JP2013044513A - Woody pellet combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a visual confirmation section from being clouded, and to seal a combustion chamber to an installation space.SOLUTION: In a pellet stove 10, the combustion chamber 28 can be visually confirmed from the outside of a housing 18 through the heat-resistant glass 36 of a door 32. Furthermore, as air is distributed from a delivery box 48 to a lower end of the heat-resistant glass 36 and rises in the combustion chamber 28, the clouding of the heat-resistant glass 36 caused by the attachment of soot and ash to the heat-resistant glass 36 can be prevented. As only the air at an outdoor side 16 is distributed to a lower end of the heat-resistant glass 36 through the inside of an intake pipe 42, an introduction pipe 44, a delivery pipe 46 and the delivery box 48, the combustion chamber 28 is sealed to an indoor side 12. Thus, the air (in particular, smoke) of the combustion chamber 28 is effectively prevented from leaking to an indoor side 12.

Description

  The present invention relates to a wood pellet combustion apparatus for burning wood pellets.

  In the pellet stove (wood pellet combustion apparatus) described in Patent Document 1 below, a combustion chamber is provided in a casing installed in the room, and the wood pellet is burned in the combustion chamber. Further, the housing is provided with heat resistant glass, and the combustion chamber is made visible by the heat resistant glass. Furthermore, it is suppressed that the heat resistant glass is clouded by air flowing on the inner surface of the heat resistant glass.

  However, in this pellet stove, air that flows on the inner surface of the heat-resistant glass is sucked from the room. For this reason, the combustion chamber is not sealed with respect to the room.

JP 2009-275985 A

  An object of the present invention is to obtain a wood pellet combustion apparatus which can suppress the fogging of the visual recognition part and can seal the combustion chamber from the installation space in consideration of the above facts.

  The wood pellet combustion apparatus according to claim 1 is installed in an installation space and includes a case constituting an outer periphery, a combustion chamber provided in the case, in which the wood pellet is burned, and the combustion chamber from outside the case. A visual recognition unit that enables visual recognition, and a sending unit that communicates the outside of the installation space to the combustion chamber side of the visual recognition unit, and sends only air outside the installation space to the combustion chamber side of the visual recognition unit. ing.

  A wood pellet combustion apparatus according to a second aspect is the wood pellet combustion apparatus according to the first aspect, wherein the delivery means delivers air from a direction intersecting the visual recognition portion to a lower portion of the visual recognition portion.

  In the wood pellet combustion apparatus according to the first aspect, the case constituting the outer periphery is installed in the installation space. Further, a combustion chamber is provided in the case, and the wood pellets are burned in the combustion chamber.

  Moreover, the visual recognition part makes the combustion chamber visible from the outside of the case, and the sending means can send air to the combustion chamber side of the visual recognition part, thereby suppressing the visual recognition part from being fogged.

  Here, the sending means communicates the outside of the installation space to the combustion chamber side of the visual recognition part, and sends only the air outside the installation space to the combustion chamber side of the visual recognition part. For this reason, a combustion chamber can be sealed with respect to installation space, and it can suppress effectively that the air of a combustion chamber leaks into installation space.

  In the wood pellet combustion apparatus according to the second aspect, the air is sent from the direction in which the delivery means intersects the visual recognition part to the lower part of the visual recognition part. For this reason, the air sent out to the lower part of a visual recognition part can rise along a visual recognition part favorably with the air raised by combustion of a wood pellet in a combustion chamber. Thereby, it can suppress effectively that a visual recognition part becomes cloudy in the wide range of a visual recognition part.

It is sectional drawing seen from the right side which shows the pellet stove concerning embodiment of this invention. It is sectional drawing seen from the front which shows the pellet stove concerning embodiment of this invention. It is the perspective view seen from the right diagonal front which shows the pellet stove which concerns on embodiment of this invention. It is the perspective view seen from the front diagonal upper part which shows the principal part of the pellet stove which concerns on embodiment of this invention. It is the perspective view seen from the diagonal right front which shows the principal part of the pellet stove concerning the embodiment of the present invention.

  FIG. 1 shows a cross-sectional view of a pellet stove 10 as a wood pellet combustion apparatus according to an embodiment of the present invention viewed from the right side, and FIG. 2 shows a cross-section of the pellet stove 10 viewed from the front side. It is shown in the figure. Furthermore, the pellet stove 10 is shown by the perspective view seen from the diagonally right front in FIG. In the drawing, the front of the pellet stove 10 is indicated by an arrow FR, the right side of the pellet stove 10 is indicated by an arrow RH, and the upper side of the pellet stove 10 is indicated by an arrow UP.

  As shown in FIGS. 1-3, the pellet stove 10 which concerns on this embodiment is installed in the indoor 12 (room) as an installation space of a building. An outer wall 14 as a partition wall of the building is disposed on the rear side of the pellet stove 10, and the outer wall 14 partitions between the indoor 12 and the outdoor 16 (outdoor).

  The pellet stove 10 includes a rectangular parallelepiped box-shaped casing 18 as a case, and the casing 18 constitutes the outer periphery of the pellet stove 10. A flat partition plate 20 is fixed in the housing 18, and the partition plate 20 partitions the housing 18 into a front side and a rear side. The rear part of the housing 18 from the partition plate 20 is a machine room 22, and the machine room 22 is not sealed (opened) with respect to the indoor 12. A supply lid 24 is provided on the rear side of the upper wall of the housing 18 so as to be openable and closable.

  The machine room 22 is provided with a hopper (not shown) as a fuel tank. When the supply lid 24 is opened, the inside of the hopper is opened upward, and the upper side of the casing 18 (the upper side of the machine room 22). ) To store wood pellets (not shown) as fuel. The wood pellet is a cylindrical processing fuel made by pulverizing and compressing thinned wood, and the wood pellet has a diameter of about 4 mm to 7 mm and a length of about 5 mm to 20 mm, for example.

  The machine chamber 22 is provided with a screw (not shown) that constitutes a conveying means. When the screw is operated and an internal screw body (not shown) is rotated, the wood pellets in the hopper are screwed. It is scraped out by the main body and raised in the screw. The machine room 22 is provided with a circular supply pipe 26 (see FIGS. 4 and 5) that constitutes a conveying means, and the supply pipe 26 is inclined downward as it goes forward. The upper end (rear end) of the supply pipe 26 communicates with the upper end of the screw, and the wood pellets raised in the screw are dropped in the supply pipe 26.

  The inside of the hopper, the screw, and the supply pipe 26 are closed by the supply lid 24 and are sealed with respect to the indoor 12. When the supply lid 24 is opened, the hopper, the screw, and the supply pipe 26 are closed. Is opened to the indoor 12.

  A combustion chamber 28 is formed on the front side of the partition plate 20 in the housing 18. The combustion chamber 28 is formed in a rectangular parallelepiped box-shaped can 30 as a heat exchanging portion, and the can 30 has a front wall constituted by a front wall of the housing 18 and a rear wall formed by a partition plate. 20. The inside of the lower end (front end) of the supply pipe 26 is opened to the combustion chamber 28 (see FIGS. 4 and 5), and the wood pellets dropped in the supply pipe 26 are supplied to the combustion chamber 28.

  The front wall of the can 30 is an opening / closing door 32 (see FIGS. 4 and 5) as an opening / closing portion, and the combustion chamber 28 is closed by the opening / closing door 32. The open / close door 32 is rotatable about one end (the left end in the present embodiment), and a gripping portion 34 is fixed to the outside (indoor 12 side) of the other end (the right end in the present embodiment) of the open / close door 32. The open / close door 32 is rotated around one end in a state where the grip portion 34 is gripped, and can be opened and closed. When the open / close door 32 is opened, the combustion chamber 28 is opened to the indoor 12 so that the combustion chamber 28 (such as the upper surface of the following rooster 38A) can be cleaned. The open / close door 32 is provided with a rectangular plate-shaped heat-resistant glass 36 as a visual recognition part. The heat-resistant glass 36 is transparent or translucent, and can transmit light between the indoor 12 and the combustion chamber 28. Has been.

  A rectangular parallelepiped box-shaped combustion table 38 that constitutes a combustion unit is provided at a lower portion of the combustion chamber 28, and a partition plate 20 (rear wall of the can 30) is formed on the rear wall of the combustion table 38. Yes. The combustion table 38 is not provided with a lower wall, and thereby the inside of the combustion table 38 is opened downward.

  The upper wall of the combustion bed 38 is a flat plate-shaped rooster 38A (combustion shelf), and the wood pellets supplied from the supply pipe 26 to the combustion chamber 28 are dropped (supplied) onto the rooster 38A. A plurality of air injection holes (not shown) are formed through the rooster 38A, and the inside of the combustion table 38 and the upper side of the combustion table 38 (the upper side of the rooster 38A) are communicated with each other through the plurality of air injection holes. Yes. In addition, the air nozzle hole is made into the magnitude | size which a wooden pellet does not pass (fall).

  A rod-shaped ignition heater 40 (see FIG. 4) as ignition means constituting the combustion section is fixed below the rooster 38A. The ignition heater 40 is, for example, a so-called “ceramic heater”. The ignition heater 40 is inclined in the upward direction as it goes rearward, and is inclined by a predetermined angle with respect to the plate surface of the rooster 38A. The ignition heater 40 penetrates the rooster 38A, and the tip (equal to the upper end and the rear end) protrudes a predetermined amount from the upper surface of the rooster 38A. The tip of the ignition heater 40 is made of wood pellets dropped on the rooster 38A. Covered. For this reason, the ignition heater 40 is activated (energized), and the wood pellets on the rooster 38A are ignited (ignited) by the heat generated by the ignition heater 40, whereby the wood pellets are burned on the rooster 38A. The combustion chamber 28 (the combustion state of the wood pellets on the rooster 38A and the rooster 38A (for example, flame)) is visible from outside the housing 18 through the heat-resistant glass 36 of the door 32.

  A cylindrical intake pipe 42 constituting supply means is provided on the rear side of the housing 18, and the intake pipe 42 penetrates the outer wall 14 of the building and the inside of the rear end is opened to the outdoor 16. Yes. The front end of the intake pipe 42 communicates with the rear end of a bent substantially cylindrical introduction pipe 44 that constitutes the supply means. The introduction pipe 44 penetrates the rear wall of the housing 18 and the machine chamber 22. The interior of the front end communicates with the combustion bed 38 in the combustion chamber 28 via the partition plate 20 (the rear wall of the can 30).

  As shown in detail in FIGS. 4 and 5, the combustion chamber 28 is provided with cylindrical delivery pipes 46 constituting delivery means on the upper right side and the left side of the combustion table 38. The rear end is communicated with the front end of the introduction pipe 44 through the partition plate 20 (the rear wall of the can 30). A long rectangular parallelepiped box-shaped delivery box 48 constituting delivery means is connected between the front ends of the pair of delivery pipes 46, and the inside of the front end of each delivery pipe 46 communicates with the delivery box 48. . The delivery box 48 is disposed in the vicinity of the rear side of the lower end of the heat-resistant glass 36 of the door 32 on the upper side and the front side of the combustion bed 38, and the delivery box 48 extends in the left-right direction along the lower end of the heat-resistant glass 36. Has been stretched. A long rectangular delivery hole 50 is formed through the front wall of the delivery box 48, and the delivery hole 50 is extended in the longitudinal direction (left-right direction) of the delivery box 48, so that the inner surface of the heat-resistant glass 36. (Combustion chamber 28 side face) It faces the entire left and right direction at the lower end.

  The machine chamber 22 is provided with a bent cylindrical lead-out pipe 52 that constitutes a discharge means, and the inside of the front end (inside the top end) of the lead-out pipe 52 is interposed via the partition plate 20 (the rear wall of the can 30). The combustion chamber 28 communicates with the upper end. The rear end (lower end) of the lead-out pipe 52 communicates with a fan 54 serving as an air supply unit, and the fan 54 communicates with a front end of a cylindrical exhaust pipe 56 that constitutes a discharge unit. The exhaust pipe 56 penetrates through the intake pipe 42, and the exhaust pipe 56 is closed between the front end of the intake pipe 42 and the rear end is open to the outdoors 16.

  As described above, the combustion chamber 28 passes through the introduction pipe 44 and the intake pipe 42, the delivery box 48, the pair of delivery pipes 46, the introduction pipe 44 and the intake pipe 42, the outlet pipe 52, the fan 54 and the exhaust pipe 56. The combustion chamber 28 is sealed with respect to the indoor 12 while being open to the outdoor 16.

  A rectangular parallelepiped box-shaped ash tray 58 (see FIGS. 4 and 5) is disposed at the lower end of the combustion chamber 28 below the combustion bed 38. The upper surface of the ash tray 58 is opened as a whole. ing. For this reason, the burning waste (ash) of the wood pellet burned on the rooster 38 </ b> A and dropped from the periphery of the rooster 38 </ b> A or the air nozzle hole of the rooster 38 </ b> A is accommodated in the ash tray 58. When the open / close door 32 is opened, the ash receiving tray 58 is slidable in the front-rear direction. With the open / close door 32 open, the ash receiving tray 58 is slid forward and removed from the combustion chamber 28. The burnt residue of the wood pellets accumulated in the ash tray 58 can be discarded.

  The front side part of the partition plate 20 in the housing 18 is a heat exchange chamber 60 (blower chamber) in the entire outside of the can body 30, and the heat exchange chamber 60 is provided on both the upper and lower sides and the left and right sides of the can body 30. Is arranged. A heating fan 62 (cross flow fan) as a blower is provided at the upper end of the machine room 22, and the heating fan 62 communicates with the upper end of the heat exchange chamber 60 through the partition plate 20. An air outlet 64 (air outlet) is formed through the lower portion of the front wall of the housing 18, and the air outlet 64 communicates with the lower part of the heat exchange chamber 60. The heat exchange chamber 60 is hermetically sealed with respect to the indoor 12 except for a portion communicating with the heating fan 62 and a portion where the blowout holes 64 are formed.

  The screw, the ignition heater 40, the fan 54, and the heating fan 62 are electrically connected to a control device (not shown) via wiring, and the control device includes a CPU and a driver. An operation switch (not shown) is electrically connected to the control device via wiring, and the operation switch can be turned on and off.

  Next, the operation of this embodiment will be described.

  In the pellet stove 10 having the above configuration, when the operation switch is turned on and activated, the fan 54 is activated by the control of the control device, so that the air in the outlet pipe 52 is exhausted by the fan 54. It is discharged into the tube 56.

  For this reason, the air in the outdoor 16 is sucked into the intake pipe 42 from the rear end of the intake pipe 42, and the combustion bed of the combustion chamber 28 from the front end of the introduction pipe 44 through the intake pipe 42 and the introduction pipe 44. 38. The air sent into the combustion bed 38 is sent to the upper side of the rooster 38 </ b> A from the plurality of air holes of the rooster 38 </ b> A of the combustion bed 38 and is raised in the combustion chamber 28.

  Also, as described above, the outdoor 16 air sent into the front end of the introduction pipe 44 passes through the pair of delivery pipes 46 and the delivery box 48 from the delivery hole 50 of the delivery box 48 to the lower end of the heat-resistant glass 36. It is sent to the entire left and right direction. The air sent to the entire left and right direction at the lower end of the heat-resistant glass 36 is raised in the combustion chamber 28 along with the air sent to the upper side of the rooster 38A and raised. Note that the air passing through the pair of delivery pipes 46 and the delivery box 48 is heated by combustion of the wood pellets on a rooster 38A described later.

  Further, as described above, the air that has been sent to the upper side of the rooster 38 </ b> A and raised through the combustion chamber 28, and the air that has been sent from the delivery hole 50 of the delivery box 48 and raised through the combustion chamber 28, The air is sucked into the outlet pipe 52 from the front end, and is discharged to the outdoor 16 from the rear end of the exhaust pipe 56 through the outlet pipe 52, the fan 54, and the exhaust pipe 56.

  When the pellet stove 10 is operated, the screw is operated under the control of the control device, so that the wood pellets in the hopper fall on the rooster 38A in the combustion chamber 28 through the screw and the supply pipe 26. Then, the tip of the ignition heater 40 is covered. At this time, the operation of the ignition heater 40 is started under the control of the control device, and the wood pellets on the rooster 38A are ignited by the heat generated by the ignition heater 40, whereby the wood pellets are burned on the rooster 38A. The operation of the ignition heater 40 is terminated when a predetermined time has elapsed from the start (after a while after the wood pellet is ignited). Further, the combustion of the wood pellets on the rooster 38A is assisted by the air (primary air for combustion) sent to the upper side of the rooster 38A from the plurality of air nozzle holes of the rooster 38A as described above.

  When the wood pellets are burned on the rooster 38A and the air in the combustion chamber 28 is heated and the can 30 is heated, the heating fan 62 is operated under the control of the control device. For this reason, the air in the indoor 12 is sent to the upper end of the heat exchange chamber 60 through the inside of the machine room 22 and the heating fan 62, so that the heat exchange chamber 60 is lowered and the air is discharged from the blowout hole 64 of the housing 18. It is sent out indoors 12. Thereby, the air (warm air) heated by the heat of the can 30 is obtained by performing heat exchange between the air passing through the periphery of the can 30 in the heat exchange chamber 60 and the can 30. It is sent out from the blowout hole 64 to the indoor 12.

  When the wood pellets are burned on the rooster 38A, the screw is intermittently operated under the control of the control device, and the wood pellets in the hopper are sequentially dropped onto the rooster 38A. Thereby, the combustion state of the wood pellet on the rooster 38A is maintained.

  Burn residue (ash) generated by burning wood pellets on the rooster 38A is pushed by the wood pellets newly refilled on the rooster 38A by the operation of the screw, and the surroundings of the rooster 38A and the air nozzle holes of the rooster 38A. Is dropped into the ash tray 58.

  Incidentally, the open / close door 32 is provided with a heat-resistant glass 36, and the combustion chamber 28 (the combustion state of wood pellets (for example, flame) on the rooster 38 </ b> A and the rooster 38 </ b> A) is outside the housing 18 through the heat-resistant glass 36. Visible from. For this reason, while the pellet stove 10 is in operation, the flame caused by the burning of the wood pellets on the rooster 38A can be viewed from the outside of the casing 18, and the state of the combustion chamber 28 (especially the rooster 38A and its surroundings) when the combustion chamber 28 is cleaned. Can be confirmed from outside the housing 18.

  Here, as described above, when the pellet stove 10 is operated, the air in the outdoor 16 is sent from the delivery hole 50 of the delivery box 48 to the entire left and right direction of the lower end of the heat-resistant glass 36, so that the upper side of the rooster 38 </ b> A. And the combustion chamber 28 is lifted by the air that is raised by the operation of the fan 54 and the combustion of the wood pellets. For this reason, a so-called air curtain can be formed on the inner surface of the heat-resistant glass 36, and soot and ash resulting from the burning of the wood pellets on the rooster 38 </ b> A adhere to the inner surface of the heat-resistant glass 36. Can suppress fogging. Thereby, even after the pellet stove 10 is operated for a long time, the flame caused by the burning of the wood pellets on the rooster 38A can be observed from the outside of the casing 18 during the operation of the pellet stove 10 and is burned when the combustion chamber 28 is cleaned. The status of the chamber 28 can be confirmed from outside the housing 18.

  Moreover, the air sent from the delivery hole 50 of the delivery box 48 is delivered from the direction facing the inner surface of the heat resistant glass 36 (particularly the vertical direction) to the entire left and right direction of the lower end of the heat resistant glass 36. For this reason, the air sent to the entire left and right direction at the lower end of the heat-resistant glass 36 is sent to the upper side of the rooster 38A, and the air is raised by the operation of the fan 54 and the combustion of the wood pellets. Can be raised to at least the upper end of the heat-resistant glass 36 along the entire left-right direction. Thereby, an air curtain can be formed effectively on the entire inner surface of the heat-resistant glass 36, and the fogging of the inner surface of the heat-resistant glass 36 can be effectively suppressed on the entire inner surface of the heat-resistant glass 36.

  Furthermore, not only the air sent to the upper side of the rooster 38 </ b> A from the plurality of air nozzle holes of the rooster 38 </ b> A of the combustion bed 38, but also the air sent to the lower end of the heat-resistant glass 36 of the open / close door 32 is only the outdoor 16 air. As a result, the combustion chamber 28 is sealed with respect to the indoor 12. For this reason, even if the building is a so-called highly airtight house and the airtightness of the indoor 12 is high, for example, air (especially smoke) in the combustion chamber 28 can be effectively suppressed from leaking into the indoor 12 during a power failure. Thus, the safety of the pellet stove 10 can be effectively increased.

  In addition, a blowout hole 64 through which air (warm air) heated by the heat of the can 30 is sent out is disposed in the lower portion of the housing 18. For this reason, while being able to warm a person's step efficiently, the warm air sent out from the blowing hole 64 can be easily supplied, for example to a bag. Furthermore, since the human ear is usually located at a position separated from the blowout hole 64, it is possible to suppress the wind noise due to the warm air sent from the blowout hole 64 from being heard by the person, and the quietness of the pellet stove 10 can be reduced. Can be improved. And since a person's face exists in the position higher than the blowing hole 64 normally, it can suppress that the warm air sent out from the blowing hole 64 hits a person's face directly, and can suppress giving disgust to a person. .

  In this embodiment, the delivery hole 50 is formed through the front wall of the delivery box 48 and air is sent from the delivery hole 50 toward the inner surface of the heat-resistant glass 36. 50 may be formed so as to penetrate air from the delivery hole 50 along the inner surface of the heat-resistant glass 36.

  Further, in this embodiment, air that has not been sent from the outdoor 16 to the combustion chamber 28 is sent to the inner surface of the heat-resistant glass 36 from the delivery hole 50 of the delivery box 48, but air that has been sent from the outdoor 16 to the combustion chamber 28. May be delivered from the delivery hole 50 of the delivery box 48 to the inner surface of the heat-resistant glass 36.

  Moreover, although this embodiment demonstrated the case where this invention was applied with respect to a pellet stove, this invention is applicable not only to this but the boiler etc. which use a wood pellet as a fuel.

10 Pellet stove (wood pellet combustion equipment)
12 Indoor (installation space)
18 Case
28 Combustion chamber 36 Heat-resistant glass (viewing part)
46 Delivery pipe (delivery means)
48 Sending box (sending means)

Claims (2)

A case that is installed in the installation space and constitutes the outer periphery;
A combustion chamber provided in the case for burning wood pellets;
A visual recognition section for making the combustion chamber visible from outside the case;
Sending means for communicating outside the installation space to the combustion chamber side of the visual recognition unit, and sending only air outside the installation space to the combustion chamber side of the visual recognition unit;
Wood pellet burning device equipped with.   The wood pellet combustion apparatus according to claim 1, wherein the delivery means delivers air from a direction intersecting the viewing portion to a lower portion of the viewing portion.

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