwise, and this force is called Coriolis force. Therefore, in general, when the wood stove of the present invention is used in the northern hemisphere, the air introduction direction of each ventilation port may be set so that the supplied combustion air swirls counterclockwise. When using in the above, the air introduction direction of each ventilation port may be set so as to wind a vortex in the reverse direction. Of course, in the northern hemisphere and the southern hemisphere, it is also possible to set the air introduction direction of each ventilation port so as to make a vortex in the opposite direction.

In the wood stove of the present invention, outside air is introduced so that a swirling air flow is formed in the combustion furnace. By the combustion of soot in the combustion furnace, the swirling air flow becomes an upward swirling air flow and flows toward the exhaust port. In this way, a swirling air flow from the lower side to the upper side is formed in the combustion furnace. Therefore, the swirling combustion air takes a long time to touch the soot introduced into the combustion furnace, and sufficient combustion air is supplied to every corner of the soot. A near combustion state can be created, and generation of soot, tar and the like is suppressed. Therefore, the wood stove of the present invention is suitable for using wood such as conifers that has not been conventionally used as wood.

Here, in general, the outer peripheral wall of the combustion furnace has a circular inner peripheral surface, and the vents are formed at equiangular intervals along the circular inner peripheral surface. In this case, the air introduction direction of each ventilation port is a tangential direction with respect to the circular inner peripheral surface.

¡In order to be able to adjust the supply amount of combustion air introduced from each ventilation port, it is desirable to attach an opening / closing lid whose opening degree can be changed to each ventilation port. In this case, it is desirable to provide a bimetal combustion temperature sensing type automatic opening / closing lid instead of adjusting the opening of each ventilation port by manual operation. For example, the opening / closing lid has a configuration in which the opening degree of the ventilation port becomes smaller as the combustion temperature in the combustion furnace rises based on the difference in thermal expansion coefficient between two types of metal members having different thermal expansion coefficients. It is desirable.

In the soot stove of the present invention, in order to make it possible to easily carry out soot operation into the combustion furnace, a bottom made of a porous material attached to an open / close door that opens and closes the fuel input port. It is desirable to have a cylindrical fuel input rod with a mark. When the open / close door can open and close between the closed position where the fuel inlet is closed and the open position where it falls to the outside of the combustion furnace with the lower end edge as the center, the open / close door is closed. When the position is set, the fuel input rod is in a combustion position that is coaxial with the combustion furnace in the combustion furnace, and when the open / close door is set to the open position, the fuel input rod has an upper end opening from the fuel input port. It is desirable that the fuel input position is exposed obliquely upward on the outside. Fuel such as soot can be easily introduced into a fuel introduction soot that faces obliquely upward from the fuel input port.

Further, in order to prevent the formation of the swirling air flow from being disturbed by the fuel charging rod, there is no gap between the fuel charging rod at the combustion position and the inner peripheral surface of the outer peripheral wall of the combustion furnace. It is desirable to form an air circulation space through which the swirling air flow flows. When the inner peripheral surface of the combustion furnace is a circular inner peripheral surface, it is desirable to use a cylindrical fuel charging rod to form an air circulation space having an annular cross section.

Next, in the wood stove of the present invention, the lower end edge of the ventilation port is positioned at a certain height from the bottom surface of the combustion furnace, and between the bottom surface of the combustion furnace and the lower end edge of the ventilation port. It is desirable to make the combustion furnace internal space function as a dry distillation region where the combustion fuel is liable to cause dry distillation. In the case where a fuel input soot is provided, the lower end side portion of the fuel input soot at the combustion position may be positioned within the dry distillation region of the combustion furnace.

That is, in the wood stove according to the present invention, combustion is promoted by the swirling air flow and the combustion temperature in the combustion furnace becomes high. The formation of charcoal can be facilitated by providing a portion that is easily heated and decomposed to separate it into a volatile component and a solid residue. By providing the ventilation port at a predetermined height position from the bottom surface of the combustion furnace, the portion below the ventilation port in the combustion furnace becomes short of combustion air and becomes a portion where dry distillation is likely to occur. In the present invention, a portion where intentionally formed carbonization within the combustion furnace is likely to occur is called a “carbonization region” in the present invention.

In this case, the bottom surface of the combustion furnace is defined by an inclined bottom plate portion that is inclined downward toward the center of the combustion furnace, a water evaporating dish is disposed below the inclined bottom plate portion, and the water evaporation is performed. When the water stored in the dish is heated to become steam, it is desirable that the steam flows into the combustion furnace through a communication hole opened in the center of the inclined bottom plate portion. In addition, you may arrange | position the water supply tank for supplying water to a water evaporating dish.

水 Install a water evaporating dish at the bottom of the dry distillation area, fill it with water, and generate a large amount of water vapor. The generated steam flows into the combustion furnace from the communication hole at the center of the inclined bottom plate portion, and rises in the combustion furnace. Here, in the combustion furnace, the air introduced from each ventilation port becomes a swirling flow and rises upward from the lower side, and the atmospheric pressure at the center portion is lower than the outer peripheral side. Therefore, the generated water vapor quickly rises toward the central portion in the combustion furnace. When the water vapor that has risen passes through the dry distillation region at the bottom side of the combustion furnace, it touches the charcoal produced there, causing a chemical reaction that changes to CO, HO, H, etc., that is, a “water gas reaction”. . Since the generated water gas can be used as an auxiliary fuel, the combustion efficiency of soot in the combustion furnace can be increased. At the same time, since the water gas reaction is also an endothermic reaction, it also has a cooling effect for suppressing the temperature in the combustion furnace from becoming too high.

In the wood stove of the present invention, the combustion air introduced into the combustion furnace from a plurality of vents is swirled and flows in the combustion furnace from the bottom to the top. Therefore, the combustion air is sufficiently supplied to the soot put in the combustion furnace, and a combustion state closer to complete combustion can be formed as compared with the conventional case. Therefore, even when conifers are used as firewood, generation of firewood, tar, etc. can be suppressed.

It is an external appearance perspective view which shows the wood stove concerning embodiment of this invention. It is an external appearance perspective view which shows the wood stove of the state which opened and closed the door. It is a schematic longitudinal cross-sectional view of the wood stove of FIG. 1A. It is a schematic longitudinal cross-sectional view of the wood stove of the state which opened the opening-and-closing lid | cover shown to FIG. 1B. FIG. 3B is a schematic cross-sectional view showing a part cut along line III-III in FIG. 2A. FIG. 4 is a schematic cross-sectional view showing a portion cut along line IV-IV in FIG. 2A. It is an expanded partial sectional view which shows the part of the ventilation opening of FIG. It is a perspective view which shows the open / close lid attached to the ventilation port of FIG. It is explanatory drawing which shows the turning airflow formed in the combustion furnace of the wood stove of FIG. It is a general | schematic fragmentary longitudinal cross-section which shows the part by the side of the wood stove of FIG. It is a schematic partial longitudinal cross-sectional view which shows the flow of the vapor | steam which generate | occur | produced in the part of the bottom side of the wood stove of FIG.

Hereinafter, an embodiment of a wood stove to which the present invention is applied will be described with reference to the drawings.

(overall structure)
FIG. 1A is an external perspective view showing a wood stove according to the present embodiment, and FIG. 2A is a schematic longitudinal sectional view thereof. 3 is a schematic cross-sectional view showing a portion cut along line III-III in FIG. 2A, and FIG. 4 is a schematic cross-sectional view showing a portion cut along line IV-IV in FIG. 2A. The wood stove 1 is provided with a rectangular horizontal support plate 2, and support legs 3 whose heights can be adjusted are attached to the four corners of the horizontal support plate 2. A cylindrical combustion furnace 4 is vertically attached to the horizontal support plate 2.

The upper end of the combustion furnace 4 is sealed by a truncated cone-shaped top plate portion 4a that is constricted upward, and an exhaust cylinder 4b that protrudes vertically upward is formed at the center of the top plate portion 4a. Yes. The exhaust port 4c at the tip of the exhaust cylinder 4b communicates with a chimney (not shown) connected to the exhaust cylinder 4b in a coaxial state. As shown in FIG. 2A, the lower end of the combustion furnace 4 is blocked by a truncated cone-shaped inclined bottom plate portion 4d that is narrowed downward, and a circular opening 4e is formed at the center of the inclined bottom plate portion 4d. Yes. An annular water evaporating dish 5 is horizontally attached outside the circular opening 4e below the inclined bottom plate portion 4d. The circular inner peripheral edge 5a of the water evaporating dish 5 stands up to the vicinity of the back surface side of the inclined bottom plate portion 4d.

At the front portion of the outer wall portion 4f of the combustion furnace 4, a fuel input port 7 defined by the rectangular frame plate 6 is formed at a middle height position in the vertical direction. The fuel inlet 7 is sealed by an open / close door 8 that can be opened and closed with the lower frame portion 6a of the rectangular frame plate 6 as a center. A window 8a made of a transparent material such as heat-resistant glass is formed in the central portion of the open / close door 8 so that the inside of the combustion furnace 4 can be visually observed. An opening / closing handle 8b is attached to the outer surface.

A pair of left and right support arms 9 extending vertically inwardly from the inside surface of the open / close door 8 is attached, and a cylindrical fuel input rod 10 with a cylindrical bottom is supported by these support arms 9. Yes. The fuel charging rod 10 is formed using, for example, a stainless steel wire net having a mesh 3.5, a wire diameter of 1.6 mm, an opening of 5.66 mm, and a space ratio of 60.8%. When the open / close door 8 is closed, as shown in FIG. 3, an annular cross-section is formed between the circular inner peripheral surface 4 g of the outer wall portion 4 f of the combustion furnace 4 and the circular outer peripheral surface 10 a of the fuel input rod 10. A gap A is formed.

A shallow petri dish-like ash collection tray 30 is attached to the lower side of the combustion furnace 4, that is, below the inclined bottom plate portion 4d, in a state where it can be pulled out forward. Combustion residues such as ash dropped along the inclined bottom plate portion 4d are collected in the lower ash collection tray 30. Further, a water supply tank mounting portion 31 attached to the horizontal support plate 2 is located on the side of the combustion furnace 4. The upper end of the water supply tank mounting portion 31 is a rectangular opening, and a rectangular parallelepiped water supply tank 32 is mounted on the upper side of the water supply tank mounting section 31 from above. In addition, illustration of the ash collection | recovery tray 30 is abbreviate | omitted in figures other than FIG. 1A and FIG. 1B.

(Ventilation opening)
As can be seen from FIG. 4, the cylindrical outer wall portion 4f of the combustion furnace 4 is formed with a plurality of ventilation openings for introducing outside air into the combustion furnace by natural ventilation. In this example, two

vent holes

12 and 13 are formed at positions 180 degrees apart in the circumferential direction in the outer wall portion 4f. The front vent 12 is formed at a position slightly below the right side below the fuel inlet 7, and these

vents

12 and 13 have the same shape at the same height. These

ventilation openings

12 and 13 are rectangular openings extending in the circumferential direction of the outer wall portion 4 f of the combustion furnace 4, and rectangular opening frames 14 and 15 are attached to these openings. Open /

close lids

16 and 17 are attached.

FIG. 5 is an enlarged partial sectional view showing a portion of the outer wall portion 4f of the combustion furnace 4 to which one opening / closing lid 17 is attached, and FIG. 6 is a perspective view showing the opening / closing lid 12. FIG. The open / close lid 17 includes a fixed-side cover plate 18 fixed to one vertical frame portion 15a of the rectangular opening frame 15, a turn-side cover plate 19 attached to the free end of the fixed-side cover plate 18 so as to be turnable, A connecting bar 20 is provided between the fixed side cover plate 18 and the inner side surface of the swivel side cover plate 19. The fixed side cover plate 18 and the swivel side cover plate 19 are made of invariant steel such as invar, super invar, stainless invar, and the connecting bar 20 is made of plain steel. When the combustion furnace 4 reaches a high temperature due to combustion, the connecting bar 20 is heated and expands and extends, and accordingly, the turning side cover plate 19 turns to the outside around the leading edge 18a of the fixed side cover plate 18. When the heating temperature decreases, the connecting bar 20 contracts and the turning-side cover plate 19 returns to the original position again.

The fixed-side cover plate 18 extends from one vertical frame portion 15a of the rectangular opening frame 15 toward the other vertical edge portion 15b. That is, the fixed-side cover plate 18 extends in a direction parallel to the tangent to the circular inner peripheral surface 4g of the outer wall portion 4f drawn from the portion of the one vertical edge 13a of the vent hole 13. The turning-side cover plate 19 extends from the front end of the fixed-side cover plate 18 toward the inside (combustion furnace side). On the other hand, the other vertical frame portion 15b of the rectangular opening frame 15 extends from the other vertical edge 13b of the ventilation port 13 in the tangential direction of the circular inner peripheral surface 4g. Therefore, the opening degree of the vent hole 13 is defined by the turning-side cover plate 19 and the vertical edge portion 15b of the rectangular opening frame 15 facing the turning-side cover plate 19, and when the turning-side cover plate 19 approaches the vertical edge portion 15b. The opening degree becomes small. Further, the direction of the outside air introduced through the ventilation port 13 (air introduction direction) is a tangential direction defined by the vertical edge portion 15b extending in the tangential direction of the circular inner peripheral surface 4g. The rectangular opening frame 13 and the opening / closing lid 16 of the other ventilation opening 12 are arranged in a point-symmetric state with respect to the ventilation opening 13 side.

Therefore, as shown in FIG. 7, the outside air introduced through the pair of vent holes 12, 13 flows into the circular inner peripheral surface 4 g of the outer wall portion 4 f of the combustion furnace 4 at the bottom side portion of the combustion furnace 4. A swirling air flow around the central axis of the combustion furnace 4 is formed. This swirling air flow becomes an upward swirling air flow by combustion of soot inside the combustion furnace and flows toward the exhaust port 4c at the upper end of the combustion furnace. In this example, in the combustion furnace 4, a counterclockwise ascending swirl air flow B is formed along a gap A having an annular cross section formed between the circular inner peripheral surface 4 g and the fuel charging rod 10.

(Fuel input)
FIG. 1B is an external perspective view showing a state in which the open / close door 8 is opened, and FIG. 2B is a schematic longitudinal sectional view of the state. With reference mainly to these drawings, the movement of the fuel input rod 10 accompanying the opening and closing of the door 8 will be described.

The open / close door 8 is centered on the lower edge of the door 8 from the closed position 8A (FIG. 1A, FIG. 2A) where the fuel inlet 7 is closed to the open position 8B (FIG. 1B, FIG. 2B) which falls to the outside of the combustion furnace 4. It can be opened and closed. When the open / close door 8 is in the closed position, the fuel charging rod 10 is in the combustion position 10A (FIGS. 1A and 2A) in the combustion furnace 4 that is coaxial with the combustion furnace 4. When the open / close door 8 is set to the open position 8B, the fuel input rod 10 becomes a fuel input position 10B (FIGS. 1B and 2B) in which the upper end opening 10a is exposed obliquely upward from the fuel input port 7. At the fuel charging position 10B, the fuel charging rod 10 is inclined almost horizontally, so that the operation of charging the rod from the upper end opening 10a can be easily performed. Further, as described above, since the fuel charging rod 10 is formed of a porous material, in this example, a mesh, it has good air permeability, and combustion air is sufficiently supplied to the inside thereof.

(Dry distillation area and water evaporating dish)
FIGS. 8 and 9 are partial schematic longitudinal sectional views showing a lower end side portion of the combustion furnace 4 of the wood stove 1. In the wood stove 1 of the present embodiment, the lower end edges of the vent holes 12 and 13 are located at a certain height from the inclined bottom plate portion 4 d that defines the bottom surface of the combustion furnace 4. For this reason, the combustion furnace internal space between the inclined bottom plate portion 4d in the combustion furnace 4 and the lower end edges of the vent holes 12 and 13 is a dry distillation region C in which the supply of combustion air is insufficient and the combustion fuel is liable to cause dry distillation. Function. In the state where the fuel charging rod 10 is at the combustion position 10 </ b> A, the lower end portion thereof is set so as to be located in the dry distillation region C of the combustion furnace 4.

In the wood stove 1, combustion is promoted by the swirling air flow B and the combustion temperature in the combustion furnace 4 becomes high. Therefore, the charcoal is generated by intentionally forming the dry distillation region C by using an excess amount of heat. Can be encouraged. By providing the vent holes 12 and 13 at a certain height position from the bottom of the combustion furnace 4, the portion below the vent holes 12 and 13 in the combustion furnace 4 has a shortage of combustion air. Function.

Next, a water evaporating dish 5 is disposed below the dry distillation region C, that is, below the inclined bottom plate portion 4d that defines the bottom of the combustion furnace 4. A certain amount of water is stored in the water evaporating dish 5, and water is replenished from the water supply tank 32 when the water level drops.

As shown in FIG. 9, when the water stored in the water evaporating dish 5 is heated by the burning of soot in the combustion chamber 4 to become water vapor, it passes through a circular opening 4e opened at the center of the inclined bottom plate portion 4d. Ascend and flow into the bottom dry distillation region C in the combustion furnace 4.

In the combustion furnace 4, the outside air introduced from each of the

vents

12 and 13 becomes a swirling air flow B and rises upward from the lower side, and the atmospheric pressure at the center is lower than that on the outer peripheral side. Therefore, the generated water vapor quickly rises toward the central portion in the combustion furnace 4. When the water vapor that has risen passes through the carbonization region C of the combustion furnace 4, it touches the charcoal produced by the combustion there and undergoes a chemical reaction that changes to CO, HO, H, etc. Wake up. Since the generated water gas can be used as an auxiliary fuel, the combustion efficiency of soot in the combustion furnace 4 can be increased. Further, since the water gas reaction is also an endothermic reaction, it also has a cooling action for suppressing the inside of the combustion furnace 4 from becoming too high.

As described above, in the wood stove 1, a swirling air flow B is formed in the combustion furnace 4 from the lower side to the upper side. Therefore, the swirling combustion air takes a long time to come into contact with the soot introduced into the combustion furnace 4, and sufficient combustion air is supplied to every corner of the soot, so that complete combustion is achieved as compared with the case of the conventional soot stove. It is possible to create a combustion state closer to that, and the generation of soot, tar and the like is suppressed. Further, a dry distillation region C is formed at the bottom side portion of the combustion furnace 4, and water vapor generated from the lower side rises and flows into the dry distillation region C to cause a water gas reaction, and the generated water gas is used as an auxiliary fuel. Function as. Therefore, wood such as conifers that has not been used in the past can be burned efficiently.

DESCRIPTION OF SYMBOLS 1 Wood stove 2 Horizontal support plate 3 Support leg 4 Combustion furnace 4a Top plate part 4b Exhaust pipe 4c Exhaust port 4d Inclined bottom plate part 4e Circular opening 4f Outer wall part 4g Circular inner peripheral surface 5 Water evaporating dish 6 Rectangular frame plate 7 Fuel inlet 8 Opening / closing door 9 Support arm 10 Fuel input rod 10a Circular outer peripheral surface 10b

Upper end opening

12, 13

Ventilation opening

14, 15

Rectangular opening frame

16, 17 Opening / closing lid 18 Fixed side lid plate 19 Revolving side lid plate 20 Connection bar 30 Ash recovery tray 31 Water supply tank mounting part 32 Water supply tank A Clearance (air circulation space)
B Swirling air flow C Carbonization region

Claims

A cylindrical combustion furnace (4);
A fuel inlet (7) formed in the outer peripheral wall (4f) of the combustion furnace (4);
A plurality of ventilation openings (12, 13) for introducing combustion air into the combustion furnace (4) by natural ventilation;
An exhaust port (4c) communicating with a portion above the fuel input port (7) in the combustion furnace (4),
The vent holes (12, 13) are formed in a portion of the outer peripheral wall (4f) below the fuel inlet (7) and are spaced apart from each other in the circumferential direction of the outer peripheral wall (4f). And
Each of the vent holes (12, 13) is configured so that a swirling air flow (B) centering on the central axis of the combustion furnace (4) is formed inside the combustion furnace (4). A wood stove (1), characterized in that the direction of air introduction into the furnace (4) is set.
The outer peripheral wall (4f) of the combustion furnace (4) has a circular inner peripheral surface (4g),
The vent holes (12, 13) are formed at equiangular intervals along the circular inner peripheral surface (4g),
The wood-burning stove (1) according to claim 1, wherein the air introduction direction of the ventilation openings (12, 13) is a tangential direction to the circular inner peripheral surface (4g).
The vent (12, 13) is provided with an open / close lid (16, 17) capable of changing the opening degree of the vent (12, 13).
The open / close lids (16, 17) are formed on the basis of the difference in thermal expansion coefficient between two types of metal members having different thermal expansion coefficients, and the ventilation ports (12, 17) are increased as the combustion temperature in the combustion furnace (4) increases. 13. Wood stove (1) according to claim 1, characterized in that the opening of 13) is small.
An open / close door (8) for opening and closing the fuel input port (7);
A cylindrical fuel input rod (10) with a bottom made of a porous material attached to the open / close door (8);
The opening / closing door (8) has a lower end edge as a center, and is between a closed position (8A) where the fuel inlet (7) is closed and an open position (8B) where the fuel door (8) falls to the outside of the combustion furnace (4). Can be opened and closed,
When the open / close door (8) is in the closed position (8A), the fuel charging rod (10) is in the combustion position (10A) that is coaxial with the combustion furnace (4) in the combustion furnace (4). When the open / close door (8) is in the open position (8B), the fuel input rod (10) has a fuel input position (10B) in which the upper end opening (10b) is exposed obliquely upward outward from the fuel input port (7). )
An air flow in which the swirling air flow flows between the fuel charging rod (10) at the combustion position (10A) and the inner peripheral surface (4g) of the outer peripheral wall (4f) of the combustion furnace (4). The wood stove (1) according to claim 1, characterized in that a space (A) is formed.
The lower end edge of the vent (12, 13) is located at a certain height from the bottom of the combustion furnace (4),
A combustion furnace internal space between the bottom surface of the combustion furnace (4) and a lower end edge of the vent (12, 13) functions as a dry distillation region (C) in which the combustion fuel is liable to cause dry distillation. The wood heating stove (1) according to claim 1.
An open / close door (8) for opening and closing the fuel input port (7);
A cylindrical fuel input rod (10) with a bottom attached to the open / close door (8);
The opening / closing door (8) has a lower end edge as a center, and is between a closed position (8A) where the fuel inlet (7) is closed and an open position (8B) where the fuel door (8) falls to the outside of the combustion furnace (4). Can be opened and closed,
When the open / close door (8) is in the closed position (8A), the fuel charging rod (10) is in the combustion position (10A) that is coaxial with the combustion furnace (4) in the combustion furnace (4). When the open / close door (8) is in the open position (8B), the fuel input rod (10) has a fuel input position (10B) in which the upper end opening (10b) is exposed obliquely upward outward from the fuel input port (7). )
The lower end side portion of the fuel charging rod (10) in the combustion position (10A) is located in the dry distillation region (C) of the combustion furnace (4), and the fuel charging rod (10) and the fuel charging rod (10) An air circulation space (A) through which the swirling air flow (B) flows is formed between the inner peripheral surface (4g) of the outer peripheral wall (4f) of the combustion furnace (4). The wood stove (1) according to item 5.
The outer peripheral wall (4f) of the combustion furnace (4) has a circular inner peripheral surface (4g),
The vent holes (12, 13) are formed at equiangular intervals along the circular inner peripheral surface (4g),
The air introduction direction of the vent holes (12, 13) is a tangential direction with respect to the circular inner peripheral surface (4g),
The fuel charging rod (10) has a cylindrical shape,
The air circulation space (A) having an annular cross section is formed between the circular inner peripheral surface (4g) of the outer peripheral wall (4f) and the circular outer peripheral surface (10a) of the fuel injection rod (10). The wood-burning stove (1) according to claim 6, characterized in that
The bottom surface of the combustion furnace (4) is defined by an inclined bottom plate portion (4d) inclined downward toward the center of the combustion furnace (4);
A water evaporating dish (5) is disposed below the inclined bottom plate portion (4d),
When the water accumulated in the water evaporating dish (5) is heated to become steam, the steam passes through the opening (4e) opened in the center of the inclined bottom plate portion (4d) and enters the combustion furnace (4). Wood stove (1) according to claim 5, characterized in that it flows in.
The wood heating stove (1) according to claim 8, further comprising a water supply tank (32) for storing make-up water for supplying water to the water evaporating dish (5).