JP4044872B2 - Pellet stove igniter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention particularly relates to an ignition device applied to a pellet stove capable of burning a processed fuel (wood pellets) made by pulverizing and compressing thinned wood.
[0002]
[Prior art]
Conventionally, a pellet stove that uses a processed fuel (wood pellets) made by pulverizing and compressing thinned wood as a fuel is known (for example, see Patent Document 1).
[0003]
In such a pellet stove, the processed fuel stored in the hopper of the pellet stove is conveyed to the upper surface of a flat combustion shelf (rooster) installed in the combustion chamber by a screw conveyor. The combustion shelf is formed with a plurality of vent holes, and air is supplied from below the combustion shelf by a blower. And when this pellet stove is ignited, the canopy provided on the top of the pellet stove is opened, kerosene or the like is applied to the processed fuel conveyed to the upper surface of the combustion shelf, and it is configured to ignite with a match or the like. .
[0004]
For this reason, there is a problem that the work for igniting the processed fuel is troublesome, and there is a demand for the development of a pellet stove igniter capable of easily and quickly igniting the processed fuel. Further, in such a pellet stove ignition device, it is necessary to ensure not only easy and rapid performance but also durability against the ignition device.
[0005]
[Patent Document 1]
Japanese Patent Publication No. 2-43964
[0006]
[Problems to be solved by the invention]
The present invention has been made in consideration of the above facts, and an object of the present invention is to provide an ignition device for a pellet stove that can easily and quickly ignite a processed fuel and that has improved durability.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, an ignition device for a pellet stove according to the first aspect of the present invention is provided in a combustion chamber, and a combustion shelf that can place a processed fuel on its upper surface and has air permeability, and a fuel tank The combustion shelf is applied to a pellet stove having a fuel conveying device for conveying the processed fuel stored in the upper surface of the combustion shelf and a blower for sending air from below the combustion shelf to the combustion chamber An ignition device for igniting the processed fuel conveyed to the upper surface of the metal plate, provided below the combustion shelf, deformed by heating and returned to its original shape by cooling, and the bimetal It is supported and provided below the combustion shelf, and generates heat by energization to heat and deform the bimetal, so that at least a part protrudes from the upper surface of the combustion shelf and is conveyed to the upper surface of the combustion shelf. In addition to igniting the processed fuel, the energization is cut off after the ignition is completed, and the projecting portion is retracted below the combustion shelf by cooling the bimetal to the original shape by the air sent from the blower. And a heater.
[0008]
In the pellet stove ignition device according to the first aspect, the processed fuel stored in the fuel tank is transported to the upper surface of the combustion shelf provided in the combustion chamber by the fuel transport device. An ignition device is provided below the combustion shelf. This ignition device includes a bimetal and a heater supported by the bimetal.
[0009]
Here, when the heater is energized and the heater generates heat, the bimetal is heated and deformed, and at least a part of the heater supported by the bimetal protrudes from the upper surface of the combustion shelf. For this reason, at least a part of the heated heater contacts the processed fuel conveyed to the upper surface of the combustion shelf, and the processed fuel on the upper surface of the combustion shelf is heated and ignited. At this time, air is sent from below the combustion shelf by the blower, and this air passes through the breathable combustion shelf and is supplied to the upper surface of the combustion shelf to which the processed fuel is conveyed. Thereby, the processing fuel on the combustion shelf upper surface burns.
[0010]
On the other hand, when the ignition to the processed fuel is completed and the energization to the heater is interrupted, the bimetal is cooled by the air from the blower sent from below the combustion shelf and returns to its original shape. For this reason, in the heater supported by the bimetal, the protruding portion that protrudes from the upper surface of the combustion shelf retracts below the combustion shelf. Therefore, the heater is not heated unnecessarily in the state where the processed fuel is combusted, thereby improving the durability of the ignition device.
[0011]
Thus, in the pellet stove ignition device according to the first aspect, the processed fuel can be easily and quickly ignited, and the durability is improved.
[0012]
A pellet stove igniter according to a second aspect of the present invention includes a combustion shelf provided in a combustion chamber, capable of mounting a processed fuel on an upper surface and having air permeability, and the processed fuel stored in a fuel tank. Processed fuel applied to a pellet stove having a fuel transfer device for transferring to the upper surface of the combustion shelf, and a blower for sending air from below the combustion shelf to the combustion chamber, and transferred to the upper surface of the combustion shelf An ignition device for igniting the bimetal, which is provided on the lower surface of the combustion shelf, deforms by being heated by the heat transferred from the combustion shelf, and returns to its original shape by being cooled. While being supported in an adiabatic state, at least part of the combustion shelf is disposed so as to protrude from the upper surface of the combustion shelf, and generates heat by energization to ignite the processed fuel conveyed to the upper surface of the combustion shelf and Is deenergized to After the completion, is characterized in that said projecting portion by deforming the bimetal is heated with a heater to be saved below the combustion shelves by transmitting heat from the combustion shelves.
[0013]
In the pellet stove ignition device according to the second aspect, the processed fuel stored in the fuel tank is transported to the upper surface of the combustion shelf provided in the combustion chamber by the fuel transport device. A bimetal constituting the ignition device is provided on the lower surface of the combustion shelf. The bimetal supports the heater in a thermally insulated state, and at least a part of the heater is disposed so as to protrude from the upper surface of the combustion shelf. For this reason, the processed fuel conveyed to the upper surface of the combustion shelf contacts the protruding portion of the heater.
[0014]
Here, when the heater is energized and the heater generates heat, the processed fuel on the upper surface of the combustion shelf is heated and ignited. At this time, air is sent from below the combustion shelf by the blower, and this air passes through the breathable combustion shelf and is supplied to the upper surface of the combustion shelf to which the processed fuel is conveyed. Thereby, the processing fuel on the combustion shelf upper surface burns. When the ignition of the processed fuel is completed in this way, the energization to the heater is interrupted.
[0015]
On the other hand, when the combustion shelf is heated by the combustion of the processed fuel, the heat of the combustion shelf is transmitted to the bimetal and the bimetal is deformed, and the heater supported by the bimetal burns the protruding portion that protruded from the upper surface of the combustion shelf Retreat below the shelf. Therefore, the heater is not heated unnecessarily in the state where the processed fuel is combusted, thereby improving the durability of the ignition device.
[0016]
On the other hand, when the use of the pellet stove is stopped, the bimetal is cooled and returns to its original shape. As a result, at least a part of the heater supported by the bimetal protrudes again to the upper surface of the combustion shelf, so that the processed fuel on the upper surface of the combustion shelf can be ignited.
[0017]
Thus, in the pellet stove ignition device according to claim 2, the processed fuel can be easily and quickly ignited, and the durability is improved.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
FIG. 1 is a side sectional view showing a configuration of a pellet stove 10 configured by applying the ignition device 70 according to the first embodiment of the present invention. FIG. 2 shows the configuration of the pellet stove 10 in a cross-sectional view.
[0019]
The pellet stove 10 includes a housing 12. A hopper 16 serving as a fuel tank is disposed inside the housing 12. Inside this hopper 16 is a wood pellet 14 which is a processed fuel made by pulverizing and compressing thinned wood (in this embodiment, for example, it is formed into a cylindrical shape and has a diameter of 4 mm to 5 mm). About 5 mm to 6 mm in length).
[0020]
A fuel transfer device 18 is provided below the hopper 16. The fuel transfer device 18 includes an upper screw 20 and a lower screw 22 that are arranged in two steps, upper and lower. The upper screw 20 and the lower screw 22 are rotated by the power of the motor 24. The motor 24 is connected to the control circuit 38 via a wiring (not shown) disposed on the pellet stove 10.
[0021]
Further, a fuel lowering port 26 is formed in the lower part of the hopper 16, and the wood pellets 14 put into the hopper 16 are scraped out from the fuel lowering port 26 by the upper screw 20 and conveyed to the chute 28. Fall. The wood pellets 14 that have fallen from the chute 28 are pushed out toward the combustion unit 30 side by the lower screw 22 disposed in the lower stage of the fuel transfer device 18, and the rooster 32 that is a combustion shelf disposed in the combustion chamber 30. It is supplied to the upper surface (see arrow A in FIG. 1).
[0022]
As shown in FIGS. 2 and 3, the rooster 32 is composed of a plurality of bars supported by the frame 34 in parallel with a frame-like frame 34 at a predetermined interval (interval so that the wood pellet 14 does not fall). 36 to form a fence. The rooster 32 is bent in a substantially “h” shape in a side view, and the parallel portion 32 </ b> A that is a portion on the fuel transfer device 18 side is disposed in parallel to the bottom surface of the housing 12. In addition, the inclined portion 32 </ b> B, which is the portion of the rooster 32 on the side opposite to the fuel transfer device 18, is disposed to be inclined toward the lower side of the housing 12.
[0023]
An ignition device 70 is provided below the parallel portion 32 </ b> A of the rooster 32. The ignition device 70 includes a bimetal 72 and a heater 74. The bimetal 72 is a flat plate that is bent into a substantially “L” shape, and a mounting portion 76 that is in contact with the substantially central portion of the lower surface of the rooster 32 (the lower side of the plurality of bars 36) includes a bolt 78 and a nut. 79 and the stay 80 are fixed to the bar 36 of the rooster 32. A heat insulating material 81 is disposed between the mounting portion 76 of the bimetal 72 and the bar 36 of the rooster 32, and the bimetal 72 is attached to the bar 36 of the rooster 32 in a heat insulating state.
[0024]
Further, in this bimetal 72, the heater support portion 82 is positioned substantially perpendicular to the attachment portion 76. When the bimetal 72 is attached to the lower surface of the rooster 32, the heater support portion 82 is a parallel portion 32 </ b> A of the rooster 32. It protrudes downward substantially perpendicularly.
[0025]
The bimetal 72 is deformed when heated, and in the heated state, the heater support 82 is set to be inclined toward the front side of the pellet stove 10 (right side in FIGS. 1 to 4). (The state shown in FIG. 4).
[0026]
On the other hand, the heater 74 is formed in a round bar shape, and the base end 83 side is inserted into a through hole (not shown) formed in the heater support portion 82 of the bimetal 72. The heater 74 is fixed to the heater support 82 by a nut 84 before and after the through hole is inserted, and the front end 88 is located on the front side of the pellet stove 10 with respect to the heater support 82 (FIGS. 1 to 4). Then, it is arranged to project to the right side). The heater 74 is arranged substantially parallel to the parallel portion 32A of the rooster 72 when the bimetal 72 is in a cooled state (shown in FIG. 3). The heater 74 is connected to the control circuit 38 via a wiring 86 (partially omitted), and generates heat when energization is permitted by the control circuit 38.
[0027]
Here, the heater 74 and the bimetal 72 are fixed in a state in which heat can be transmitted to each other, and energization of the heater 74 is allowed by the control device 38, and when the heater 74 generates heat, the bimetal 72 is heated. It has become so. When the bimetal 72 is heated, the bimetal 72 is deformed as described above, and the heater support 82 of the bimetal 72 is inclined to the front side of the pellet stove 10 (right side in FIGS. 1 to 4). Yes. For this reason, the heater 74 supported by the heater support portion 82 of the bimetal 72 has a tip portion 88 projecting from between the rod members 36 of the rooster 32 to the upper surface of the rooster 32, The distal end portion 88 comes into contact with the wood pellets 14 conveyed to the upper surface of the rooster 32 (shown in FIG. 4).
[0028]
When the energization of the heater 74 is interrupted and the bimetal 72 is cooled, the heater support portion 82 of the bimetal 72 returns to a state (original shape) substantially perpendicular to the parallel portion 32A of the rooster 32 again. The tip end portion 88 of the heater 74 supported by the heater support portion 82 of the bimetal 72 is retracted below the rooster 32 (shown in FIG. 3).
[0029]
On the other hand, a blower 42 is installed below the fuel transfer device 18, air is sent from the blower 42, travels in the direction of arrow B in FIG. 1, and is sent to the air intake chamber 44 (primary air). Air) passes between the rods 36 of the rooster 32 and is ventilated to the combustion chamber 30. The blower 42 is connected to the control circuit 38 via a wiring (not shown) disposed in the pellet stove 10.
[0030]
Further, the air sent from the blower 42 also flows into the air passage 46 (see arrow C in FIG. 1), and is ejected from the air hole 50 formed in the partition plate 48 into the combustion chamber 30 (2 Next air). Further, the air that has flowed into the air passage 46 also flows into the air return passage 52 branched to the fuel transfer device 18 side, and is ejected from above the chute 28 of the fuel transfer device 18.
[0031]
Here, in the present pellet stove 10, the motor 24 of the fuel transfer device 18, the heater 74 of the ignition device 70, and the blower 42 are configured to be centrally controlled by the control circuit 38, and are mounted on the pellet stove 10. When the power switch (not shown) is turned “ON”, the motor 24 and the blower 42 of the fuel transfer device 18 are operated, and the heater 74 of the ignition device 70 is energized.
[0032]
The energization time to the heater 74 of the ignition device 70 can be arbitrarily set by a timer (not shown) connected to the control circuit 38. The energization time to the heater 74 is predetermined time (this embodiment). In the embodiment, the power is automatically cut off by this timer when about 1 minute to 2 minutes).
[0033]
When energization of the heater 74 of the ignition device 70 is started, as described above, the heater 74 generates heat and the bimetal 72 is heated and deformed. For this reason, the heater 74 supported by the heater support portion 82 of the bimetal 72 has a tip 88 protruding from the upper surface of the rooster 32, and the heated pellet 74 of the heater 74 conveyed to the upper surface of the rooster 32. 14 (shown in FIG. 4). Thereby, the wood pellet 14 is heated and ignited. At this time, the primary air (see arrow B in FIG. 1) sent from the blower 42 to the air intake chamber 44 passes between the rods 36 of the rooster 32 and is ventilated to the combustion chamber 30. The wood pellets 14 conveyed to the upper surface are combusted. When the wood pellets 14 on the upper surface of the rooster 32 are burning, the wood pellets 14 in the hopper 16 are sequentially replenished onto the rooster 32 by the upper screw 20 and the lower screw 22 of the fuel conveying device 18 and burned. .
[0034]
When a predetermined time elapses after the energization of the heater 74 of the ignition device 70 is started, the energization of the heater 74 is cut off by the above-described timer. For this reason, the bimetal 72 is cooled by the primary air described above to return to its original shape, and the tip end portion 88 of the heater 74 supported by the bimetal 72 is configured to be retracted below the rooster 32 (the state shown in FIG. 3). ).
[0035]
On the other hand, a thermostat 56 for detecting the temperature in the combustion chamber 30 is fixed to the partition plate 54 between the air passage 46 and the hopper 16. The thermostat 56 is connected to the control circuit 38 via a wiring (not shown) disposed on the pellet stove 10. When the thermostat 56 detects that the temperature in the combustion chamber 30 has reached a predetermined value or higher, the heater 74 of the ignition device 70 is not energized even if the power switch is turned on. The configuration is controlled by the circuit 38.
[0036]
Further, an ash receiving tray 58 is disposed on the opposite side of the rooster 32 from the fuel transfer device 18, and the burned residue (ash) of the burned wood pellet 14 is newly added by the upper screw 20 and the lower screw 22. It is pushed out by the wood pellets 14 refilled on the rooster 32 and falls into the ash tray 58.
[0037]
Note that the wood pellet 14 does not become a powder form even if burned out, and becomes ash with the original shape remaining a little, so that the ash falling from between the rods 36 of the rooster 32 is slight, but below the rooster 32 An ash receiving tray small 60 is disposed in the air intake chamber 44, and the ash of the wood pellet 14 that has fallen into the air intake chamber 44 from between the rods 36 of the rooster 32 falls into the ash receiving tray small 60. It is a configuration.
[0038]
On the other hand, the combustion of the wood pellets 14 may cause the combustion chamber 30 to be filled with combustible gas and inhibit the combustion of the wood pellets 14, but the air is supplied from the blower 42, and from the air hole 50 of the partition plate 48. Combustion of the dry-distillable combustible gas is promoted by the above-described secondary air ejected into the combustion chamber 30.
[0039]
Note that the air that is supplied from the blower 42 and is ejected from above the chute 28 of the fuel transfer device 18 through the air passage 46 and the air return passage 52 is generated by the exhaust gas generated in the combustion chamber 30. Prevent backflow to the side.
[0040]
A cylindrical flue 62 is provided on the upper surface of the housing 12 above the combustion chamber 30, and a baffle plate 64 is disposed inside the combustion chamber 30 below the flue 62. It is fixed to the wall. A plurality of ventilation holes 66 are formed in the baffle plate 64, and the exhaust gas generated in the combustion chamber 30 by the combustion of the wood pellets 14 is in the cylinders of the ventilation holes 66 and the flue 62 of the baffle plate 64. And is discharged from the exhaust pipe (not shown) connected to the flue 62 to the outside of the pellet stove 10 (see arrow D in FIG. 1).
[0041]
Next, the operation of the first embodiment will be described.
[0042]
In the pellet stove 10 configured as described above, when a power switch (not shown) mounted on the pellet stove 10 is turned “ON”, the motor 24 of the fuel transfer device 18 is activated, and the wood pellets 14 stored in the hopper 16 are stored. The upper screw 20 and the lower screw 22 are conveyed to the upper surface of the rooster 32 disposed in the combustion chamber 30.
[0043]
At this time, the heater 74 of the ignition device 70 is also energized, and the heater 74 generates heat. For this reason, the bimetal 72 is heated and deformed, and the heater support portion 82 of the bimetal 72 is inclined to the front side (right side in FIGS. 1 to 4) of the pellet stove 10. Thereby, the tip end portion 88 of the heater 74 supported by the heater support portion 82 of the bimetal 82 protrudes from the upper surface of the rooster 32 (as shown in FIG. 4). Therefore, the tip 88 of the heated heater 74 comes into contact with the wood pellet 14 conveyed to the upper surface of the rooster 32, and the wood pellet 14 on the upper surface of the rooster 32 is heated and ignited.
[0044]
Further, at this time, the air blower 42 is operated so that the air (primary air) sent from the air blower 42 to the air intake chamber 44 passes between the rods 36 of the rooster 32 and the wood on the upper surface of the rooster 32. It is supplied to the pellet 14. Thereby, the wood pellet 14 on the upper surface of the rooster 32 ignited by the ignition device 70 burns.
[0045]
On the other hand, when the ignition to the wood pellet 14 is completed, the timer 74 connected to the control circuit 38 cuts off the energization to the heater 74 (in this embodiment, one minute after the energization to the heater 74 is started). It is blocked after about 2 minutes). For this reason, the bimetal 72 is cooled by the primary air supplied from below the rooster 32 and returns to its original shape (the state shown in FIG. 3), and the heater 74 supported by the heater support portion 82 of the bimetal 72 is The tip portion 88 retracts below the rooster 32. Thereby, it is prevented that the heater 74 is heated unnecessarily in a state where the wood pellet 14 is burning, and the durability of the ignition device 70 is improved.
[0046]
Thus, in the pellet stove 10 having the above-described configuration, the wood pellet 14 can be easily and quickly ignited, and the durability of the ignition device 70 is improved.
[0047]
In addition, the heater 74 of the ignition device 70 is automatically turned off by a timer connected to the control circuit 38 after a predetermined time (about 1 to 2 minutes in the present embodiment) has elapsed since the start of power supply. After the ignition to the wood pellet 14 is completed, the bimetal 72 and the heater 74 are not unnecessarily heated, and the durability of the ignition device 70 is improved.
[0048]
Further, in the state where the thermostat 56 detects that the temperature in the combustion chamber 30 is equal to or higher than a predetermined value during combustion of the wood pellet 14, the ignition circuit is operated by the control circuit 38 even if the power switch is operated to “ON”. The energization to the heater 74 of 70 is blocked. For this reason, it is prevented that the heater 74 and the bimetal 72 are heated unnecessarily in the state where the wood pellet 14 is burning, and the durability of the ignition device 70 is improved.
[0049]
(Second Embodiment)
Next, a second embodiment of the present invention will be described. In addition, about the structure and operation | movement fundamentally the same as the said 1st Embodiment, the same code | symbol as the said 1st Embodiment is attached | subjected and the description is abbreviate | omitted.
[0050]
FIG. 5 is a side sectional view showing the configuration of the main part including the ignition device 100 of the pellet stove 102 configured by applying the ignition device 100 according to the second embodiment of the present invention.
[0051]
The pellet stove 102 has basically the same configuration as the pellet stove 10 of the first embodiment, and has a configuration in which an ignition device 100 is applied instead of the ignition device 70 applied in the pellet stove 10. is there.
[0052]
As shown in FIG. 5, the ignition device 100 includes a bimetal 104 and a heater 106. The bimetal 104 is a flat plate bent in a substantially “h” shape, and a mounting portion 108 that is in contact with a substantially central portion of the lower surface of the rooster 32 (the lower side of the plurality of bars 36) includes a bolt 78 and a nut. 79 and the stay 80 are fixed to the bar 36. Unlike the ignition device 70 described above, there is no heat insulating material between the mounting portion 108 of the bimetal 104 and the bar 36 of the rooster 32, and the bimetal 104 and the bar 36 of the rooster 32 are mutually heated. Transmission is possible.
[0053]
Further, in this bimetal 104, the heater support portion 110 is inclined at a predetermined angle with respect to the attachment portion 108. When the bimetal 104 is attached to the lower surface of the rooster 32, the heater support portion 108 has an upper end (the attachment portion 108 and the heater support portion). The lower end is located on the front side of the pellet stove 10 (the right side in FIGS. 5 and 6) than the portion where the portion 110 is continuous.
[0054]
The bimetal 104 is deformed when heated. In the heated state, the bimetal 104 is set so that the heater support portion 110 is disposed at a position substantially perpendicular to the parallel portion 32A of the rooster 32 ( (See FIG. 6).
[0055]
In addition, a circular through hole (not shown) is formed in the heater support portion 110, and a substantially cylindrical heat insulating material 114 is fitted into the through hole. The base end portion 108 side of the round bar heater 106 is inserted into the cylinder of the heat insulating material 114, and the portion before and after the insertion is fixed to the heat insulating material 114 by a nut 118. For this reason, the heater 106 is supported by the bimetal 104 in a thermally insulated state. The heater 106 is connected to the control circuit 38 described above via a wiring 122 (partially omitted), and generates heat when energization is permitted by the control circuit 38.
[0056]
Here, the heater 106 is disposed so that the tip 120 protrudes from the heater support 110 of the bimetal 104 to the front side of the pellet stove 10 (the right side in FIGS. 5 and 6), and the bimetal 104 is in a cooled state. In some cases, the tip 120 is disposed so as to protrude from between the rods 36 of the rooster 32 to the upper surface of the rooster 32 (shown in FIG. 5).
[0057]
Further, in a state where the bimetal 104 is heated and deformed, and the heater support portion 110 of the bimetal 104 is disposed at a position substantially perpendicular to the parallel portion 32A of the rooster 32, the heater 106 has a rooster as shown in FIG. It is arranged substantially parallel to 32 parallel portions 32A. For this reason, when the bimetal 104 is heated and deformed, the tip 120 of the heater 106 is retracted below the rooster 32 (shown in FIG. 6).
[0058]
Next, the operation of the second embodiment will be described.
[0059]
In the pellet stove 102 configured as described above, when a power switch (not shown) mounted on the pellet stove 102 is turned “ON”, the motor 24 of the fuel transfer device 18 is activated, and the wood pellets 14 stored in the hopper 16 are discharged. The upper screw 20 and the lower screw 22 are conveyed to the upper surface of the rooster 32 disposed in the combustion chamber 30. A front end portion 120 of the heater 106 protrudes from the upper surface of the rooster 32. For this reason, the wood pellet 14 conveyed to the upper surface of the rooster 32 contacts the tip portion 120 of the heater 106.
[0060]
At this time, since the heater 106 of the ignition device 100 is also energized, the heater 106 generates heat, and the wood pellet 14 on the upper surface of the rooster 32 is heated and ignited. Further, at this time, the air blower 42 is operated so that the air (primary air) sent from the air blower 42 to the air intake chamber 44 passes between the rods 36 of the rooster 32 and the wood on the upper surface of the rooster 32. It is supplied to the pellet 14. Thereby, the wood pellet 14 on the upper surface of the rooster 32 ignited by the ignition device 100 burns.
[0061]
When the ignition to the wood pellet 14 is completed, the energization to the heater 74 is cut off by a timer connected to the control circuit 38. (In this embodiment, the heater 106 is shut off after about 1 to 2 minutes have elapsed since the start of energization of the heater 106.)
On the other hand, when the rooster 32 is heated by the combustion of the wood pellets 14, the heat of the rooster 32 is transmitted to the bimetal 104 and the bimetal 104 is deformed, and the heater support portion 110 of the bimetal 104 is in contact with the parallel portion 32 </ b> A of the rooster 32. Arranged in a substantially vertical position. For this reason, as for the heater 106 supported by the heater support part 110 of the bimetal 104, the front-end | tip part 120 retracts below the rooster 32 (state shown in FIG. 6). Therefore, the heater 106 is prevented from being unnecessarily heated while the wood pellets 14 are burning, and the durability of the ignition device 100 is improved.
[0062]
On the other hand, when the use of the pellet stove 102 is stopped, the bimetal 104 is cooled and returns to its original shape (the state shown in FIG. 5). Thereby, the heater 106 supported by the heater support part 110 of the bimetal 104 is in a state in which the wood pellet 14 on the upper surface of the rooster 32 can be ignited because the tip portion 120 protrudes again to the upper surface of the rooster 32. .
[0063]
Thus, with the pellet stove 102 having the above-described configuration, the wood pellet 14 can be easily and quickly ignited, and the durability of the ignition device 100 is improved.
[0064]
[Supplement of Embodiment]
In the first embodiment and the second embodiment described above, the bimetal 72, 104 is attached to the substantially central portion of the lower surface of the rooster 32. However, the present invention is not limited to this, and the bimetal 72, 104 is attached to the rooster 32. It is good also as a structure attached to the site | part of the lower surface blower 42 side (front side of the pellet stoves 10 and 102). In this case, the heaters 74 and 106 are arranged so that the respective tip portions 88 and 120 protrude toward the rear side (left side in FIGS. 1 to 6) of the pellet stoves 10 and 102, respectively. .
[0065]
Further, in the first embodiment and the second embodiment described above, the heaters 74 and 106 are configured such that the tip portions 88 and 120 protrude from the upper surface of the rooster 32. By appropriately setting and changing the shape of the bimetal, the mounting position, the deformation ratio, the shape of the heater, and the like, the entire heater or the intermediate portion can be configured to protrude from the upper surface of the rooster 32.
[0066]
Furthermore, in 1st Embodiment and 2nd Embodiment mentioned above, although the rooster 32 was comprised with the frame-shaped frame 34 and the several bar 36, not only this but the rooster 32, Any material can be used as long as the wood pellets 14 can be placed on the upper surface and has air permeability. For example, the rooster may be a perforated plate or a mesh plate in which a plurality of holes are formed.
[0067]
【The invention's effect】
As described above, according to the pellet stove ignition device of the present invention, the processed fuel can be easily and quickly ignited, and the durability is improved.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a configuration of a pellet stove configured by applying an ignition device according to a first embodiment.
FIG. 2 is a cross-sectional view showing a configuration of a pellet stove configured by applying the ignition device according to the first embodiment.
FIG. 3 is a side sectional view showing a configuration of a main part of the pellet stove including the ignition device according to the first embodiment, and showing a state in which the bimetal is cooled and the front end of the heater is retracted below the rooster. is there.
FIG. 4 is a side cross-sectional view showing a configuration of a main part of a pellet stove including an ignition device according to the first embodiment, showing a state in which a bimetal is heated and deformed and a front end portion of the heater protrudes from an upper surface of the rooster FIG.
FIG. 5 is a side sectional view showing a configuration of a main part of a pellet stove including an ignition device according to the second embodiment, and showing a state in which a bimetal is cooled and a front end portion of a heater protrudes from an upper surface of a rooster. is there.
FIG. 6 is a side sectional view showing a configuration of a main part of a pellet stove including an ignition device according to the second embodiment, and showing a state in which a bimetal is heated and deformed and a front end portion of the heater is retracted below the rooster FIG.
[Explanation of symbols]
10 Pellet stove
14 Wood pellets (processed fuel)
16 Hopper (fuel tank)
18 Fuel transfer device
30 Combustion chamber
32 Rostor (combustion shelf)
42 Blower
70 Ignition system
72 bimetal
74 Heater
100 Ignition device
102 Pellet stove
104 bimetal
106 Heater

Claims (2)

A combustion shelf provided in the combustion chamber and capable of mounting a processed fuel on the upper surface and having air permeability, a fuel transfer device for transferring the processed fuel stored in a fuel tank to the upper surface of the combustion shelf, and the combustion An igniter that ignites the processed fuel that is applied to a pellet stove having a blower that sends air to the combustion chamber from below the shelf, and is conveyed to the upper surface of the combustion shelf;
A bimetal provided below the combustion shelf, deformed by being heated and returning to its original shape by being cooled;
Supported by the bimetal, provided below the combustion shelf, heated by heat and deformed by energizing the bimetal, at least a part protrudes from the upper surface of the combustion shelf and is transferred to the upper surface of the combustion shelf The process fuel is ignited, the energization is interrupted after the ignition is completed, and the projecting portion is retracted below the combustion shelf by cooling the bimetal to the original shape by the air sent from the blower. A heater,
A pellet stove igniter characterized by comprising: A combustion shelf provided in the combustion chamber and capable of mounting a processed fuel on the upper surface and having air permeability, a fuel transfer device for transferring the processed fuel stored in a fuel tank to the upper surface of the combustion shelf, and the combustion An igniter that ignites the processed fuel that is applied to a pellet stove having a blower that sends air to the combustion chamber from below the shelf, and is conveyed to the upper surface of the combustion shelf;
Bimetal provided on the lower surface of the combustion shelf, deformed by being heated by heat transferred from the combustion shelf, and returned to its original shape by being cooled,
The bimetal is supported in an adiabatic state, and at least a part thereof is arranged to protrude from the upper surface of the combustion shelf, and generates heat by energization to ignite the processed fuel conveyed to the upper surface of the combustion shelf, and after completion of ignition A heater that is de-energized, and that the projecting portion is retracted below the combustion shelf by heating and deforming the bimetal by heat transferred from the combustion shelf;
A pellet stove igniter characterized by comprising:

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