JP7444446B2 - wood pellet combustion equipment - Google Patents

Description

The present invention relates to a wood pellet combustion device in which wood pellets are burned in a combustion chamber.

In the pellet stove described in Patent Document 1 below, wood pellets are burned in a combustion chamber.

Here, in such a pellet stove, since the wood pellets are solid, the ignition of the wood pellets is unstable compared to gaseous fuels and liquid fuels. For this reason, when wood pellets are ignited, a large amount of combustible gas (white smoke) is generated due to the properties of the wood pellets, and the combustible gas ignites at once, causing a sudden rise in the internal pressure of the combustion chamber. there is a possibility.

JP2013-44513A

The present invention takes the above-mentioned facts into consideration and aims to provide a wood pellet combustion device that can suppress a sudden increase in the internal pressure of a combustion chamber.

The wood pellet combustion device according to claim 1 includes: a combustion chamber in which wood pellets are burned and air is heated; and an opening/closing door that forms a peripheral wall of the combustion chamber and opens to open the combustion chamber. It is provided only on the opening/closing door side or only on the combustion chamber side other than the opening/closing door, and applies a biasing force to the opening/closing door so that the opening/closing door closes the combustion chamber and increases the internal pressure of the combustion chamber. and a biasing means for releasing the closure of the combustion chamber by the opening/closing door against a biasing force.

A wood pellet combustion apparatus according to a second aspect of the present invention is the wood pellet combustion apparatus according to the first aspect, in which the opening/closing door is rotated to open and close.

The wood pellet combustion device according to claim 3 is the wood pellet combustion device according to claim 1 or 2, wherein the wood pellet combustion device is provided on the opening/closing door, movement is regulated, and opening of the opening/closing door is regulated. , a regulating portion is provided with the biasing means to apply a biasing force to the opening/closing door.

In the wood pellet combustion device according to the first aspect, the wood pellets are burned in the combustion chamber to heat the air. Further, the opening/closing door constitutes a peripheral wall of the combustion chamber, and when the opening/closing door is opened, the combustion chamber is opened.

Here, the biasing means applies a biasing force to the opening/closing door, and when the opening/closing door closes the combustion chamber and the internal pressure of the combustion chamber increases, the opening/closing door resists the biasing force of the biasing means. The closure of the combustion chamber is released. Therefore, it is possible to suppress a sudden increase in the internal pressure of the combustion chamber.

In the wood pellet combustion device according to the second aspect of the present invention, the opening/closing door is rotated to open and close. Therefore, the closure of the combustion chamber by the opening/closing door can be released by rotating the opening/closing door, and the closure of the combustion chamber by the opening/closing door can be easily released.

In the wood pellet combustion apparatus according to the third aspect, the movement of the regulating portion of the opening/closing door is regulated, and opening of the opening/closing door is regulated.

Here, a biasing means is provided in the regulating portion to apply a biasing force to the opening/closing door. Therefore, the biasing means can absorb the load on the regulating section when the movement of the regulating section is restricted.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a pellet stove according to an embodiment of the present invention, viewed diagonally from the front right. 1 is a cross-sectional view of a pellet stove according to an embodiment of the present invention, seen from the right side. FIG. 1 is a cross-sectional view of a pellet stove according to an embodiment of the present invention, seen from the front. FIG. 2 is a perspective view of the opening/closing door of the pellet stove according to the embodiment of the present invention, seen diagonally from the rear left. It is a perspective view seen diagonally from the left rear showing the main part of the opening/closing door in the pellet stove according to the embodiment of the present invention. It is a sectional view seen from above showing a combustion chamber in a pellet stove concerning an embodiment of the present invention.

FIG. 1 shows a perspective view of a pellet stove 10 as a wood pellet combustion device according to an embodiment of the present invention, as viewed diagonally from the front right. Further, FIG. 2 shows a sectional view of the pellet stove 10 as seen from the right, and FIG. 3 shows a sectional view of the pellet stove 10 as seen from the front. In addition, in the drawing, the front of the pellet stove 10 is shown by an arrow FR, the left side of the pellet stove 10 is shown by an arrow LH, and the upper part is shown by an arrow UP.

The pellet stove 10 according to this embodiment is of a closed type (FF type) and is installed indoors (installation space) of a building.

As shown in FIGS. 1 to 3, the pellet stove 10 is provided with a casing 12 in the shape of a substantially rectangular parallelepiped box, and the casing 12 constitutes the outer surface of the pellet stove 10. A vent 14 is formed through the lower part of the rear wall of the casing 12, and the vent 14 opens the inside of the casing 12 to the room on the rear side of the casing 12.

A funnel-shaped hopper 16 serving as a storage section is provided at the upper rear portion of the housing 12, and the inside of the hopper 16 is open upward. A substantially plate-shaped hopper lid 16A is provided above the hopper 16, and the hopper lid 16A closes the inside of the hopper 16 from above. The hopper lid 16A is rotatable, and when the hopper lid 16A is rotated upward, the interior of the hopper 16 is opened upward. For example, cylindrical wood pellets 18, which are processed fuel, are stored in the hopper 16, and the wood pellets 18 are manufactured by crushing and compressing thinned wood or the like.

A supply screw 20 serving as a supply means is fixed to the lower side of the hopper 16. The supply screw 20 is provided with a cylindrical conveyance tube 20A, and the axial direction of the conveyance tube 20A is inclined upward as it goes forward. The lower end (rear end) of the transport cylinder 20A is connected to the lower end of the hopper 16, and the wood pellets 18 in the hopper 16 are flowed down to the lower end of the transport cylinder 20A. A screw 20B is provided coaxially within the conveyance cylinder 20A, and a supply motor 20C serving as a supply drive means is connected to the lower end (rear end) of the screw 20B. The supply motor 20C is electrically connected to a control device (not shown), and when the supply motor 20C is driven under the control of the control device, the screw 20B is rotated, and the wood pellets 18 in the transport cylinder 20A are rotated. is transported to the upper side (front side). A supply cylinder 20D is connected to the upper end (front end) of the transport cylinder 20A, and the axial direction of the supply cylinder 20D is inclined downward as it goes forward. The upper end (rear end) of the supply cylinder 20D is communicated with the upper end of the transport cylinder 20A, and the wood pellets 18 conveyed to the upper end of the transport cylinder 20A flow down the supply cylinder 20D to the front side. be done.

A rectangular parallelepiped combustion chamber 24 is provided at the front of the housing 12, and a supply tube 20D of the supply screw 20 passes through the rear wall of the combustion chamber 24. Elongated rectangular heating holes 26 are formed through the upper ends of the left and right walls of the combustion chamber 24, and the heating holes 26 extend in the front-rear direction. Near the front end of the casing 12, a rectangular annular seal wall 12A (see FIG. 2) serving as a seal portion is provided around the entire front side of the combustion chamber 24, and the seal wall 12A has a flat plate shape. They are arranged vertically in the front-back direction.

A substantially rectangular plate-shaped opening/closing door 22 (see FIGS. 4 and 5) is provided at the front end of the housing 12. The opening/closing door 22 is closed to open the front wall of the housing 12 and the combustion chamber 24. It constitutes the front wall (peripheral wall) of. A rectangular frame-shaped gasket 22A serving as a sealing member is fixed to the rear circumference of the opening/closing door 22, and the gasket 22A is made of heat-resistant rubber and protrudes toward the rear side. The gasket 22A is elastically contracted around the entire circumference between the seal wall 12A of the housing 12, and as a result, the gasket 22A seals between the seal wall 12A and the opening/closing door 22, and the opening/closing door 22 is closed. The front side of the combustion chamber 24 is closed. The opening/closing door 22 is provided with a rectangular plate-shaped heat-resistant glass 22B as a viewing part on the inside of the gasket 22A.The heat-resistant glass 22B is made transparent so that the combustion chamber 24 can be seen from the front side of the housing 12. making it possible.

A cylindrical rotating shaft 22C is provided at the left end of the opening/closing door 22, and the opening/closing door 22 is supported by the housing 12 at the rotating shaft 22C, and rotates about the rotating shaft 22C. movement) is enabled.

A biasing plate 80 as a biased member is provided at the right end portion of the rear surface of the opening/closing door 22 at an intermediate portion in the vertical direction. A U-shaped plate-shaped front wall 80A is provided on the front side of the biasing plate 80, and the front wall 80A is fixed to the opening/closing door 22 and has an upper end and a lower end extending to the left side. . A rectangular plate-shaped left wall 80B is provided at the upper and lower left sides of the biasing plate 80, and the upper left wall 80B extends rearward and upward from the upper end of the front wall 80A. The lower left wall 80B extends rearward and downward from the lower end of the front wall 80A. A rectangular plate-shaped rear wall 80C is provided at the upper and lower rear ends of the biasing plate 80, and the upper and lower rear walls 80C are located above the upper and lower left walls 80B, respectively. It extends from the section to the right.

A regulation plate 82 serving as a biasing member (regulating portion) is provided on the rear surface of the opening/closing door 22 around the biasing plate 80 . A T-shaped plate-shaped right wall 82A is provided on the right side of the regulation plate 82, and the right wall 82A is arranged on the rear side, upper side, and lower side of the front wall 80A of the biasing plate 80, and is arranged on the upper and lower sides. The direction intermediate portion is protruded to the rear side. A rectangular plate-shaped front wall 82B is provided at the upper and lower ends of the front side of the regulating plate 82, and the upper and lower front walls 82B extend from the upper and lower ends of the right wall 82A to the left side, respectively. It has been extended. The upper and lower front walls 82B are arranged above and below the front wall 80A of the biasing plate 80, respectively, and the upper and lower front walls 82B are arranged above and below the biasing plate 80, respectively. It faces the rear wall 80C in the front-rear direction.

The upper and lower rear walls 80C of the biasing plate 80 and the upper and lower front walls 82B of the regulating plate 82 are connected by a substantially cylindrical connecting pin 84 as a connecting member, respectively. restricts movement of the biasing plate 80 in the vertical direction with respect to the regulation plate 82, and also prevents movement of the biasing plate 80 in the longitudinal direction within a predetermined range and in the horizontal direction with respect to the regulation plate 82 within a predetermined range. Allowed.

A spiral compression coil ring 86 as a biasing means is stretched between the upper and lower rear walls 80C of the biasing plate 80 and the upper and lower front walls 82B of the regulating plate 82, respectively. A connecting pin 84 coaxially passes through the compression coil ring 86 . The rear end of the compression coil ring 86 is fixed to the biasing plate 80 (rear wall 80C), and the front end of the compression coil ring 86 is fixed to the regulation plate 82 (front wall 82B). limits movement of the biasing plate 80 in the left-right direction with respect to the regulating plate 82. The compression coil ring 86 applies a biasing force to the rear side of the regulating plate 82 on the biasing plate 80, and the compression coil ring 86 restricts the movement of the biasing plate 80 in the front-back direction with respect to the regulating plate 82. ing.

A cylindrical regulation pin 82C serving as a regulation portion is fixed to the vertically intermediate portion of the right wall 82A of the regulation plate 82, and the regulation pin 82C protrudes to the left. A regulating mechanism (not shown) is provided at the right end of the housing 12, and the regulating mechanism is rotatably provided with, for example, an L-shaped plate-shaped regulating hook as a regulating member. The regulating mechanism is operated so that the regulating hook is rotated and hooked onto the regulating pin 82C, thereby regulating the movement of the regulating plate 82 (regulating pin 82C) to the front side of the opening/closing door 22. Rotation to is regulated (locked). When the restriction mechanism is released, the rotation of the restriction hook releases the restriction hook from the restriction pin 82C, and the restriction on the forward movement of the restriction plate 82 (restriction pin 82C) is released. As a result, the restriction on the forward rotation of the opening/closing door 22 is released, and the opening/closing door 22 can be opened.

As shown in FIGS. 2 and 3, a rectangular parallelepiped box-shaped combustion box 28 is provided at the rear lower part of the combustion chamber 24, and the rear wall of the combustion box 28 is the rear wall of the combustion chamber 24. ing. A rectangular parallelepiped box-shaped combustion furnace 30 is provided at the front and upper part of the combustion box 28, and the front wall, left wall, and right wall of the combustion furnace 30 are the front wall, left wall, and left wall of the combustion box 28, respectively. and the right wall, and the inside of the combustion furnace 30 is open to the upper side of the combustion box 28. A lower wall and a rear wall of the combustion furnace 30 are formed into a rooster 30A, and a large number of air holes 32 are formed through the roostor 30A. The front end (lower end) of the supply cylinder 20D of the supply screw 20 is arranged at the upper side of the combustion furnace 30, and the wood pellets 18 that have been flown forward inside the supply cylinder 20D are flowed down into the combustion furnace 30 and supplied. be done. Further, a portion of the combustion box 28 outside the combustion furnace 30 is made into an air supply chamber 34.

An ignition tube 36 is connected to the rear wall of the combustion furnace 30, and the interior of the ignition tube 36 is communicated with the inside of the combustion furnace 30, and the ignition tube 36 is penetrated through the rear wall of the combustion chamber 24 so as to be connected to the rear from the combustion chamber 24. It has been extended to An ignition heater 38 is provided within the ignition tube 36, and the ignition heater 38 is electrically connected to the control device. The ignition heater 38 is enabled to generate heat under the control of the control device, and when the ignition heater 38 generates heat and heats the wood pellets 18 in the combustion furnace 30, the ignition heater 38 ignites the wood pellets 18. is made possible.

A supply cylinder 40 is connected to the rear wall of the combustion box 28 (the rear wall of the combustion chamber 24 ) below the ignition tube 36 , and the interior of the supply cylinder 40 is connected to the air supply chamber 34 inside the combustion box 28 . It communicates with the combustion chamber 24 and extends rearward from the combustion chamber 24.

An air supply box 42 is connected to the rear side of the ignition tube 36 and the rear side of the supply cylinder 40, and the inside of the air supply box 42 is communicated with the inside of the ignition tube 36 and the inside of the supply cylinder 40. An air supply pipe 42A is connected to the rear wall of the air supply box 42, and the interior of the air supply pipe 42A communicates with the inside of the air supply box 42, and extends from the air supply box 42 to the rear side. . The air supply pipe 42A is connected to an air supply pipe 42B via an air supply relay box 43, and the air supply pipe 42B extends to the outside of the building (outdoors) through the lower part of the rear wall of the housing 12. There is.

A rectangular parallelepiped-shaped left heating chamber 44 and right heating chamber 46 are provided on the left and right sides of the combustion chamber 24, respectively, and the front walls of the left heating chamber 44 and the right heating chamber 46 are connected to the seal wall 12A of the housing 12. is being used. The right wall of the left heating chamber 44 is the left wall of the combustion chamber 24, and the left wall of the right heating chamber 46 is the right wall of the combustion chamber 24. , are communicated with the combustion chamber 24 via the heating holes 26 of the combustion chamber 24.

A rectangular parallelepiped box-shaped ash receiving tray 48 is fitted into the lower end of the combustion chamber 24 directly below the combustion box 28 , and the inside of the ash receiving tray 48 is opened upward and communicates with the combustion chamber 24 . has been done. The ash receiving tray 48 is slidable in the front-rear direction, and by sliding the ash receiving tray 48 forward with the opening/closing door 22 open, the ash receiving tray 48 is moved outside the combustion chamber 24 (outside the casing). (outside the body 12).

An exhaust box 52 is connected to the lower end of the rear wall of the combustion chamber 24, the left heating chamber 44, and the right heating chamber 46 on the lower side of the supply cylinder 40. It communicates with the right heating chamber 46. Inside the exhaust box 52, an exhaust fan 54 is provided as a circulation section constituting a circulation means, and an exhaust motor 56 as a circulation drive section constituting the circulation means is connected to the exhaust fan 54. The exhaust motor 56 is electrically connected to the control device, and when the exhaust motor 56 is driven under the control of the control device, the exhaust fan 54 is rotated, and the air in the left heating chamber 44 and the right heating chamber 46 is is sucked into the exhaust box 52. Therefore, air from outside the building enters the combustion furnace 30 through the air supply pipe 42B on the outer periphery of the exhaust pipe 58, the air supply relay box 43, the air supply pipe 42A, the air supply box 42, and the ignition pipe 36. be attracted. Further, the air sucked into the air supply box 42 is sucked into the combustion furnace 30 through the air supply cylinder 40, the air supply chamber 34 in the combustion box 28, and the air hole 32 of the roistle 30A of the combustion furnace 30. . Furthermore, the air drawn into the combustion furnace 30 is drawn into the combustion chamber 24 and into the left heating chamber 44 and the right heating chamber 46 through each heating hole 26 of the combustion chamber 24 .

An exhaust pipe 58 is connected to the rear wall of the exhaust box 52, and the inside of the exhaust pipe 58 communicates with the inside of the exhaust box 52, and extends rearward to connect the air supply relay box 43 and the air supply pipe 42B. It is fitted inside. The exhaust pipe 58 extends outside the building (outdoors), and the air sucked into the exhaust box 52 by the exhaust fan 54 is discharged to the outside of the building through the exhaust pipe 58.

On the left side of the left heating chamber 44 and on the right side of the right heating chamber 46, a rectangular left heat exchange chamber 60 and a right heat exchange chamber 62, each serving as a heat exchange chamber, are provided. The portions other than the upper end of the left wall of the right heat exchange chamber 62 are the left wall of the left heating chamber 44 and the right wall of the right heating chamber 46, respectively. The left wall of the left heat exchange chamber 60 and the right wall of the right heat exchange chamber 62 are the left wall and right wall of the housing 12, respectively, and the front and upper walls of the left heat exchange chamber 60 and right heat exchange chamber 62 are the left wall and right wall of the housing 12, respectively. The walls are respectively a seal wall 12A and an upper wall of the housing 12.

On the rear side of the combustion chamber 24, left heating chamber 44, right heating chamber 46, left heat exchange chamber 60, and right heat exchange chamber 62, a substantially rectangular parallelepiped-shaped post heat exchange chamber 64 is provided as a heat exchange chamber. The portions of the front wall of the post-heat exchange chamber 64 other than the upper end, left end, and right end are the rear walls of the combustion chamber 24, the left heating chamber 44, and the right heating chamber 46. The left end and right end of the front wall of the after heat exchange chamber 64 are the rear walls of the left heat exchange chamber 60 and the right heat exchange chamber 62, respectively, and the upper left end and right end of the after heat exchange chamber 64 are , a passage hole 69 opened to the front side is formed and communicated with the upper part of the left heat exchange chamber 60 and the right heat exchange chamber 62, respectively. The left wall, right wall, and upper wall of the after heat exchange chamber 64 are the left wall, right wall, and upper wall of the housing 12, respectively, and the upper part of the rear wall of the after heat exchange chamber 64 is made of a heat insulating structural material. It is connected to the front wall of the hopper 16. The rear wall of the after-heat exchange chamber 64 is penetrated by the conveying cylinder 20A of the supply screw 20, and the lower part of the after-heat exchange chamber 64 is opened to the rear side, so that the lower side of the hopper 16 and the supply screw 20 can be connected to the rear wall of the after-heat exchange chamber 64. It communicates with a ventilation hole 14 in the rear wall of the housing 12 through the opening.

A substantially rectangular parallelepiped-shaped upper heat exchange chamber 66 as a heat exchange chamber is provided above the combustion chamber 24, the left heating chamber 44, and the right heating chamber 46, and the lower wall of the upper heat exchange chamber 66 is connected to the combustion chamber. 24, the upper wall of the left heating chamber 44 and the right heating chamber 46, and the upper wall of the upper heat exchange chamber 66 is the upper wall of the housing 12. The front wall of the upper heat exchange chamber 66 is the seal wall 12A of the housing 12, and the left wall, right wall, and rear wall of the upper heat exchange chamber 66 are the right wall and right heat exchange chamber 60, respectively. The left wall of the exchange chamber 62 and the front wall of the post-heat exchange chamber 64 are provided. A plurality of rectangular passage holes 68 are formed through the left wall, right wall, and rear wall of the upper heat exchange chamber 66, respectively. The holes 68 communicate the upper heat exchange chamber 66 with the upper ends of the left heat exchange chamber 60, the right heat exchange chamber 62, and the post heat exchange chamber 64, respectively. A plurality of rectangular slits 70 serving as openings are formed through the upper wall of the upper heat exchange chamber 66, and the plurality of slits 70 open the upper heat exchange chamber 66 to the upper chamber of the housing 12. ing.

A rectangular parallelepiped hot air chamber 72 is provided below the combustion chamber 24, left heating chamber 44, and right heating chamber 46, and the left and right ends of the hot air chamber 72 are connected to the left heat exchange chamber 60, respectively. and communicates with the lower end of the right heat exchange chamber 62. The lower wall of the hot air chamber 72 is the lower wall of the casing 12, and the front wall of the hot air chamber 72 is the front wall of the casing 12. A shutter-shaped air outlet 74 is formed through the front wall of the warm air chamber 72, and the air outlet 74 opens the warm air chamber 72 to the room on the front side of the lower end of the housing 12.

A hot air fan 76 is provided in the hot air chamber 72, and a hot air motor 78 is connected to the hot air fan 76. The hot air motor 78 is electrically connected to the control device, and when the hot air motor 78 is driven under the control of the control device, the hot air fan 76 is rotated, and the air in the hot air chamber 72 is blown. It is blown out from the outlet 74 to the front side. Therefore, the indoor air on the rear side of the casing 12 is sucked into the post heat exchange chamber 64 through the vent 14 on the rear wall of the casing 12, and the plurality of passage holes 68 on the rear wall of the upper heat exchange chamber 66 and is sucked into the left heat exchange chamber 60 and right heat exchange chamber 62 through the upper passage holes 69 of the left heat exchange chamber 60 and right heat exchange chamber 62, respectively. . Moreover, the air in the room above the housing 12 is sucked into the upper heat exchange chamber 66 through the plurality of slits 70 in the upper wall of the upper heat exchange chamber 66. Furthermore, the air sucked into the upper heat exchange chamber 66 is sucked into the left heat exchange chamber 60 and the right heat exchange chamber 62 through the plurality of passage holes 68 in the left and right walls of the upper heat exchange chamber 66, respectively. . Moreover, the air sucked into the left heat exchange chamber 60 and the right heat exchange chamber 62 is sucked into the warm air chamber 72.

Next, the operation of this embodiment will be explained.

In the pellet stove 10 having the above configuration, the supply motor 20C in the supply screw 20 is driven by the control of the control device, and the screw 20B is rotated, so that the wood pellets 18 in the hopper 16 are transferred into the conveyance tube 20A. It flows down and is transported inside the transport cylinder 20A. Furthermore, the wood pellets 18 conveyed within the conveying tube 20A are flown down within the supply tube 20D and into the combustion furnace 30 in the combustion chamber 24.

Further, the exhaust motor 56 is driven under the control of the control device, and the exhaust fan 54 is rotated, so that the air in the left heating chamber 44 and the right heating chamber 46 is sucked into the exhaust box 52, and the air is drawn into the exhaust pipe 58. It is discharged to the outside of the building via the inside. Therefore, air from outside the building is sucked into the combustion furnace 30 through the air supply pipe 42B on the outer periphery of the exhaust pipe 58, the air supply relay box 43, the air supply pipe 42A, the air supply box 42, and the ignition pipe 36. be done. Further, the air sucked into the air supply box 42 is sucked into the combustion furnace 30 through the air supply cylinder 40, the air supply chamber 34 in the combustion box 28, and the air hole 32 of the roistle 30A of the combustion furnace 30. . Furthermore, the air drawn into the combustion furnace 30 is drawn into the combustion chamber 24 and into the left heating chamber 44 and the right heating chamber 46 through each heating hole 26 of the combustion chamber 24 .

Moreover, under the control of the control device, the ignition heater 38 generates heat and heats the air within the ignition tube 36. Therefore, the air is sucked into the combustion furnace 30 and heats the wood pellets 18 in the combustion furnace 30, whereby the wood pellets 18 are ignited. Further, air in the air supply chamber 34 is sucked (injected) into the combustion furnace 30 through the air hole 32 of the roistle 30A of the combustion furnace 30. As a result, the wood pellets 18 are burned and a flame F rises above the combustion furnace 30, thereby heating the air in the combustion chamber 24 and passing the air through each heating hole 26 of the combustion chamber 24 to the left. It is sucked into the heating chamber 44 and the right heating chamber 46. Incidentally, ash is generated by the combustion of the wood pellets 18 and scattered into the combustion chamber 24, but the ash falls naturally and is stored in the ash receiving tray 48.

Furthermore, by driving the hot air motor 78 under the control of the control device, the hot air fan 76 is rotated, and the air in the hot air chamber 72 is blown out from the air outlet 74 to the front side. Therefore, the indoor air on the rear side of the casing 12 is sucked into the post heat exchange chamber 64 through the vent 14 on the rear wall of the casing 12, and the plurality of passage holes 68 on the rear wall of the upper heat exchange chamber 66 and is sucked into the left heat exchange chamber 60 and right heat exchange chamber 62 through the upper passage holes 69 of the left heat exchange chamber 60 and right heat exchange chamber 62, respectively. . Moreover, indoor air above the housing 12 is sucked into the upper heat exchange chamber 66 through the plurality of slits 70 in the upper wall of the upper heat exchange chamber 66 . Furthermore, the air sucked into the upper heat exchange chamber 66 is sucked into the left heat exchange chamber 60 and the right heat exchange chamber 62 through the plurality of passage holes 68 in the left and right walls of the upper heat exchange chamber 66, respectively. . Moreover, the air sucked into the left heat exchange chamber 60 and the right heat exchange chamber 62 is sucked into the warm air chamber 72.

As a result, the air in the after-heat exchange chamber 64 is connected to the heated air in the combustion chamber 24 via the front wall of the after-heat exchange chamber 64 (the rear wall of the combustion chamber 24, left heating chamber 44, and right heating chamber 46). Heat is exchanged between the two and heated. Furthermore, the air in the upper heat exchange chamber 66 passes through the lower wall of the upper heat exchange chamber 66 (the upper wall of the combustion chamber 24, the left heating chamber 44, and the right heating chamber 46) to the combustion chamber 24, the left heating chamber 44, and the right heating chamber. Heat is exchanged with the heated air in the chamber 46 and heated. Also, the air in the left heat exchange chamber 60 is heated by exchanging heat with the heated air in the left heating chamber 44 via the right wall of the left heat exchange chamber 60 (the left wall of the left heating chamber 44). . Furthermore, the air in the right heat exchange chamber 62 is heated by exchanging heat with the heated air in the right heating chamber 46 via the left wall of the right heat exchange chamber 62 (the right wall of the right heating chamber 46). .

Therefore, the air heated in the rear heat exchange chamber 64, the upper heat exchange chamber 66, the left heat exchange chamber 60, and the right heat exchange chamber 62 is sucked into the hot air chamber 72 by the hot air fan 76, and the air is drawn into the hot air chamber 72 through the air outlet 74. It is blown out into the room on the front side of the lower end of the casing 12. Therefore, the air in the room is heated by forced convection by the pellet stove 10, and is heated in a short time with less temperature unevenness.

By the way, when the wood pellets 18 in the combustion furnace 30 are heated by the air heated by the ignition heater 38 in the ignition tube 36 and ignited, the properties of the wood pellets and the amount of ash into the combustion furnace 30 are determined. A large amount of combustible gas (white smoke) is generated due to the degree of residual gas and the temperature of the air outside the building sucked into the ignition tube 36 and combustion furnace 30, and the combustible gas ignites at once ( There is a possibility that the internal pressure of the combustion chamber 24 will rise rapidly due to the occurrence of so-called explosive combustion.

Here, when the internal pressure of the combustion chamber 24 increases rapidly, the opening/closing door 22 is pushed forward by the internal pressure of the combustion chamber 24, so that the opening/closing door 22 resists the urging force of the compression coil ring 86. Then, the biasing plate 80 is rotated forward with respect to the regulation plate 82, and the opening/closing door 22 is rotated forward (see FIG. 6). Therefore, depending on the degree of increase in the internal pressure of the combustion chamber 24, the closure of the combustion chamber 24 by the opening/closing door 22 is released, and the air in the combustion chamber 24 is released to the outside of the housing 12. It is possible to suppress the internal pressure from increasing rapidly. Thereby, damage to the opening/closing door 22 (for example, the heat-resistant glass 22B) can be suppressed.

Furthermore, the opening/closing door 22 is rotated to open and close. Therefore, when the internal pressure of the combustion chamber 24 increases rapidly, the closure of the combustion chamber 24 by the opening/closing door 22 can be released by rotating the opening/closing door 22, and the closing of the combustion chamber 24 by the opening/closing door 22 can be released by sliding the opening/closing door 22. Unlike the case where the closure of the combustion chamber 24 is released by the opening/closing door 22, the closure of the combustion chamber 24 by the opening/closing door 22 can be easily released.

Further, in the opening/closing door 22, a compression coil ring 86 is provided between the biasing plate 80 and the regulating plate 82. Therefore, when the regulation hook of the regulation mechanism is hooked on the regulation pin 82C of the regulation plate 82 and the rotation of the opening/closing door 22 is regulated, and when the regulation hook is released from the regulation pin 82C and the opening/closing door 22 is When the rotation restriction is released, the compression coil ring 86 can absorb the load from the restriction hook to the restriction plate 82 (including the restriction pin 82C), and the restriction mechanism restricts and regulates the rotation of the opening/closing door 22. Cancellation can be easily performed.

Further, in the opening/closing door 22, the compression coil ring 86 urges the biasing plate 80 rearwardly with respect to the regulating plate 82, thereby biasing the opening/closing door 22 rearward. Therefore, even if the gasket 22A of the opening/closing door 22 deteriorates over time, the sealing performance between the sealing wall 12A of the housing 12 and the opening/closing door 22 by the gasket 22A can be maintained due to the biasing force of the compression coil ring 86. Thereby, even if the pellet stove 10 is used for a long time, the ability to close the combustion chamber 24 by the opening/closing door 22 can be maintained.

In this embodiment, a compression coil ring 86 is provided between the opening/closing door 22 (biasing plate 80) and the regulating plate 82. However, the compression coil ring 86 may be provided between the opening/closing door 22 or the housing 12 and the bearing of the rotation shaft 22C.

Furthermore, in this embodiment, the opening/closing door 22 is made rotatable. However, the opening/closing door 22 may be made slidable.

Moreover, in this embodiment, the case where the present invention was applied to the pellet stove 10 was explained. However, the present invention can also be applied to boilers that use wood pellets as fuel.

10 Pellet stove (wood pellet combustion device)
18 Wood pellets 22 Opening/closing door 24 Combustion chamber 82 Regulation plate (regulation part)
86 Compression coil ring (biasing means)

Claims (3)

a combustion chamber in which wood pellets are burned to heat the air;
an opening/closing door that forms a peripheral wall of the combustion chamber and opens the combustion chamber;
It is provided only on the opening/closing door side or only on the combustion chamber side other than the opening/closing door, and applies a biasing force to the opening/closing door so that the opening/closing door closes the combustion chamber and increases the internal pressure of the combustion chamber. biasing means for releasing the closure of the combustion chamber by the opening/closing door against a biasing force;
A wood pellet combustion device equipped with The wood pellet combustion apparatus according to claim 1, wherein the opening/closing door is rotated to open and close. Claim 1 or claim 2, further comprising a regulating portion provided on the opening/closing door, the movement of which is restricted to restrict opening of the opening/closing door, and the urging means is provided to apply a biasing force to the opening/closing door. The wood pellet combustion device according to 2.