JP2007285660A - Wood stove - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wood stove usable even in a urban area, retaining high temperature by accumulating unburnt gas in a secondary combustion chamber without using a catalyst, efficiently burning the unburnt gas by supplying a sufficient amount of air from an exterior, providing a highly efficient heating effect, and at the same time, reducing black smoke of exhaust air.

SOLUTION: A horizontal air supply pipe 17 taking in air flowing in from an air mount regulating valve 14 of a wood input port 15 is provided in a main combustion chamber 11, the horizontal air supply pipe 17 is provided with a plurality of air holes 18 on a side face in an opposite direction of the wood input port 15, and a secondary combustion tube 20 is provided on an upper side of the combustion chamber 11 in a side opposite to the wood input port 15. The secondary combustion tube 20 has a plurality of air amount adjusting pipes capable of adjusting and supplying an outside air amount from a side direction, a connection plate 21 is provided in its lower part, and a convection suppressing plate 25 is provided in its upper part. A secondary combustion chamber 26 is composed between the two plates, and an eddy current forming blade 27 is composed on a wall of an exhaust chamber 25 being a space above the convection suppressing plate 25.

COPYRIGHT: (C)2008,JPO&INPIT

Description

This invention relates to wood-burning stove which wood or the like equipped with a chimney to burn in the furnace body as fuel.

Conventionally, as a wood stove for burning firewood, for example, Patent Document 1 (Patent Publication 2000-46334) below it is known. The wood stove S, as shown in FIG. 8, a main body 1 constituting a combustion chamber 2 which wood is placed, the inlet 3 of wood is provided on the main body 1 is turned on, provided in the main body combustion chamber 2 and a chimney 4 which communicates with. Such, in the wood stove S, in order to prevent including unburned gas in a large amount in the exhaust gas, the two communicating via a communication port 5 a top of the combustion chamber 2 in front of the chimney quartic the combustion chamber 6 is provided, and a platinum catalyst 7 to promote the combustion of the unburned gases in the secondary combustion chamber 6. Thus, to the combustion chamber 2, was charged with wood and burning with a flame, the exhaust gas containing unburned gas generated by the combustion in the combustion chamber 2, because the warm, through the communication port 5 two reaches the next combustion chamber 6, the combustion of the unburned gas is caused to accelerate by a platinum catalyst 7. Therefore, unburned gas contained in exhaust gas is reduced.

As the wood stove is not used a platinum catalyst, there is known Patent Document 2 (JP Publication 2004-77060) below.
The wood stove, as shown in FIG. 9, the flat mounting portion 13 of firewood is placed into the combustion chamber 11 of the body 10 is provided, the main body 10, toward the upper middle mounting portion 13 the inclined air supply pipe 40 obliquely from above having an outlet 41 capable of supplying ambient air, a plurality provided so as to be arranged symmetrically with respect to the center line of the outlet 41 mount portion 13, further, mounting portion towards the upper center of 13, a plurality to the horizontal air supply pipe 50 having an outlet 51 that can supply external air horizontally, are arranged symmetrically with respect to the center line of the outlet port 51 mounting portion 13 provided.

Thus, a catalyst with a simple structure without using, by burning the unburned gas with high efficiency by the supply of sufficient air, is set to reduce the generation of unburned gas, achieving a reduction in manufacturing cost.
Patent Publication No. 2000-46334 Publication Patent Publication No. 2004-77060 Publication

However, in such a conventional wood-burning stove, and the unburned gas is secondary combustion, although the exhaust gas clean, is provided with the A catalytic provided secondary combustion chamber upwardly, complicated structure in parts cost is also high, there is a problem that the production cost is high. Moreover, the method according to the inclined air supply pipe, conditions for suction of air is critical.
The present invention has been made in view of the above problems, without the use of catalysts, allowed to stay unburned gases in the secondary combustion chamber maintained at a high temperature, there by providing sufficient air from the outside unburnt gas effectively burned, to reduce the black smoke of the exhaust and simultaneously obtain a heating effect of high efficiency, and to provide a wood stove as can also be used in urban areas.

To achieve the above object, a wood stove of the present invention includes a main body constituting the combustion chamber of wood is placed, a firewood inlet of firewood provided on the main body is turned on, the combustion chamber provided in the body in the wood stove with a chimney communicating with the secondary combustion tube and further the secondary combustion tube communicating the mounting portion provided firewood to the combustion chamber is mounted, placing portion of firewood inlet It comprises a horizontal air supply pipe to take the air flowing from the air amount adjusting valve, and the horizontal air supply pipe is provided with a plurality of air holes on both sides in the opposite direction of the wood inlet, addition, firewood inlet mounting portion is provided secondary combustion cylinder to the upper opposite side of the combustion chamber, the secondary combustion cylinder has a plurality of the air control pipe can be supplied from a lateral direction to adjust the fresh air amount of air, the mounting of the air control pipe connecting plate at the bottom of the secondary combustion cylinder than the position is, the mounting position of the air control pipe Ri comprises a convection suppression plate in the secondary combustion cylinder at the top, constitute the secondary combustion chamber into two plates, the wall of the exhaust chamber is further space above the convection suppressing plate exhaust of the secondary combustion chamber swirl vanes to draw efficiently the gas chimney is formed.

Thus, when burning wood, wood was placed in the combustion chamber of the body from the inlet, it is placed on the placing portion. When ignited firewood in this state, firewood continue to burn, whereby it rises above the unburned gas mounting part occurs, the air holes of the horizontal air supply pipe is provided on the opposite side of the wood inlet because are, firewood Unlike traditional stove Yuki burning from the direction of the back, acting as the temperature beneath the secondary combustion chamber becomes maximum.

Although unburned gas generated in the combustion chamber would attempt to escape to the secondary combustion chamber through the communication plate, mostly it is burned is pushed back to the combustion chamber side because the opening area of ​​the communication board is not're fully opened while the hot gases, unburned gas that has passed through the coupling plate rises in a spiral shape by opening bent alternately upwardly and downwardly disposed symmetrically to the connecting plate.

Unburned gas that has passed through the connecting plate is not directly pass to the chimney becomes staying state by convection suppressing plate having a smaller opening area than the opening area of ​​the connecting plate, the more high temperature by the heat of the lower portion of the combustion chamber Become.

From the air supply tubes arranged symmetrically in the middle of the side surface of the connecting plate and the convection suppressing plate outside air is supplied, so sufficient air is supplied throughout the spiral secondary hot unburned gases with high efficiency is burned, exhaust unburned gas from the stack is reduced.

Exhaust gas that has passed through the convection suppressing plate, blade-like fins provided on the inner wall of the exhaust chamber is a space above the secondary combustion chamber, to strengthen the chimney effect by swirl vanes, it was suppressed by the connecting plate and the convection suppressing plate It has the effect of compensating the pulling of air from the chimney.

Hereinafter, with reference to the accompanying drawings, wood stove according to an embodiment of the present invention will be described in detail.
In FIGS. 1 to 7 show a wood stove according to the first embodiment of the present invention.

The wood stove is provided with a body 10 constituting the combustion chamber 11, 19 firewood is placed. Body 10 is a rectangular shape or cylindrical, and is hollow. Also it includes a foot 12 at the bottom. On the upper surface rear of the main body 10, a chimney 24 is provided further connected thereto a secondary combustion tube 20 which communicates with the combustion chamber 11. Further, the planar mounting unit firewood is placed is provided on the lower side of the combustion chamber 11. Furthermore, the center of the mounting portion of the combustion chamber 11 is a cylindrical horizontal air supply pipe 17 is provided. The horizontal air supply pipe 17 has a plurality of air holes 18 on both sides in the rear portion of the mounting portion.

Also, inlet 15 which firewood is turned is provided on the main body 10. Inlet 15 is provided with an openable door 13. End of the door 13 is hinged to the opening of the inlet. Middle door 13, the air amount adjusting valve 14 is provided.

Secondary combustion tube 20 which is mounted on the upper surface rear body 10 is cylindrical, the top portion is dome-shaped chimney 24 is connected to the head.

Body combustion chamber 11 and the secondary combustion cylinder communication plate 21 disk-shaped horizontally the connecting portion near the 20 are provided. Structure of communication plate 21, as shown in FIG. 4 has a plurality of notches 29 of the concentric two rows, also in the central portion comprises a communicating tube 30. Notches 29, two sections are paired with those bent obliquely downward that bent obliquely upward, vertically unburned gases from the combustion chamber 11, 19 as shown in FIG. 5 primary creating a spiral air flow is suppressed from being communicated with the combustion chamber 26. Notch in the plurality (in FIG. 4, three) is desirably are arranged symmetrically on a concentric circle. The position of the outermost row and second column of the notch portion is preferably arranged so as to face the cutout portion of the second column to the closure of the outermost rows. Side of the communication tube 30 also has a cutout portion 29 in the horizontal direction, taking spirally combustion chamber 26 unburned gas flowing from the opening provided in the center portion of the communication plate.

Also, disk-shaped convection suppressing plate 25 is provided horizontally in the middle part of the secondary combustion tube 20. Although equal convection suppressing plate 25 of the structure substantially communication plate 21, the opening area of ​​the notch is in small to be less than that of the communication plate 21. Unburned gases from the combustion chamber 11 by the above configuration is incorporated in a spiral shape in the secondary combustion chamber 26, it becomes trapped by staying state. The central portion of the convection suppressing plate 25 may be provided a plurality of simple openings to facilitate the pulling of the so part combustion is ensured chimney.

It was sandwiched by communication plate 21 and the convection suppressing plate 25 space forms a secondary combustion chamber 26, air plurality taking outside air into the outer wall of the intermediate portion of the secondary combustion chamber 26 (two in FIG. 2) providing a quantity adjusting tube 22 arranged horizontally symmetrically. The outside air inlet of the air amount adjusting pipe 22, has been respectively provided with air flow control valve 23, which is to be suitably adjusted external air inflow.

Exhaust unburned gas burned in the secondary combustion chamber 26, enters the exhaust chamber 28 connected to the chimney 24 exits the opening of the convection suppressing plate 25. Blade-like fins on the inner wall of the exhaust chamber 28, and the swirl vanes 27 are attached inclined, sucked up the exhaust spirally promote pulling chimney 24.

Focusing on the flow of air when using wood-burning stove of the invention will be described with reference to FIG. Placing and igniting the wood from inlet 15 to mounting portion. Firewood, start combustion in outside air supplied by the air control valve 14. In this case, the air flows mainly along the upper surface of the combustion chamber 11, 19, but from the air hole 18 of the horizontal air supply pipe 17, toward the previous part of the mounting portion, the outside air is supplied horizontally because, the primary combustion in the wood of the distal end portion is accelerated, the temperature just below the secondary combustion tube 20 is the highest. Without burning inlet 15 near as conventional stoves, generation of unburned gas burns at a higher temperature because burning from towards the back is reduced.

Gas containing unburned gas not be fully burned, the mounting is when you throw its hat to a secondary combustion tube 20 above the portion, the combustion since the reburning pushed back because of the closure in the communication plate 21 high efficiency is achieved. On the other hand, unburned gas that has passed through the communicating tube 30 of the central portion of the communication plate 21 and the communication plate is spirally since notches 29, which is an opening of the communication plate 21 and the communication tube is a special shape It is led to the secondary combustion chamber 26. Since the secondary combustion chamber 26 is a lid at the convection suppressing plate 25 to the upper, temporary staying state in this space is created, it is superheated by the heat of the combustion chamber 11. Such an air adjusting tube 22 in the unburned gas proper amount of outside air is fed, since it is supplied evenly with a vortex is burned unburnt gases at high efficiency, reduce exhaust unburned gases from the stack 24 provoking.

In this case, the exhaust gas passing through the cutout portion 29 is an opening of the convection suppressing plate 25 from the secondary combustion chamber 26, blade-like fins provided on the inner wall of the exhaust chamber 28, the swirl vanes 27 enhances the chimney effect to be Suiageyo chimney 24 becomes vortex, it is possible to prevent backflow.

As described above, according to the stove of the present invention, the outside air taken through the air control valve provided in the door of firewood inlet, horizontal air supply with an air hole at the tip portion of the Takigino portion it burned from the tip portion of the wood by a tube, guide the unburned gas in the secondary combustion chamber provided on its upper side, to burn the unburned gas is supplied outside air horizontally from the side surface of the secondary combustion chamber at a high efficiency can be, exhaust unburned gases from the stack, it is possible to reduce the black smoke can be hard to pollute the environment.

Further, since the secondary combustion tube is closed portion of the communication plate, now unburned gas is combusted is pushed back to the combustion chamber side, also can burn unburned gas at a high efficiency in this respect , it is possible to reduce the exhaust of unburned gases from the stack. Furthermore, since the air holes of the horizontal air supply pipe is disposed at the front end portion of the mounting portion, firewood the inner part of the stove to burn from the tip portion, i.e., the temperature just below the secondary combustion tube is enhanced combustion efficiency is enhanced.

Further, without using the conventional catalysts as a simple structure of merely providing a secondary combustion chamber to the secondary combustion cylinder, it is possible to burn the unburned gas with high efficiency by the supply of sufficient air, it just makes it possible to reduce the manufacturing cost

Is a perspective view showing a wood stove according to an embodiment of this invention. It is a side sectional view showing a main portion of the wood stove according to an embodiment of this invention. It is a front sectional view of the secondary combustion tube directly below the wood stove according to an embodiment of this invention. It is a perspective view of a communication plate of wood stove according to an embodiment of this invention. It is a sectional view taken along the circumference A-A 'of the communication plate of wood stove according to an embodiment of this invention. It is a perspective view of a convection suppressing plates of wood stove according to an embodiment of this invention. It is a cross-sectional view illustrating air flow through the wood stove according to an embodiment of this invention. Is a longitudinal sectional view is omitted chimney embodiment of a conventional wood-burning stove. S wood stove 1 body 2 combustion chamber 3 inlet 4 smokestack 5 communication port 6 secondary combustion chamber 7 platinum catalyst It is a front cross-sectional view showing another embodiment of a conventional wood-burning stove. 10 body 11 the combustion chamber 12 feet 13 mounting portion 14 covering part 14a tubular body 15 height outlet 16 ash receiving unit 17 chimney 20 first inlet 21 door 22 window 30 second input port 31 the lid 40 inclined air supply pipe 41 outlet 42 inlet 43 extending portion 44 flows amount adjusting mechanism 50 horizontal air supply pipe 51 outlet 52 inlet 54 inflow amount adjusting mechanism

DESCRIPTION OF SYMBOLS

10 body 11 the combustion chamber 12 feet 13 door 14 air control valve 15 inlet 16 support 17 horizontal air supply pipe 18 the air hole 19 the combustion chamber 20 the secondary combustion tube 21 communicating plate 22 the air control pipe 23 air control valve 24 chimney 25 convection suppressing plate 26 secondary combustion chamber 27 swirl vanes 28 exhaust chamber 29 notch 30 communicating tube

Claims (2)

1. A body constituting the combustion chamber of wood is placed, the inlet of firewood provided on the main body is turned on, a secondary combustion tube communicating with a combustion chamber provided in the main body, further to the secondary combustion cylinder in wood stove with a chimney communicating with the horizontal air planar mounting part firewood body combustion chamber is placed provided, placement unit for taking in air flowing from the air amount adjusting valve of firewood inlet It includes a supply pipe, wood stove horizontal air supply pipe having a plurality of air holes on both sides of the opposite side of the wood inlet.
2. Furthermore, the secondary combustion tube is the firewood inlet of the mounting portion provided on the upper side of the opposite side of the combustion chamber, a plurality of air volume secondary combustion tube is to be supplied from the side to adjust the fresh air amount of air having an adjusting tube, connecting plate in the secondary combustion cylinder of the lower than the mounting position of the air control pipe is provided with a convection suppression plate on the upper portion of the secondary combustion cylinder than the mounting position of the air control pipe, two configure the secondary combustion chamber between the plates, and further the upper wall of the exhaust chamber which is a space convection suppressing plate, characterized in that the swirl blade to draw exhaust gas in the secondary combustion chamber to the chimney is constituted claimed wood stove as claimed in claim 1.

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