JP2022081723A - Spontaneous combustion stove, use method of the same, and pellet box - Google Patents

Abstract

To provide a spontaneous combustion stove which can realize combustion similar to combustion in a fireplace, enables also pellets to be used as fuel, and can prevent back flow of combustion wind to reduce adhesion of soot when the pellets are used as the fuel.SOLUTION: A spontaneous combustion stove 10 includes: a supply part 1 which supplies wood fuel and air; a body combustion chamber 2 which communicates with the supply part 1 and in which combustion of the wood fuel is performed; and an exhaust part 3 which finally exhausts airflow from the body combustion chamber 2. A body airflow guide chamber 4 for extending an airflow circulation path is provided between the body combustion chamber 2 and the exhaust part 3. In the body airflow guide chamber 4, a front flow side ventilation port 5 leading to the body combustion chamber 2 and a rear flow side ventilation port 6 leading to the exhaust part 3 are respectively provided at an upper part and a lower part. The body combustion chamber 2 is provided with a window 7 which makes flame therein visible.SELECTED DRAWING: Figure 1

Description

There is an application for exception of loss of novelty

The present invention relates to a natural combustion stove, a method of using the stove, and a pellet box, and more particularly to a natural combustion stove that can use both firewood and pellet fuels and can be used with no power and no power source.

A pellet stove is a stove that uses wood pellets (hereinafter, simply referred to as "pellets") that are compression-molded into a fixed shape from wood or the like as a fuel. Since carbon dioxide generated by burning pellets is absorbed from the atmosphere during the tree growth process, so-called carbon neutrality, which does not affect the concentration of carbon dioxide in the atmosphere, is realized. Pellets also have the advantages of lower water content and easier burning, longer burning time, and easier control of input compared to firewood. On the other hand, it is conventionally common to use a fuel supply motor, a screw, a blower fan, an exhaust fan, or the like for the operation.

Patent applications have been filed for pellet stoves. For example, Patent Document 1 below describes a pellet combustor that is easy to attach to an existing stove and has excellent portability, and a tubular fuel storage unit that stores pellets and discharges them from an outlet as a stove for pellets. , Equipped with a tubular combustion part that receives and burns pellets discharged from its discharge port, the fuel storage part can be detachably attached above the combustion part, and the combustion part can be installed at the upper end opening of the stove. A pellet combustor of a certain configuration is disclosed. When not in use, the combustion unit can be housed in the fuel storage unit.

Further, Patent Document 2 describes that ash and soot scattered in the combustion chamber space due to the combustion wind are prevented from adhering to the inner surface of the glass window, and the temperature in the combustion chamber is prevented from dropping, so that the wood pellet fuel is efficient. As a wood pellet fuel combustion device that promotes combustion and at the same time enables good circulation and convection of combustion air in the combustion chamber to achieve visually good combustion with a well-organized flame, air is directed toward the surface of the glass. A configuration is disclosed in which a part of the heat radiation tube of the heat exchange section is communicated with the blowout section to be supplied. In this heat exchange section, warm air that is forcibly supplied by a fan and heated by the combustion air is generated, which is sent to the blowing section, and the blowing section blows warm air from above to below the glass surface. By being done, it is said that the purpose will be achieved.

Japanese Patent No. 6756963 "Pellet Combustor and Stove for Pellet" Japanese Patent Application Laid-Open No. 2005-233540 "Wood Pellet Fuel Combustor"

By the way, a wood-burning stove is often used as an outdoor stove mainly used for recreational purposes such as camping, but if the effect of burning like a fireplace can be obtained, the atmosphere can be further enhanced and the recreation can be further enhanced. In addition, the fireplace-like structure reduces soot and burns firewood efficiently by constructing a structure that takes a long distance inside the combustion chamber, and changes the amount of oxygen by adjusting the balance of intake and exhaust, resulting in firewood. It refers to at least a part of the fact that the way of burning and fluctuation can be changed, and that the structure that takes a long distance also improves the heat storage property.

Further, it is more convenient and preferable for recreational use if pellets, which are easier to supply as fuel and easily stabilize the amount of heat generated and the temperature range, can be used together in a wood stove which is a natural combustion method. However, when pellets are used in a non-powered, non-powered natural combustion method, there are problems such as backflow of combustion wind and adhesion of soot. There is a need for a wood stove that can use pellets without these problems.

That is, even when used as a pellet stove, the combustion wind does not flow back, soot does not adhere, and soot can be effectively prevented from adhering to the glass window, and the fluctuation of the internal flame can be sufficiently prevented. It would be nice if we could provide such a stove method that could be entertaining. In addition, once ignited, it is only necessary to manage the fuel supply, and it is possible to automatically burn at a stable temperature and amount of heat even though it is powerless and powerless, which is convenient for heating, cooking and directing. Moreover, it would be better if we could provide a method that is easy to maintain and convenient for storage and transportation.

Therefore, the problem to be solved by the present invention is to first provide a natural combustion stove capable of realizing fireplace-like combustion in view of the situation of the prior art. An object of the present invention is also to provide a natural combustion stove and a method thereof in which pellets can also be used as a fuel, in which case the backflow of combustion air can be prevented and the adhesion of soot can be reduced.

The object of the present invention is also to provide a natural combustion stove and a method thereof, which can effectively prevent the adhesion of soot to the glass window of the combustion chamber and sufficiently enjoy the fluctuation of the internal flame. Once ignited, it is only necessary to manage the fuel supply, and it is possible to automatically burn at a stable temperature and amount of heat even though it is non-powered and non-powered, and it is a natural combustion that is convenient for heating, cooking and directing. In addition to providing a stove and its method, it is to provide a natural combustion stove and its method which are excellent in maintainability and convenient for storage and transportation.

The inventor of the present application has examined the above-mentioned problems. As a result, in the wood stove, by providing the main body airflow guide chamber for extending the distance inside the combustion chamber from the air supply port to the exhaust port, that is, the flow path of the airflow, it was possible to realize combustion like a fireplace. In addition, in order to make it possible to use not only wood fuel but also pellets as fuel, we have developed a detachable pellet storage and combustion attachment, and made the wood stove a specification that this attachment (hereinafter referred to as "pellet box") can be attached and detached. , It was confirmed that it can also be used as a pellet stove.

Furthermore, by making the structure of the pellet box special, it was possible to completely prevent the backflow of the airflow and prevent the glass window of the combustion chamber from becoming dirty with soot, and it was ignited once. After that, it was possible to automatically burn at a stable temperature and amount of heat, and it was possible to realize a natural combustion stove that is convenient for heating, cooking, and directing. Then, the present invention was completed based on these results. That is, the invention claimed in the present application, or at least the invention disclosed as a means for solving the above problems, is as follows.

[1] A supply unit that supplies and supplies fuel for natural combustion, a main body combustion chamber in which combustion is performed in communication with the supply unit, and an exhaust from which the airflow from the main body combustion chamber is finally discharged. A main body airflow guiding chamber for extending the flow path of the airflow is provided between the main body combustion chamber and the exhaust part, and the main body airflow guiding chamber is above the main body. A front flow side vent between the combustion chamber and the wake side vent between the exhaust section is provided at the bottom, and a window through which the internal flame can be seen is provided in the main body combustion chamber. A natural combustion stove that is characterized by that.
[2] The main body airflow guiding chamber is provided back to back with the back surface of the main body combustion chamber, and the exhaust part is provided in contact with the main body airflow guiding chamber and also in contact with the main body combustion chamber and the supply part. The natural combustion stove according to [1], which is characterized in that it is used.
[3] The supply unit is characterized in that an attachment (hereinafter referred to as "pellet box") for storing, supplying, and burning pellet fuel is detachably formed, [1] and [2]. ] The natural combustion stove described in any of.
[4] The natural combustion stove according to [3], wherein the pellet box is attached as a detachable attachment.
[5] The pellet box is a storage unit for storing pellet fuel, a pellet amount adjusting means for adjusting the supply amount of pellet fuel due to natural drop from the storage unit, and combustion in which the supplied pellet fuel is burned. The natural combustion stove according to any one of [3] and [4], which comprises a part.

[6] The combustion unit of the pellet box includes an air supply port, a main combustion unit in which pellet fuel is burned by air supply from the air supply port, and auxiliary combustion provided on the side of the main combustion unit. The sub-combustion part is made up of parts, and the sub-combustion part is reduced in size by combustion, and the pellet fuel (hereinafter referred to as "burning fuel") that passes through the lattice structure (hereinafter referred to as "grate") forming the main combustion part to the side. It is equipped with a grid structure with a narrower interval than the grate (hereinafter referred to as "the grid") for storing the pellet box, and when the pellet box is attached to the natural combustion stove, the main combustion part is the same. The natural combustion stove according to [5], which is formed so as to communicate with the main body combustion chamber.
[7] The natural combustion stove according to [6], wherein the sub-combustion portion is formed with an inclination toward the main combustion portion.
[8] The natural combustion stove according to [7], wherein the sub-combustion portion and the ash receiving portion below the sub-combustion portion are shielded from each other by the bottom of the sub-combustion portion.
[9] The combustion unit is provided with an air supply induction structure forming a flow path for narrowing down the supply air from the air supply port and directly introducing the air supply into the main body combustion chamber [6]. , [7], [8]. The natural combustion stove according to any one of [7] and [8].

[10] The air supply induction structure is characterized in that when the pellet box is attached to the natural combustion stove, the air supply is induced so as to hit the window installation surface of the main body combustion chamber. , [9] The natural combustion stove.
[11] The natural combustion stove according to any one of [6], [7], [8], [9], and [10], wherein the bottom of the air supply port is, that is, the grid. ..
[12] [1], [2], [3], [4], [5], [6], characterized in that at least one of the following <C1> and <C2> is provided. The natural combustion stove according to any one of [7], [8], [9], [10], and [11].
<C1> Oven provided below the main body combustion chamber <C2> Top lid provided on the upper surface of the main body combustion chamber [13] The four-leg stable installation structure or the four-leg horizontal installation structure described in Japanese Patent No. 3594299 is used as a leg. [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], which are characterized by being used in the part. , [11], [12]. The natural combustion stove according to any one of [11] and [12].

[14] [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12] , [13] A removable pellet box that can be used for the spontaneous combustion stove, wherein the pellet box is an attachment for storing, supplying, and burning pellet fuel, and can be used for pellet fuel. The pellet comprises a storage unit for storing, a pellet amount adjusting means for adjusting the supply amount of pellet fuel due to a natural fall from the storage unit, and a combustion unit in which the supplied pellet fuel is burned. box.
[15] [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13] In the method of using the described natural combustion stove as a pellet stove, the pellet box is mounted on the natural combustion stove, and ignition of the pellet fuel by any of the following <F1>, <F2>, and <F3> is performed. A method of using a natural combustion stove, which is characterized in that combustion is continued in a predetermined temperature band by no power and no power supply thereafter.
<F1> Spontaneous ignition by bonfire generated by combustion with the preceding combustion fuel <F2> Ignition by ignition means outside the invention in a state where the natural combustion stove is preheated by combustion with the combustion fuel <F3> Invention Ignition by the external ignition means of the present invention in a state where the natural combustion stove is preheated by the external ignition means [16] The temperature band is 300 ± 15 ° C., and the temperature range is within 15 minutes after ignition. The method of using a natural combustion stove according to [15], which is characterized by reaching.

Since the natural combustion stove of the present invention, the method of using the stove, and the pellet box are configured as described above, it is possible to solve each of the above-mentioned problems and obtain various effects. First, according to the natural combustion stove of the present invention, a fireplace-like combustion is realized by providing a main body airflow guide chamber for extending the distance inside the combustion chamber from the air supply port to the exhaust port, that is, the flow path of the airflow. Can be done. That is, reducing soot and burning fuel efficiently, changing the amount of oxygen by adjusting the balance of intake and exhaust to change the way firewood burns and fluctuates, and further increases heat storage. Part or all can be realized.

Further, according to the invention of the pellet box, which is a pellet storage and combustion attachment that can be attached to and detached from the natural combustion stove, not only firewood but also pellets can be used as fuel, and a combined type natural combustion stove can be provided. Further, due to the characteristic structure of the pellet box of the present invention, the natural combustion stove of the present invention can be used in a state where the backflow of the airflow can be completely prevented and the glass window of the combustion chamber can be prevented from being contaminated with soot. You can fully enjoy the fluctuation of the flame in the combustion chamber, and you can enhance the effect.

Further, according to the natural combustion stove of the present invention, the method of using the stove, and the pellet box, it is possible to automatically burn at a stable temperature and calorific value once ignited, especially when used as a pellet stove. It is convenient as a heating tool and as a production tool. Therefore, it can be burned to the end without any operation other than refueling, and it is easy to handle and very convenient. Moreover, since a stable temperature and amount of heat can be obtained, it is convenient when using this stove for cooking, for example, in the case of a configuration equipped with an oven.

Further, the natural combustion stove of the present invention has excellent maintainability and is convenient for storage and transportation. For example, the natural combustion stove of the present invention provided with characteristic legs can be stably installed even when the installation location is uneven and unstable. In addition, the pellet box is easy to put on and take off, and it is convenient to clean it after use. In addition, since it can be used as a wood stove, the residual heat can be used for preheating when it is used as a pellet stove with pellet fuel after the fact.

It is a conceptual diagram which shows the basic structure of the natural combustion stove of this invention, and is the figure which was configured by each view of the front view, the left-right side view, the back view, and the plan view with the window installation surface as the front. It is a figure which shows the flow of the air flow in FIG. It is a perspective view which shows the Example of the natural combustion stove of this invention. It is a perspective view which shows the firewood fuel supply method (the 1) of the example natural combustion stove. It is a perspective view which shows the firewood fuel supply method (the 2) of the example natural combustion stove. It is sectional drawing which shows the internal structure from the front direction in an Example natural combustion stove. It is sectional drawing which shows the internal structure from the left side surface direction in an Example natural combustion stove. It is sectional drawing which shows the internal structure from the back direction in an Example natural combustion stove. It is a top view of the natural combustion stove of an Example. It is a perspective view which shows the Example of the pellet box attached to and detached from the natural combustion stove of this invention. FIG. 8 is a perspective view from the N direction overlooking the IX-IX arrow cross section of the pellet box shown in FIG. It is a perspective view which shows the state which attached the pellet box shown in FIG. 8 to the natural combustion stove of an Example. It is a schematic front view of the XI-XI arrow cross section of the natural combustion stove shown in FIG. 10. FIG. 8 is a plan view of the pellet box according to FIG. 8 and the like. 8 is an explanatory view of the internal structure of the pellet box according to FIG. 8 and the like, and is a cross-sectional view taken along the line BB in FIG. 12A. 8 is an explanatory view of the internal structure of the pellet box according to FIG. 8 and the like, and is a cross-sectional view taken along the line CC in FIG. 12A. 8 is an explanatory view of the internal structure of the pellet box according to FIG. 8 and the like, and is a cross-sectional view taken along the line DD in FIG. 12B. FIG. 8 is an explanatory view of the internal structure of the pellet box according to FIG. 8 and the like, and is a view of the mounted pellet box as viewed from the main body combustion chamber side. It is a photograph figure which shows the action in the sub-combustion part of the pellet box which concerns on an Example (state after passing through a pellet). It is a photographic figure which shows the action in the sub-combustion part of the pellet box which concerns on an Example (the display of the position of a pellet (burning fuel)). It is a photographic figure which shows the action in the sub-combustion part of the pellet box which concerns on an Example (combustion promotion action on the pellet on the main combustion part side). It is a photographic figure which showed the internal structure by opening the top lid of the pellet box which concerns on this Example. Example It is a photograph figure which shows the use state of a natural combustion stove (overview). Example It is a photograph figure which shows the use state of the natural combustion stove (the state of combustion in the main body combustion chamber).

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a conceptual diagram showing the basic configuration of the natural combustion stove of the present invention, with the window installation surface as the front, front view (a), left side view (b), right side view (c), and rear view (d). ) ・ It is a figure composed of each figure of the plan view (e). Further, FIG. 1-2 is a diagram showing the flow of the air flow in FIG. 1. As shown in these figures, the natural combustion stove 10 has a supply unit 1 that supplies and supplies fuel for natural combustion and supplies air, a main body combustion chamber 2 that communicates with the supply unit 1 and performs combustion, and a main body. It is provided with an exhaust unit 3 in which the airflow from the combustion chamber 2 is finally discharged, and a main body airflow guidance chamber 4 for extending the flow path of the airflow is provided between the main body combustion chamber 2 and the exhaust unit 3. The main body airflow induction chamber 4 is provided with a front flow side vent 5 between the main body combustion chamber 2 and the main body combustion chamber 2 at the upper part thereof, and a wake side vent 6 between the main body airflow induction chamber 4 and the exhaust unit 3 at the lower part. The main configuration is that the main body combustion chamber 2 is provided with a window 7 through which the internal flame can be seen. The window 7 can be configured by using heat-resistant glass or the like. The element indicated by reference numeral 9 in the figure is a substructure mainly composed of an ash receiving portion. Further, as a typical fuel for natural combustion used in the present natural combustion stove 10, firewood fuel can be mentioned. The following is mainly about firewood fuel.

In the figure, the window 7 is provided vertically in front of the main body combustion chamber 2, but the present invention is not limited to this. That is, a configuration in which a window is provided on at least one of the left side surface, the right side surface, and the front surface is also within the scope of the present invention. However, if the space above the supply unit 1 is used as a space for mounting the pellet box described later, it is not necessary to dare to provide a window on the right side surface. Further, the main body combustion chamber 2 is provided with an opening / closing door, and the preferred surface for providing the door is a position in contact with the supply unit 1 from the viewpoint of handling the firewood to be supplied. Then, it is preferable that the opening / closing door is provided on the front surface, and the window 7 has a shape on the front surface. In addition to the front, there may be a window on the left side, but even if it is provided on the front, a sufficient effect can be obtained.

In the present natural combustion stove 10 having such a configuration, fuel for natural combustion such as firewood fuel is supplied and air is supplied in the supply unit 1, and combustion based on the fuel supplied in the supply unit 1 is performed in the main body combustion chamber 2. The airflow (including combustion air) F due to combustion rises in the main body combustion chamber 2 and reaches the main body airflow guidance chamber 4 through the front flow side vent 5 provided between the main body combustion chamber 2 and the main body combustion chamber 2. It flows in, flows through the main body airflow guidance chamber 4 toward the wake side vent 6 at the lower part thereof, flows into the exhaust portion 3 through the wake side vent 6, rises in the exhaust portion 3, and is exhausted. Will be done. Further, the flame of combustion inside the main body combustion chamber 2 can be seen through the window 7.

In the natural combustion stove 10, the airflow F in the main body combustion chamber 2 is not exhausted as it is from the exhaust unit, but is circulated inside the main body airflow guide chamber 4 with the flow path of the airflow F extended. Later, it enters the exhaust unit 3 and is exhausted. Therefore, it is possible to obtain a fireplace-like effect of sufficient combustion and heat storage effect due to the long flow path. The natural combustion stove 10 is not a fireplace that is a structure installed inside or outside the building. As will be described later in the examples shown in each figure after FIG. 2, it is a portable stove that can be sufficiently carried by one adult, and its main use is to take it outdoors such as camping. It is used for all.

As described above, the supply unit 1 supplies and supplies firewood fuel. Here, the supplied firewood fuel is ignited and primary combustion is performed, and the incomplete combustion gas generated in the primary combustion is oxygen by the supply air. This causes combustion in the main body combustion chamber 2, that is, secondary combustion. Since the natural combustion stove 10 of the present invention is provided with the main body airflow guide chamber 4 and has a long airflow flow path, it is advantageous for complete combustion of the supplied fuel, and sufficient and good combustion is performed.

Further, the firewood fuel can be supplied not only in the supply unit 1 but also in the main combustion chamber 2. This is a method of opening the opening / closing door provided in the main body combustion chamber 2 and supplying firewood fuel into the main body combustion chamber 2. If the opening / closing door is vertically long, it is convenient to put firewood vertically in the main body combustion chamber 2, and it is possible to freely perform horizontal stacking and vertical stacking as appropriate for combustion. That is, the main body combustion chamber 2 is not limited to the secondary combustion. When the firewood fuel is directly put into the main body combustion chamber 2, the primary combustion and the subsequent secondary combustion are performed in the same chamber. The conventional camping wood stove is a method of stacking firewood horizontally, but the natural combustion stove 10 of the present invention can enjoy vertical and horizontal variations by stacking firewood vertically.

The airflow F due to combustion rises in the main body combustion chamber 2. Therefore, the flame of combustion fluctuates while extending vertically, and the state can be seen through the window 7. As shown in the figure, the main body combustion chamber 2 and the exhaust unit 3 are partially in surface contact with each other, and the heat in the main body combustion chamber 2 is easily transferred to the exhaust unit 3. Further, the exhaust unit 3 is also in surface contact with the supply unit 1 in which the ignition and primary combustion of the firewood fuel is performed, and the heat thereof is easily transferred to the exhaust unit 1. That is, the main body airflow guidance chamber 4 is provided back to back with the back surface of the main body combustion chamber 2, and the exhaust unit 3 is provided in contact with the main body airflow guidance chamber 4 and also in contact with the main body combustion chamber 2 and the supply unit 1. It is a configuration that is.

Therefore, a sufficient updraft is generated in the exhaust unit 3, and a state in which exhaust is promoted is formed. As described above, the airflow F rising in the main body combustion chamber 2 flows into the main body airflow guidance chamber 4 through the front flow side vent 5 provided near the ceiling, and heads toward the wake side vent 6 at the lower part thereof. It flows downward, flows into the exhaust section 3 through the wake side vent 6, rises in it, and is exhausted. The flow of this airflow F is to generate an updraft in the exhaust section 3 and promote exhaust. It is promoted by state formation.

The main body airflow guide chamber 4 is an element for extending the flow path of the airflow F, but the specific structure is not limited as long as the structure can extend the flow path. However, as shown in Examples described later in FIG. 2 and the like, the main body airflow induction is adjacent to / in contact with the main body combustion chamber 2 formed by partitioning the inside of a substantially rectangular parallelepiped with a wall structure or a partition plate. By setting the room 4, a sufficient and good effect can be obtained. As shown in (e) in the figure, it is preferable that the cross-sectional area of the main body airflow guide chamber 4 is smaller than the cross-sectional area of the exhaust portion 3. This is because the flow of airflow becomes smooth.

As described above, the front flow side vent 5 of the main body airflow guide chamber 4 is provided at the upper part, and the wake side vent 6 is provided at the lower part, also to make the flow of the airflow F smoother. .. With this configuration, the airflow F generated by combustion in the main body combustion chamber 2 rises in the same chamber 2, then falls in the main body airflow induction chamber 4 that flows in, and rises in the final exhaust section 3, which is largely U. Form a turn-like flow. Then, when looking up to the end of the exhaust unit 3 by the main body airflow guidance chamber 4 and the exhaust unit 3 having the partition structure described above, a flow path that is approximately twice the indoor vertical dimension of the main body combustion chamber 2 is added to the main body combustion chamber 2. This will result in a considerable extension of the distribution channel.

The specific shape of the front flow side vent 5 is not limited, but as shown in (d) in the figure, it can be preferably a rectangular gap extending in the horizontal direction with an appropriate dimension. Further, the specific shape of the wake side vent 6 is not limited, but as shown in (c) in the figure, a rectangular gap having an appropriate size can be preferably used. In short, any shape may be used as long as it can make the flow of airflow to the end of the exhaust portion 3 smoother.

Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited to the size and other specific configurations and specifications in the examples.
FIG. 2 is a perspective view showing an embodiment of the natural combustion stove of the present invention. Further, FIG. 3 is a perspective view showing a firewood fuel supply method (No. 1) of the natural combustion stove of Example, and FIG. 3-2 is a perspective view showing a firewood fuel supply method (No. 2) of the natural combustion stove of Example. As shown in these figures, the natural combustion stove 210 has a supply unit 21 for supplying and supplying fuel W, a main body combustion chamber 22 communicating with the supply unit 1 for combustion, and a main body combustion chamber. It is provided with an exhaust unit 23 in which the airflow from the 22 is finally discharged, and a main body airflow guidance chamber for extending the flow path of the airflow between the main body combustion chamber 22 and the exhaust unit 23 (these figures). (Not shown in these figures) is provided, and the main body airflow induction chamber has a front flow side vent (not shown in these figures) between the main body combustion chamber 22 and the main body combustion chamber 22 at the upper part, and an exhaust part 23 at the lower part. A wake side vent (not shown in these figures) is provided between the two, and the main body combustion chamber 22 is provided with a window 27a or the like through which the internal flame can be seen. In this embodiment, the supply unit 21 is also provided with the window 27b.

The lower structure 29 of the natural combustion stove 210 of this embodiment includes an ash receiving portion (not shown in these figures) that receives ash after fuel combustion falling from the main body combustion chamber 22 and the like, an oven 29V, and a leg portion 29F. It is configured in preparation. In particular, by providing the oven 29V, the stove 210 can be used not only for heating but also for cooking. This effect is even higher when used as a pellet stove with a pellet box, which will be described later, attached. This is because when used as a pellet stove, it has a higher stabilizing effect on the amount of heat and the temperature range.

Further, an openable and closable upper lid 221 is provided on the upper surface of the main body combustion chamber 22. When the upper lid 221 is closed, it is possible to cook by placing a pot or the like on it, and when the upper lid 221 is open, the flame in the main body combustion chamber 22 is also used for baking or roasting. Cooking is possible. The element overhanging the upper side of the main body combustion chamber 22 is a shelf 222, on which cooking utensils, foodstuffs before and after cooking, and the like can be placed. The shelf 222 can be folded or stored in the main body combustion chamber 22 when not in use.

The main body combustion chamber 22 is provided with an opening / closing door 223, and the opening / closing door 223 is provided with a window 29a. As shown in FIG. 3, the firewood fuel W is supplied from the opening / closing door 213 of the supply unit 21 and is ignited for primary combustion. The firewood supply here is done horizontally. On the other hand, as shown in FIG. 3-2, the firewood fuel W can also be supplied from the opening / closing door 223 of the main body combustion chamber 22. As shown in the figure, the firewood supply here can be performed by vertical stacking. Both the window 29a and the window 29b provided in the supply unit 21 can be formed of a translucent material such as heat-resistant glass so that the state of combustion inside can be seen. In particular, through the window 29a, which is a large vertical window, the fluctuation of the flame inside the main body combustion chamber 22 can be clearly seen, and an appearance like a fireplace and a staging effect can be provided.

The number and installation positions of the air supply ports 214, 215, etc. for adjusting the intensity of combustion are not limited to the illustrated examples, and can be appropriately designed. The effect of the fireplace has already been mentioned, but in addition, depending on the fireplace, there are many stoves that are devised to burn over a long distance so as to perform tertiary combustion or quaternary combustion in order to burn efficiently and reduce soot. The balance of intake and exhaust can be adjusted to adjust the burning time and temperature. By adjusting them, the amount of oxygen changes, and the way firewood burns and fluctuates. The natural combustion stove 210 of this embodiment is provided with two air supply ports for primary combustion and two air supply ports for secondary combustion, for a total of four air supply ports. Therefore, there are four types of air supply adjustment patterns. When not used as a pellet stove, the air supply port on the primary combustion side is closed to suppress the amount of oxygen supplied, and combustion can be performed for a long time.

The natural combustion stove 210 of this embodiment has a handle 219 or the like, which is convenient for manual transportation and is suitable for outdoor use. Incidentally, the size of the stove 210 of this embodiment is a specification of width 36 × depth 32 × height 73 (cm) and a total weight of about 22 kg. Of course, the design can be changed as appropriate. Further, a chimney connection portion 239 is provided at an upper position of the exhaust portion 23, and a chimney can be added to this portion. In this example, five chimney members are provided, and these can be stored in the exhaust unit 23 and the main body combustion chamber 22 when not in use. Further, in this embodiment, a structural design such as easy attachment / detachment of replacement parts is also made in consideration of maintenance.

Further, the natural combustion stove 210 of this example is characterized in that the leg portion 29F uses the four-leg stable installation structure or the four-leg horizontal installation structure described in Japanese Patent No. 3594299. Of course, the structure is not limited to the structure in which the legs of the present invention are applied, but the legs 29F of this example are convenient when installed in a place where it is difficult to level, such as an uneven ground or a slope. The main leg portion 29F has a structure in which the workpiece is supported by four legs, and is composed of two legs fixed to the workpiece and two legs connected by a curved portion having an arc. It is a four-leg stable installation structure or a four-leg horizontal installation structure in which the workpiece is connected so as to be slidable in the arc direction.

FIGS. 4, 5 and 6 are cross-sectional views showing the internal structure of the natural combustion stove according to the embodiment from each direction (front direction, left side surface direction, back surface direction). Both are perspective views from an oblique left direction. Further, FIG. 7 is a plan view of the natural combustion stove of the example. These figures are views of a state in which a pellet box, which will be described later with reference to FIG. 8 and the like, is attached. In this example of the configuration shown in the figure, in the natural combustion stove 210, the airflow in the main body combustion chamber 22 is not exhausted as it is from the exhaust unit 23, but the main body is in a state where the flow path of the airflow is extended by the main body airflow induction chamber 24. After flowing through the inside of the airflow guide chamber 24, it enters the exhaust unit 23 and is exhausted.

That is, the airflow rises while rotating in the main body combustion chamber 22, passes through the front flow side vent 25 from the ceiling portion, enters the main body airflow guidance chamber 24 behind, and flows backward from the floor portion of the main body airflow guidance chamber 24. It enters the exhaust section 23 through the side vent 26, rises in the exhaust section 23, and is exhausted. With such an extended airflow flow path, it is possible to obtain a fireplace-like effect of sufficient combustion and heat storage effect.

The supply unit 21 supplies and supplies firewood fuel. Here, the supplied firewood fuel is ignited to perform primary combustion, and the incomplete combustion gas generated in the primary combustion is generated by oxygen from the supply air to the main body combustion chamber. Combustion at 22, that is, secondary combustion is performed. Since the natural combustion stove 210 of the present invention is provided with the main body airflow induction chamber 24, the flow path of the airflow is extended, so that the heat storage property is enhanced, which is advantageous for the complete combustion of the supplied fuel, and is sufficient and good. Burning is done. Further, the cross-sectional area in the flow path direction of the main body airflow guide chamber 24 can be configured to be slightly larger than the cross-sectional area in the flow path direction of the exhaust unit 23. As a result, the flow of airflow from the supply unit 21 to the end of the exhaust unit 23 can be promoted and smoothed.

Since the primary combustion in the supply unit 21 heats the exhaust unit 23 that is in contact with the exhaust unit 23 immediately behind it, the updraft in the exhaust unit 23 is promoted, which also promotes the formation of the air flow from the supply air to the exhaust gas. In this example, the planar / three-dimensional structure of the entire natural combustion stove 210 itself has an effect of preventing backflow. A heat shield plate is provided on the inner surfaces of the main body combustion chamber 22, the main body airflow induction chamber 24, and the exhaust unit 23. In FIG. 7, the boundary between the main body combustion chamber 22 and the main body airflow guidance chamber 24 is shown by a broken line.

FIG. 8 is a perspective view showing an example of a pellet box attached to and detached from the natural combustion stove of the present invention. Further, FIG. 9 is a perspective view from the N direction overlooking the IX-IX arrow cross section of the pellet box shown in FIG. 8, and FIG. 10 is a perspective view showing a state in which the pellet box shown in FIG. 8 is attached to the natural combustion stove of the embodiment. , And FIG. 11 is a schematic front view of the XI-XI arrow cross section of the natural combustion stove shown in FIG. As shown in these figures, the pellet box 28, which is an attachment for storing, supplying, and burning pellet fuel, is basically formed to be removable from the supply portion 21 of the natural combustion stove 210. The configuration is as follows.

The pellet box 28 may be handled as an attachment independent of the natural combustion stove 210, but may be handled as a detachable attachment attached to the natural combustion stove 210, or a part of the natural combustion stove 210. It may be a stove configuration. In any case, as can be seen by contrasting FIG. 10 and FIG. 2 above, the pellet box 28 is attached to the supply unit 21 by fitting the pellet box 28 into the air supply port 214 of the supply unit 21 from above. It is possible only by performing a predetermined fixing by screwing or the like.

Therefore, the lower portion, which is the fitting portion of the pellet box 28, should be in a form that exactly fits the air supply port 214 of the supply portion 21. The pellet box 28 can be removed by releasing the predetermined fixing and pulling it upward. Although FIG. 11 is the same diagram as in FIG. 4, the former explains the airflow inducing action mainly inside the natural combustion stove 210 by combining the pellet box 28 and the latter with FIGS. 5 and 6. Further, also in FIGS. 5 to 7 above, a state in which the pellet box 28 is attached to the natural combustion stove 210 is shown.

Of these, FIG. 5 is a view of a part of the pellet box 28 as viewed from inside the main body combustion chamber 22. When the natural combustion stove 210 is not used as a pellet stove, the pellet box 28 is not installed as a matter of course, and the main body combustion chamber 22 and the supply unit 21 are largely opened as an opening 228 between the supply unit and the main body combustion chamber. , The firewood fuel can be supplied horizontally from the supply unit 21. However, when the pellet box 28 is installed, as shown in the figure, its substructure (combustion section described later, more specifically, the main combustion section-grate) is located exactly at the opening 228 between the supply section and the main body combustion chamber. It has a shape that forms a boundary with the main body combustion chamber 21.

Further, in FIG. 6 above, the pellet box 28 is attached to the supply unit 21 in contact with the exhaust unit 23, and the pellet box 28 is also in contact with the exhaust unit 23, and the pellet box 28. Has been shown to be able to be formed to be exactly as high as the height of the natural combustion stove 210 when fitted. Further, FIG. 7 above shows that the pellet box 28 has a shape to be mounted in conformity with the shape of the supply unit 21.

In the case of a spontaneous combustion type pellet stove, it is generally necessary to preheat the entire stove to smooth the flow of airflow inside the stove from the intake port to the end of the exhaust section before igniting, otherwise it is exhausted. There is a danger of smoke and flames flowing back. The natural combustion stove 210 of the present invention has a structure in which the above-mentioned airflow flow path is extended, and the main body combustion chamber 22 and the supply unit 21 in which combustion is performed are brought into contact with the exhaust unit 23, and the updraft in the exhaust unit 23 is provided. The structure that promotes generation promotes proper airflow formation inside. Even when the pellet box 28 is attached and the natural combustion stove 210 is used as the pellet stove, the combustion in the pellet box 28 heats the exhaust portion 23 which is in contact with the back immediately, so that the supply air to the exhaust by natural convection and updraft are used. Smooth airflow formation is promoted.

As shown in FIGS. 8 and 9, the pellet box 28 includes a storage unit 281 for storing pellet fuel, a pellet amount adjusting means 282 for adjusting the supply amount of pellet fuel due to a natural fall from the storage unit 281 and the supplied pellets. It is composed of a combustion unit 283 in which fuel is burned. The pellets can be stored inside by opening the upper lid of the storage portion 281. Further, a storage amount confirmation window 281S for confirming the storage amount may be provided. The size of pellets, that is, wood pellet fuel, is usually about 6 mmφ × 30 mm. In the storage section 281 of the pellet box 28 of this example, a maximum of about 1.7 kg of pellets can be stored, and the maximum amount of storage allows the combustion state to be continued for 1 hour or more. It is not limited and can be designed as appropriate.

As the pellet amount adjusting means 282, as shown in the figure, a pellet amount adjusting plate that partitions between the storage portion 281 and the combustion portion 283 of the pellet box 28 can be preferably used. The pellet amount adjustment plate is a substantially rectangular plate with a hook-shaped rear end. By appropriately using the mounting method of inserting downward, the falling of pellets from the storage unit 281 to the combustion unit 283 can be blocked, the gap width between the storage unit 281 and the combustion unit 283 can be freely adjusted, or fully opened. Can be done. The optimum gap width is such that the bottom layer portion of the pellet group from above can be pressed from the side to suppress the fall.

In this way, the pellet box 28 adjusts the supply and stop of the pellets stored and stored in the storage section 281 to the combustion section 283 by using the pellet amount adjusting means 282, and the combustion section 283 naturally adjusts from above. Burn the pellets that have been dropped and supplied. The details of the combustion method will be described later with reference to FIGS. 12 and 13.

12A to 13E are views for explaining the internal structure of the combustion portion of the pellet box. Of these, FIG. 12A is a plan view of the pellet box according to FIG. 8 and the like, and FIG. 12B is an arrow BB in FIG. 12A. FIG. 12C is a sectional view taken along the line CC in FIG. 12A. Further, FIG. 13D is a cross-sectional view taken along the line DD in FIG. 12B, and FIG. 13E is a view of the mounted pellet box viewed from the main body combustion chamber side. As shown in these figures, particularly FIG. 12B, the combustion unit 283 of the pellet box 28 includes an air supply port 284, a main combustion unit 285 in which pellet fuel is burned by air supply from the air supply port 284, and main combustion. It is basically composed of a sub-combustion unit 286 provided on the side of the unit 285.

Then, as shown in FIGS. 12C, 13D, and 13E, the sub-combustion section 286 is reduced in size by combustion, and the pellet fuel (stove) that has passed laterally through the lattice structure (grate) 285G forming the main combustion section 285. It is equipped with a grid structure (a grid) 286G that is narrower than the grate 285G for storing the chemical fuel), and the pellet box 28 is mainly used when it is attached to the natural combustion stove 210. The characteristic configuration is that the combustion unit 285 is formed so as to communicate with the main body combustion chamber 22.

With this configuration, in the combustion unit 283 of the pellet box 28, the pellet spontaneous drop supply from the storage unit 281 is performed while the supply amount is adjusted by the pellet amount adjusting means 282, the air is supplied from the air supply port 284, and appropriately. By ignition or preheating, pellet combustion in the main combustion unit 285, that is, pellet combustion on the grate 285G is performed. The pellets are gradually reduced in size by combustion in the main combustion unit 285. Then, it will be in a state where it can pass through the gap of the grate 285G.

Since the sub-combustion section 286 having the grid structure 286G, which has a grid structure narrower than that of the grate 285G, is provided on the side of the main combustion section 285, the reduced size fuel has a gap in the grate 285G. It passes through and moves to the side of the sub-combustion unit 286, and combustion is continued in a state where the sub-combustion unit 286 is placed on the grid 286G as it is. Since the grid 286G forms the bottom of the air supply port 284, it directly receives the air supply from the air supply port 284. Therefore, the combustion of the burnt fuel on the grid 286G is good and actively continued, with the effect that the combustion promotes the combustion of the pellets in the main combustion section 285 through the grate 285G.

The main combustion unit 285 of the combustion unit 283 can be divided into a lower portion facing the rostrum of the main body supply unit 21 and a middle portion in between, with the position where ignition is performed directly under the pellet amount adjusting means 282 as the upper portion. The upper part is the area where the falling pellets are ignited by preheating or ignition means and combustion starts, and the middle part is the area where the pellets that are falling and becoming blazing at the same time as the combustion progresses are stronger due to the air supply from the air supply port 284. The area where combustion occurs, and the lower part is the area where the ignited pellets, which have been further lowered due to the progress of combustion, are still strongly burned by the air supply from the air supply port 284, but are ignited and further incinerated toward the end of combustion. Is.

As shown in FIGS. 12C and 13E, the grate 285G of the main combustion unit 285 can have a three-stage configuration of upper, middle, and lower, and each stage generally corresponds to the above-mentioned upper part, middle part, and lower part. Therefore, in the upper part of the grate 285G, the falling pellets are ignited by preheating or ignition means and combustion starts, in the middle part, the falling pellets burn vigorously at the same time as the combustion progresses, and further in the lower part. The descending pellets still burn strongly, but become ignited and further incinerated toward the end of combustion. After the combustion is finished, the ash falls through the rostrum to the ash receiving part.

As described above, it is desirable that the pellets ignite immediately and start combustion as soon as they fall from the storage unit 281 to the combustion unit 283. However, although the upper part ignites and starts burning first, and the middle part and the lower part where the fall is made are satisfactorily burned, the ignition and the start of combustion in the upper part are not smoothly performed. Therefore, in the present invention, it is decided to provide the sub-combustion unit 286 on the side of the upper part of the main combustion unit 285, and on the side of the upper part of the grate 285G in FIG. 12C and the like. That is, it is not a grate 285G facing the main body combustion chamber 22 side, but a sub-combustion portion 286 composed of a grid 286G provided on the intake port 284 side across the grate 285G facing the intake port 284 side.

With this configuration, the miniaturized pellets (burned fuel) that have passed through the grate 285G are satisfactorily burned in the sub-combustion section 286 composed of the grate 286G by the air supply from the air supply port 284, but the heat generated by the pellets. And flames facilitate and promote ignition and combustion of pellets in the upper part (upper part) of the main combustion part 285 through the grate 285G. Then, the pellets at the upper part (upper part) gradually become smaller due to smooth combustion, and naturally descend to the middle part (middle part) and lower part (lower part), and combustion is also promoted, so the movement of the pellets. It also becomes smooth and the occurrence of pellet clogging is prevented.

The size of the gap (slit) between the grate 285G constituting the main fuel section 285 and the grid 286G constituting the sub-combustion section 286 is the size of the pellet used and the unignited / unburned / low of the main combustion section 285. Combustion state It can be appropriately designed in consideration of the size to be retained as the fuel to be burned in order to continue the combustion promoting effect of the pellets. If the slit is too narrow, pellets and fuel will be clogged, and if it is too wide, it will spill out immediately, and the supplied air will only pass through, resulting in poor combustion and secondary combustion. The effect of promoting the combustion of unignited, unburned, and low-burning pellets by the part cannot be obtained. The slit size is designed in consideration of these points.

As shown in FIGS. 12B and 9 and 11 above, the main combustion portion 285 of the pellet box 28 according to the present embodiment has a shape in which the main combustion portion 285 narrows downward and the cross-sectional area is narrowed. According to such a shape, it is possible to prevent the pellets from spilling due to the gradual reduction in the size of the pellets as the combustion progresses. That is, the pellets that naturally fall from the storage section 282 are filled in the main combustion section 285 as a pellet layer composed of a plurality of pellets, and do not easily fall downward, and this filled state is maintained. To. This is because the inner surface of the grate 285G, which is the outer shell of the main combustion portion 285, presses against the pellet layer.

The side surface shape of the main combustion part 285 is reduced downward so that the applied pressure can be maintained even as the pellets are reduced in size over the upper part, the middle part, and the lower part of the main combustion part 285. .. In addition to the effect of preventing the pellets from spilling, air is supplied from the air supply port 284 to the pellets that are kept in position in the main combustion section 285 while being reduced in size, that is, the pellets do not escape (spilling). Such a shape is effective because combustion can be continued while being fixed in the (not) state.

14 to 16 are photographic views showing the action in the sub-combustion portion of the pellet box according to the embodiment. In order, FIG. 14 shows the position of the pellet (burned fuel) after passing through the pellet, and FIG. 16 shows the combustion promoting action on the pellet on the main combustion part side. As shown in these figures, particularly FIG. 15, the sub-combustion portion 286 of the pellet box 28, that is, the grid 286G, can be formed with an inclination toward the main combustion portion 285. The inclination is an inclination having a depression angle in the direction of the main combustion portion 285. As described above, the sub-combustion unit 286 is provided corresponding to the upper position of the main combustion unit 285, that is, the position where the pellet should be ignited. It should be noted that also in FIGS. 9, 11 and 12B described above, the configuration in which the sub-combustion portion 286 is formed at an angle inclined toward the main combustion portion 285 is shown.

With this configuration, the pellets, that is, the fuel P, which spills through the gap of the grate 285G and spills into the sub-combustion section 286 due to the miniaturization by combustion, is moved away from the main combustion section 285 and the grate 285G (FIG. 14). It will stay in a position close to the grate 285G without moving to (Fig. 15). Then, the air is directly supplied from the air supply port 284 immediately above and active combustion occurs (Fig. 16), and the flame and heat generation promote the ignition and combustion of the pellets on the immediate side of the grate 285G. ..

Even if the fuel P, whose pellets are reduced in size due to combustion, passes through the gap of the grate 285G and continues to burn in the sub-combustion unit 286, it does not initially pass through the gap of the grate 286G, so that it is the main combustion. The ignition / combustion promoting effect on the pellets on the part 285 side can be obtained for a while. The fuel, which has been reduced in size to the extent that combustion progresses and passes through the gap of the grid 286G, passes through the gap of the grid 286G and naturally falls to the bottom of the sub-combustion portion. The gap (slit) spacing of the grid 286G may be designed in consideration of the smoothness of air supply and the size of the fuel that can maintain the ignition / combustion promoting action.

The ignition / combustion promoting action of the sub-combustion section 286 that contributes to the unignited / unburned / low-burning state pellets has been described above, but this action is auxiliary. That is, the ignition / combustion promoting action on the unignited / unburned / low-combustion state pellets is mainly obtained by the combustion heat from the lower part or the middle part of the main combustion part 285. However, although it is auxiliary, the effect of the sub-combustion unit 286 is large, and with or without it, the ignition / combustion promoting effect is considerably different. Further, the bottom of the intake port 284 is the grid 286G, and therefore, it is easy to see and enjoy how the fuel is burned on the grid 286G at any time and affects the main combustion portion 285. There is also a visual effect.

As shown in FIGS. 9 and 11 above, the pellet box 28 according to the present embodiment has a configuration in which the sub-combustion portion 286 and the ash receiving portion 29T below the sub-combustion portion 286 are shielded from each other by the sub-combustion portion bottom portion 287. be able to. That is, it is not necessary to have a structure in which the lower part of the grid 286G is open toward the ash receiving portion 29T, and the ash is sent out to the main body combustion chamber 22 side by the air flow without being accumulated in the bottom portion 287 of the sub-combustion portion. It is considered that the structure in which the bottom portion of the sub-combustion unit 286 is cut off limits the air flow path and facilitates the air flow control to the main body combustion chamber 22 side.

As shown in FIGS. 4, 5, 7 and the like above, the pellet box 28 is formed so that the main combustion unit 285 communicates with the main body combustion chamber 22 when attached to the natural combustion stove 210. As a result, the airflow due to pellet combustion flows through the flow path of the main body combustion chamber 22-main body airflow induction chamber 24-exhaust section 23, and the flame due to combustion can also be seen through the window 27a of the main body combustion chamber 22. Next, a method capable of facilitating the control of such an air flow and obtaining another effect will be described.

As shown in FIGS. 9, 12C, 13D, and 13E, the combustion section 283 of the pellet box 28 according to this embodiment has a flow path for narrowing down the supply air from the air supply port 284 and directly introducing it into the main body combustion chamber 22. The configuration may be such that the supply air induction structure 288 is provided. The supply air induction structure 288 does not communicate with the storage unit 281 and the main combustion unit 285, but communicates with the sub-combustion unit 286 and the intake port 282 on the front flow side thereof, and is opened to the main body combustion chamber 22 by a slit. Therefore, the air sucked from the air supply port 282 enters the main air supply induction structure 288 from the grid 286G of the auxiliary combustion unit 286, and the grid (air flow grid) provided on the main body combustion chamber 22 side. It flows into the main body combustion chamber 22 through 288G.

FIG. 17 is a photographic view showing the internal structure of the pellet box according to the present embodiment by opening the upper lid. As shown in the figure, the air supply induction structure 288 is provided at one end of the main combustion portion 285 of the pellet box 28 in a form isolated from the storage portion 281 and also in a form isolated from the main combustion portion 285. .. The supply air induction structure 288 is used for inducing the air flow from the intake port 284 to the main body combustion chamber 22, and pellet supply and pellet combustion are not performed inside the air supply induction structure 288.

The supply air induction structure 288 creates an air flow from the air supply port 284 to the main body combustion chamber 22, which is not directly related to pellet combustion, but this allows soot generated by fuel combustion to smoothly flow into the main body combustion chamber 22 and later. Used for next combustion, etc. As illustrated in each figure, the installation position of the air supply induction structure 288 is such that the induction airflow hits the window 27a installation surface of the main body combustion chamber 22 when the pellet box 28 is attached to the natural combustion stove 210. By doing so, it is possible to effectively prevent the adhesion of soot inside the main body. In particular, soot can be prevented from adhering to the window 27a or the like, the transparency of the window 27a or the like can be maintained, and the state of internal combustion such as the fluctuation of the flame can be shown well.

In this embodiment, "the position where the induced airflow hits the window 27a installation surface of the main body combustion chamber 22 when the pellet box 28 is attached to the natural combustion stove 210" is the main combustion as shown in FIG. It is the left end portion of the portion 285. The airflow passing through the air supply induction structure 288 passes through the airflow grid 288G and flows into the main body combustion chamber 22 so as to hit the window 27a installation surface. That is, the airflow is directly blown to the window 27a and is regulated to flow along the wall surface, so that even if soot is about to adhere to the window 27a, it is immediately blown off, so that the soot adhesion to the window 27a is effectively prevented. Will be done. That is, it is desirable that the air supply induction structure 288 is provided at the end of the combustion unit 283 so that the airflow along the inner wall side of the main body combustion chamber 22 can be sent out.

18 and 19 are photographic views showing the usage state of the natural combustion stove of the example, the former is an overview, and the latter is a state of combustion in the main combustion chamber. Both are examples in which the pellet box 28 is attached and used as a pellet stove. As shown in these, the state of pellet combustion can be clearly seen through the window 27a, and in particular, in FIG. 19, it can be seen that the flame is vigorously blown from the pellet box 28 combustion unit 283 side to the main body combustion chamber 22. Further, the flame is blown along the window 27a, and the effect of the air supply induction structure 288 is exhibited.

The natural combustion stove of the present invention can use firewood and pellets at the same time, but it is not necessary. Since the amount of heat is considerably high when both fuels are used in combination, it is more preferable to use only one fuel. When the natural combustion stove 210 is used as a wood stove, it burns at a temperature about 100 ° C. higher than that when pellets are used. Therefore, even if soot is attached, it burns out immediately and does not easily adhere to the window 27a or the like.

In the natural combustion stove of the present invention that can also be used as a pellet stove, the following three items can be mentioned as points that can prevent the backflow of flue gas due to the chimney effect, which tends to be a problem in a normal natural combustion type pellet stove. ..
1) Airflow guidance structure in the pellet box, such as air supply guidance structure.
2) Smooth ignition not only in the middle and lower parts of the pellet box main combustion part, but also in the upper part, continuous maintenance of the void distribution state in the pellet layer by combustion, smooth flow of airflow by it, and thereby intermittent The pellet can fall naturally.
3) The structure of the entire stove, such as the main body airflow guidance chamber and the structure that promotes the generation of updraft in the exhaust section. In addition, the extension of the airflow distribution route due to this.

Further, as shown in FIG. 2 and the like above, the supply unit 21 may be provided with two air supply ports. One of them is an intake port 214 at a place where the pellet box 28 is mounted, and when firewood is used as fuel, air circulates above or beside the firewood. This is the same as the air supply method found in conventional camping wood stoves. On the other hand, in the air supply port 215, the air supply has a structure that circulates above and below the rostrum. In particular, the air that hits from under the rostrum burns firewood and bonfires for a long time. It is effective for combustion when fuel such as firewood accumulates on the bottom. When the pellet box 28 is attached and used as a pellet stove, a higher effect can be obtained by closing the air supply port 215 and using only the air supply port 284.

The pellet box itself having any of the configurations described above with reference to FIGS. 8 to 13E is also within the scope of the present invention. The natural combustion stove of the present invention can also use pellet fuel while basically using fuel for natural combustion such as firewood. Maintenance on both sides of the pellet box is easy and convenient.

Further, in the method of using the natural combustion stove 210 having any of the configurations described above as the pellet stove, the pellet box 28 is mounted on the natural combustion stove 210, and the following <F1>, <F2>, and <F3> are used. A method of using a natural combustion stove, which is characterized in that the pellet fuel is ignited by any of them and then combustion is continued in a predetermined temperature band by no power and no power source, is also within the scope of the present invention.

<F1> Spontaneous combustion by the bonfire generated by the combustion with the preceding firewood fuel By burning the firewood first, the pellets can be ignited by the igniter.
<F2> Ignition by an appropriate invention external ignition means such as a gas burner while the natural combustion stove 210 is preheated by combustion with wood fuel Preheating is performed by the main body (glass window surface) and chimney (exhaust tower). Etc. can be done by heating with a gas burner.
<F3> Ignition by the invention external ignition means in a state where the natural combustion stove 210 is preheated by the invention external ignition means The stove 210 is first burned with firewood, and then the pellets are burned using the residual heat as the preheat.

According to such a method of use, the natural combustion stove 210 can stably hold 300 ± 15 ° C., and more specifically, can stably hold 300 ± 10 ° C. when pellets are used as fuel. Then, the temperature zone can be reached within 15 minutes after ignition, more specifically, about 10 minutes after ignition, and thereafter, the constant temperature state at such a high temperature can be maintained throughout the combustion. In the embodiment, as described above, a maximum of 1.7 kg of pellet fuel can be stored, but by storing the maximum amount, combustion can be continued for about 1 hour and 10 to 20 minutes.

According to the natural combustion stove of the present invention, a method of using the stove, and a pellet box, many advantages can be obtained, such as being able to realize fireplace-like combustion and being able to be used well not only as firewood but also as a pellet stove. Therefore, it is an invention with high industrial applicability in all fields of utilization of a natural combustion stove, including outdoor recreational applications such as camping, manufacturing fields, and all related fields.

1, 21 ... Supply unit 2, 22 ... Main body combustion chamber 3, 23 ... Exhaust unit 4, 24 ... Main body airflow guidance chamber 5, 25 ... Front flow side vent 6, 26 ... Back flow side vent 7, 27a, 27b ... Windows 9, 29 ... Substructure 10, 210 ... Natural combustion stove 28 ... Pellet box 29F ... Legs 29T ... Ash receiving part 29V ... Oven 213 ... Opening and closing door (of supply part)
214, 215 ... Air supply port (of the supply section)
219 ... Handle 221 ... Top lid 222 ... Shelf 223 ... Open / close door (in the main body combustion chamber)
228 ... Supply section-Main body combustion chamber opening 239 ... Chimney connection <Hereafter, 281 to 288G are elements of the pellet box>
281 ... Storage unit 281S ... Storage amount confirmation window 282 ... Pellet amount adjusting means 283 ... Combustion unit 284 ... Air supply port 285 ... Main combustion unit 285G ... Lattice structure (grate) forming the main combustion unit
286 ... Sub-combustion unit 286G ... Lattice structure (lattice) forming the sub-combustion unit
287 ... Sub-combustion bottom bottom 288 ... Air supply induction structure 288G ... Lattice of supply air induction structure (air flow lattice)
F ... Airflow P ... Pellet fuel, fuel fuel W ... Fuel for natural combustion (firewood fuel, etc.)

Claims (16)

A supply unit that supplies and supplies fuel for natural combustion,
A main body combustion chamber in which combustion is performed in communication with the supply unit,
It is equipped with an exhaust unit from which the airflow from the main body combustion chamber is finally discharged.
A main body airflow guide chamber for extending the flow path of the airflow is provided between the main body combustion chamber and the exhaust portion.
The main body airflow guidance chamber has a front flow side vent between the main body combustion chamber and the main body combustion chamber at the top.
A wake side vent between the exhaust and the exhaust is provided at the bottom.
A natural combustion stove characterized in that the main body combustion chamber is provided with a window through which an internal flame can be seen. The main body airflow guide chamber is provided back to back with the back surface of the main body combustion chamber, and the exhaust portion is provided in contact with the main body airflow guide chamber and also in contact with the main body combustion chamber and the supply portion. The natural combustion stove according to claim 1, wherein the stove is characterized in that. The supply unit is one of claims 1 and 2, wherein an attachment (hereinafter referred to as a "pellet box") for storing, supplying, and burning pellet fuel is detachably formed. The described natural combustion stove. The natural combustion stove according to claim 3, wherein the pellet box is attached as a detachable attachment. The pellet box is composed of a storage unit for storing pellet fuel, a pellet amount adjusting means for adjusting the supply amount of pellet fuel due to natural drop from the storage unit, and a combustion unit in which the supplied pellet fuel is burned. The natural combustion stove according to any one of claims 3 and 4, wherein the stove is characterized by being. The combustion part of the pellet box consists of an air supply port, a main combustion part in which pellet fuel is burned by air supply from the air supply port, and an auxiliary combustion part provided on the side of the main combustion part. The sub-combustion section is reduced in size by combustion and stores pellet fuel (hereinafter referred to as "burning fuel") that has passed laterally through the lattice structure (hereinafter referred to as "grate") forming the main combustion section. Therefore, the pellet box is provided with a grid structure with a narrower interval than the grate (hereinafter referred to as "the grid"), and when the pellet box is attached to the natural combustion stove, the main combustion part is the main body combustion chamber. The natural combustion stove according to claim 5, characterized in that it is formed so as to communicate with. The natural combustion stove according to claim 6, wherein the sub-combustion portion is formed with an inclination toward the main combustion portion. The natural combustion stove according to claim 7, wherein the sub-combustion portion and the ash receiving portion below the sub-combustion portion are shielded from each other by the bottom portion of the sub-combustion portion. 6. The natural combustion stove according to any one of 8. The air supply induction structure is characterized in that when the pellet box is attached to the natural combustion stove, the air supply is induced so as to hit the window installation surface of the main body combustion chamber. The natural combustion stove according to 9. The natural combustion stove according to any one of claims 6, 7, 8, 9, and 10, wherein the bottom of the air supply port is, that is, the grid. One of claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 characterized in that at least one of the following <C1> and <C2> is provided. The described natural combustion stove.
<C1> Oven provided below the main body combustion chamber <C2> Top lid provided on the upper surface of the main body combustion chamber Claims 1, 2, 3, 4, 5, 6, 7, 8, 9 characterized in that the four-leg stable installation structure or the four-leg horizontal installation structure described in Japanese Patent No. 3594299 is used for the legs. 10. The natural combustion stove according to any one of 10, 11 and 12. A removable pellet box that can be used for the natural combustion stove according to any one of claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, and 13. The pellet box is an attachment for storing, supplying, and burning pellet fuel.
Reservoir for storing pellet fuel,
Pellet amount adjusting means for adjusting the supply amount of pellet fuel due to natural fall from the reservoir,
A pellet box comprising a combustion part in which the supplied pellet fuel is burned. A method of using the natural combustion stove according to any one of claims 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, and 13 as a pellet stove.
The pellet box is mounted on the natural combustion stove and
The pellet fuel is ignited by any of the following <F1>, <F2>, and <F3>.
After that, a method of using a natural combustion stove, which is characterized in that combustion in a predetermined temperature band is continued by no power and no power supply.
<F1> Spontaneous ignition by bonfire generated by combustion with preceding firewood fuel <F2> Ignition by non-invention ignition means in a state where the natural combustion stove is preheated by combustion with firewood fuel <F3> Invention Ignition by the external ignition means of the present invention in a state where the natural combustion stove is preheated by the external ignition means. The method for using a natural combustion stove according to claim 15, wherein the temperature zone is 300 ± 15 ° C., and the temperature zone is reached within 15 minutes after ignition.

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