JP5030111B2 - Ash removal means for solid fuel combustion equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ash removing means for a solid fuel combustion device, preventing deformation and deterioration due to heat by making stirring blades wait while preventing intervention of stirring blades in a combustion part, preventing effects on combustion wind passing through slits of a combustion tray by the stirring blades, promptly removing ash in the central part during combustion to achieve the good combustion state in the central part and enabling ignition by supply of small amount of fuel and continuation of small amount combustion by moving fuel supplied to the entire combustion tray to the central direction. <P>SOLUTION: The stirring blade provided in the ash removing means is arranged within 180&deg; of a rotating body in cross sectional view while the angle is gradually shifted from the adjacent stirring blade. During waiting of the ash removing means, the stirring blades are positioned without intervening in the slits of the combustion tray, and solid fuel and fixed ash within the combustion tray are moved to a desired position by changing the rotating direction of the rotating body. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a solid fuel combusted using a solid fuel formed by pulverizing, compressing and thinning thinned wood, driftwood, woody building waste, etc. into a pellet, and removing the ash of the solid fuel combustion device provided with a combustion agitation and combustion ash removal device It relates to means.

  The momentum of global environmental protection measures is increasing, and one of them is the rapid increase in the development and use of alternative fuels that have relatively little impact on the environment. Therefore, in recent years, it is well known that the development of biomass fuels that are effective for environmental problems has been activated. In particular, thinned wood, driftwood, and wood-based building waste materials that have been incinerated until now are compression-molded into a fixed grain shape and used as a solid fuel for combustion devices and heaters.

  Solid fuel becomes ash after combustion, and the amount varies depending on the type of fuel.However, the accumulation of ash in the fuel pan may hinder the flow of combustion air and make the combustion state unstable. As in Japanese Unexamined Patent Application Publication No. 2004-270980 (Patent Document 1), Japanese Patent Application Laid-Open No. 2005-201575 (Patent Document 2) and Japanese Patent Application Laid-Open No. 2006-266546 (Patent Document 3), the ash is forcibly removed and the combustion state is stable. Devices for maintaining this are known.

  Patent Document 1 describes an apparatus that removes ash after combustion by including a rod-shaped movable body that scrapes the fire bed while reciprocating along a slot in a grate at the bottom of the combustion section. Further, in Patent Document 2, an apparatus that forcibly removes ash by providing a blade that rotates horizontally and scrapes off at the bottom of a circular combustion section provided with a plurality of holes is further disclosed in Patent Document 3, and further, A configuration is described in which ash and clinker after combustion are discharged out of the machine by a plurality of blades rotating in a vertical direction through a plurality of slits provided on the bottom surface.

JP-A-2004-270980 JP 2005-201575 A JP 2006-266546 A

  Since the rod-like movable body is always in the combustion part as in the above-mentioned Patent Document 1, there is a problem that it is exposed to high-temperature heat to cause deformation and glassy adhesion, and deterioration due to oxidation is quick. Moreover, although the scraping blade | wing which rotates horizontally is provided in the bottom part of the circular combustion part which provided the several hole like patent document 2, the hole provided in the bottom part of the combustion part is clogged with solidified ash etc. In addition, it is difficult to prevent the combustion air from flowing, and the combustion is likely to be unstable. Further, the deformation and deterioration of the blades are likely to proceed due to the heat of combustion, and it is difficult to keep the function stable for a long time. And in patent document 3, although it is the structure which provides the rotating shaft provided with the stirring blade on the lower side of the combustion dish which provided the slit in the bottom face, it rotates through the slit of the bottom face of a combustion dish, If it stops in a state where it is inside, it will interfere with the filling of solid fuel, the combustion will become unstable, the flow of combustion air will be hindered, and the ignition air flow through the heater will be uneven during ignition, resulting in poor ignition In addition, there is a problem that the ash is difficult to fall off and the stirring blade is deformed and corroded quickly by heat.

  Since a plurality of agitating blades simultaneously pass through the slits, the fuel simultaneously contacts each of the agitating blades and impedes its rotation, so that a drive source lock phenomenon for driving the agitating blades to rotate is likely to occur. In order to prevent this, the use of a drive device that generates more torque than necessary complicates the structure and increases the cost.

  When solid fuel is supplied to the combustion part (combustion dish) while sliding or dropping from the upper part of the combustion part as in the above-mentioned document, the whole area of the combustion part (combustion dish) and corners that do not want to supply much fuel are included. Since it is supplied to the entire surface of the combustion dish, it is difficult to carry out a small amount of combustion only in a desired part of the place, and even when the heat of combustion is not required, an excessive fuel supply is performed to maintain combustion. End up.

  In addition, the combustion in the central part is fast, and naturally the amount of ash generated naturally increases in the central part, so the amount of fuel in the central part is reduced by the ash generated in the central part, and there is a phenomenon that only the surroundings burn. . In particular, in the case of a pellet stove that uses wood pellets as a burning fuel, the shape of the flame is an important factor due to the healing effect, etc., in order to improve the shape of the flame, the shape of the flame that burns in the center and thins and flickers high The beauty needs to be emphasized, and the quick removal of the ash in the center is also an important factor.

  In order to ignite easily during ignition, it is necessary to place a lot of fuel near the ignition device in the combustion dish. Since fuel was supplied to the whole, excessive combustion was caused immediately after ignition, and efficient combustion could not be performed.

  Therefore, in the present invention, in the ash removal means in which a rotating shaft having a stirring blade is provided on the lower side of the combustion dish and the stirring blade intervenes the slit of the combustion dish, the stirring blade is in the standby state of the ash removal means. Is waiting at a position where it does not intervene in the slit of the combustion dish, the fuel supplied into the combustion dish is supplied without contacting the stirring blades, and the stirring blades are prevented from being deformed or deteriorated by the combustion heat to remove ash. The object of the present invention is to improve the durability of the means and to prevent the combustion air passing through the slit from being suppressed by the stirring blades.

  In addition, by quickly removing the ash in the center during combustion, the combustion state in the center is improved, and the fuel supplied to the entire combustion dish is moved toward the center, thereby igniting with a small amount of fuel supply. An object of the present invention is to provide an ash removal means for a solid fuel combustion apparatus that allows continuation of a small amount of combustion.

  In order to achieve the above object, the present invention proposes an ash removal means for a solid fuel combustion apparatus according to claims 1 to 6.

  That is, the ash removal means of the solid fuel combustion apparatus according to claim 1, wherein the solid fuel combustion apparatus has a box-shaped or bowl-shaped combustion dish in which a plurality of slits are arranged at predetermined intervals and an upper surface on which the solid fuel is deposited is opened. And a combustion chamber composed of a combustion space above the combustion chamber, and an exhaust air portion for discharging the combustion air of the combustion chamber after combustion to the outside of the machine, the combustion configured to pass outside air through the slit of the combustion dish A stirring shaft of a stirring shaft composed of a rotating shaft and a plurality of convex stirring blades on the outer peripheral surface of the slit of the combustion dish, and stirring the solid fuel in the combustion dish, The ash removal means of the solid fuel combustion apparatus configured to drop the ash after combustion that stays in the slit from the slit, and the plurality of stirring blades of the stirring shaft are regularly arranged with respect to the rotation shaft, respectively. Changed and arranged within half a rotation axis Than is.

  The ash removal means of the solid fuel combustion apparatus according to claim 2 is the ash removal means of the solid fuel combustion apparatus according to claim 1, wherein the arrangement of the stirring blades of the stirring shaft intervenes in the slit from the center of the combustion dish. As the rotating shaft rotates, the stirrer blades are arranged while gradually shifting the angle of the stirrer blades so that the agitator blades gradually interpose the slits toward the both ends of the combustion dish. The ash is moved while stirring from the center of the combustion dish in both directions.

  The ash removal means of the solid fuel combustion apparatus according to claim 3 is the ash removal means of the solid fuel combustion apparatus according to claim 1 or 2, wherein the arrangement of the stirring blades of the stirring shaft is stirred from both ends of the combustion dish. Arrange the stirrer blades while gradually shifting the stirrer blades so that the stirrer blades intervene in the slit and the stirrer blades gradually enter the slit toward the center of the combustion dish as the rotating shaft rotates. The solid fuel and the ash after combustion are moved from both ends of the combustion dish while stirring in the central direction.

  The ash removal means of the solid fuel combustion apparatus according to claim 4 is the solid fuel combustion apparatus according to claim 1, 2 or 3, wherein the slit of the combustion dish is a flat slit as a bottom surface thereof, and a side slit rising from the bottom surface. The stirring blade is configured to intervene a plane slit and one side slit, or a plane slit and two side slits by the rotation of the rotation shaft of the stirring shaft. .

  The ash removal means of the solid fuel combustion device according to claim 5 is the ash removal means of the solid fuel combustion device according to claim 1, 2, 3 or 4, wherein the stirring shaft is burned during ignition operation of the solid fuel combustion device. In the standby state other than the set operation time during the fire extinguishing operation or the fire extinguishing operation, the stirring blades of the respective stirring shafts do not intervene in the slits and are arranged at positions where the resistance of the combustion air passing through each slit does not become a resistance. It is characterized by waiting.

  The ash removal means of the solid fuel combustion apparatus according to claim 6 is the ash removal means of the solid fuel combustion apparatus according to claim 1, 2, 3, 4 or 5, wherein a heater is disposed adjacent to the side or bottom of the combustion dish. Then, the air passing through the vicinity of the heater is superheated, and a hole is arranged so that the heated air can be easily passed through a part of the slit or on one side of the combustion dish not provided with a slit. A solid fuel combustion apparatus equipped with an ignition device configured to ignite by supplying heated air to fuel, and at the time of ignition, each stirring blade passes through the vicinity of the ignition device without intervening in the slit. It is characterized in that it is placed in a position where it does not change the air volume and direction of the air and stands by.

  In the ash removal means in which a rotating shaft having a stirring blade is provided under the combustion dish and the stirring blade interposes the slit of the combustion dish, the stirring blade is a slit of the combustion dish when the ash removal means is on standby. Therefore, the fuel supplied to the combustion dish can be supplied without being affected by the position of the stirring blade. And since the stirring blade is cooled by the outside air that passes through it, it prevents deformation and deterioration due to combustion heat, improves the durability of the ash removal means, and does not require high heat resistance and high durability materials The cost of the ash removal device itself can be reduced, and since it is not waiting at the position where the stirring blade intervenes in the slit, the combustion air passing through the slit can burn the fuel uniformly without changing the wind direction or air volume. Can be done.

  Furthermore, since the stirring blade is arranged while gradually changing its angle in the left-right direction with the central portion as the base point, it is burned by rotating so that the central portion of the stirring blade intervenes first in the combustion dish. The solid ash that does not fall from the slit is gradually moved in the left-right direction while the ash at the center is dropped from the slit, and the combustion state at the center can be kept good.

  Then, by rotating the stirring blade in the direction opposite to the rotation direction and interposing the stirring blade in the combustion dish in the order from the outer direction to the central direction of the combustion dish, the solid fuel supplied to the entire combustion dish is moved in the central direction. Therefore, it is possible to ignite with a small amount of fuel supply. A lot of fuel is supplied so that it is easy to ignite at the time of normal ignition, so there is a tendency that the amount of fuel immediately after ignition is too large, but by using the present invention, a small amount of ignition and a small amount of combustion immediately after that are used. Is also possible.

  In addition, since each stirring blade passes through the slit with a time lag without intervening in the slit at the same time, it is not necessary to use a high-Turkish specification as the drive source for the stirring blade. A cost drive source (motor) is adopted, and the ash removal means with a simple structure and low cost can be proposed.

  As an embodiment of the present invention, a pellet stove using wood pellet fuel will be described below.

  FIG. 1 is a side sectional view of a pellet stove using wood pellet fuel as an example of a solid fuel combustion apparatus. FIG. 2 is a cross-sectional perspective view showing the ash removing means portion of the wood pellet stove. FIG. 3 is a partial perspective view of the stirring shaft of the ash removal means of the wood pellet stove. FIG. 4 is a diagram showing an arrangement state of the combustion dish and the stirring shaft, and FIG. 5 is a partial sectional view showing an arrangement relationship of the ignition device, the combustion dish and the stirring shaft.

  In FIG. 1, 1 is a wood pellet stove illustrating a solid fuel combustion apparatus. α is a wood pellet, and in the wood pellet stove 1, a combustion chamber 2 in which the wood pellet α is combusted and a heat exchanging portion 3 above from the middle portion are arranged. A combustion air exhaust port 7 is provided above the heat exchanging unit 3, and the combustion air is circulated to the exhaust air unit 6. A fuel tank 4 is provided adjacent to the combustion chamber 2, and fuel supply means 5 for supplying the wood pellet α from the fuel tank 4 to the combustion chamber 2 is disposed in close contact with the fuel tank 4. The fuel tank 4 shown in FIG. 1 has a space up to the upper end of the wood pellet stove 1, and the top surface of the wood pellet stove 1 serves as a door so that the wood pellet α can be put into the fuel tank 4. (Not shown).

  The lower end of the fuel tank 4 is inclined at the bottom toward the inlet of the fuel supply means 5 so that the wood pellet α can be introduced into the inlet of the screw conveyor 8 of the fuel supply means 5 without leakage. At the upper end of the screw conveyor, there are provided an input chute 9 for introducing the wood pellet α into the combustion chamber 2 and an air vent 10 serving as an outside air intake for allowing the outside air to flow into the input chute 9. The mouth 10 may be provided in the middle of the charging chute 9. The power of the screw conveyor 8 is obtained by the rotation of the motor 11.

  Between the combustion chamber 2 and the fuel tank 4, there is a cooling space 22 through which outside air flows, so that heat generated in the combustion chamber 2 is not transferred to the fuel tank 4 or the fuel supply means 5.

  Below the combustion chamber 2, there is a combustion section 12, in which a combustion dish 13 having a plurality of slits 23 in which the wood pellets α dropped from the charging chute 9 are deposited and burned is arranged. The rear surface of the combustion dish 13 is provided with a heater 14 in a long thin tube, and the air passing through the long thin is heated to a high temperature (about 250 ° C. or higher) by the heater 14 and the air is applied to the wood pellet α. An ignition device 15 having a structure for igniting is provided.

  The slit 23 of the combustion dish 13 is connected to the bottom and side of the combustion dish 13 in the front / rear direction or the left / right direction so that the wood pellet α is not dropped, and is provided in an elongated shape. Yes.

  Below the combustion dish 13, ash removal means 30 for removing solid ash that has floated or stuck on the combustion dish 13 is provided, and the ash after combustion that naturally falls from the combustion dish 13 The ash collection container 16 in which the ash that has been forcibly removed from the combustion dish 13 by the ash removal means 30 is accumulated is provided below the ash removal means 30 so as to cover the installation surface of the combustion dish 13.

  The heat exchanging section 3 that longitudinally cuts the combustion chamber 2 back and forth from the middle portion to the upper portion of the combustion chamber 2 is composed of a plurality of heat radiating pipes 17, and external air is forcibly supplied into the heat radiating pipes 17 by a pressure fan 18 to exchange heat. Then, warm air is supplied from the warm air outlet 19 to the outside of the apparatus.

  By the suction action of the suction fan 20 of the exhaust air unit 6, the combustion air in the combustion chamber 2 is sucked from the combustion air exhaust port 7, and the combustion air is exhausted from the exhaust duct 21 to the outside of the machine. In addition, a dust collector such as a cyclone is provided in the exhaust air unit 6 so as to prevent light ash having a specific gravity reaching the exhaust air unit 6 from being scattered on the combustion wind, and then passed through the dust collector. The configuration may be such that the combustion air is discharged from the exhaust duct 21 to the outside of the machine (not shown).

  By the operation of the suction fan 20, the outside air reaches the combustion chamber 2 through the slit 23 of the combustion unit 12 and the elongated cylinder of the ignition device 15 through the cooling space 22 or through the charging chute 9. The wood pellet α supplied from the fuel tank 4 via the screw conveyor 8 onto the combustion dish 13 of the combustion chamber 2 is ignited by the ignition device 15, receives ventilation from the slit 23, and the wood pellet α starts burning. To do. Thereafter, the combustion air is heat-exchanged in the heat exchanging unit 3, passes through the suction fan 20 from the combustion air exhaust port 7, and is discharged out of the machine from the exhaust duct 21.

  When the operation is started, the heater 14 is energized, and after energizing the specified time, it is determined that preheating is completed, the motor 11 is operated, and fuel is supplied onto the combustion dish 13. Then, after the set time has elapsed, the suction fan 20 is activated to supply a set amount of the wood pellet α onto the combustion dish 13. It is considered that combustion is detected when the temperature of the combustion air exhausted by the temperature sensor reaches the set temperature (40 ° C.), the pump fan 18 is operated, and the motor 11 is energized within the set interval and set time range. The combustion fuel is supplied periodically, and thereafter, if the temperature of the temperature sensor does not fall below the set temperature, it is determined that the combustion is stable, and the energization to the heater 14 is stopped.

  FIG. 2 is a view showing details of the combustion section 12 below the combustion chamber 2, wherein 24 is an inner wall of the combustion chamber 2, 25 is a rear wall of the combustion chamber 2, and 26 is a front wall (FIG. 1). A partition plate 27 for partitioning the installation space of the combustion chamber 2 and the ash collection container 16 is provided. A combustion box 28 is disposed in an opened portion of the partition plate 27, and the combustion dish 13 is dropped from the upper surface of the combustion box 28. It is included.

  The combustion dish 13 has a box shape with an upper surface consisting of a bottom surface, a left and right surface, and a front and rear surface, and is simply dropped into the upper surface opening of the combustion box 28. The combustion dish 13 and the combustion box 28 can be cleaned.

  The slit 23 of the combustion dish 13 is provided so as to be connected to the horizontal surface of the bottom surface and the front surface or rear surface of the surface rising from the bottom surface or both. And the ash removal means 30 is provided so that the inside of the combustion box 28 may be penetrated under the combustion dish 13 (FIG. 2).

  As shown in FIG. 3, the ash removing means 30 is formed of a rotating shaft 31 having a plurality of stirring blades 32, a motor 34 disposed at one end thereof, and a cam plate 35 at the other end ( Figure 2). The stirring shaft 33 is a position where the thin plate-like stirring blade 32 intervenes inside the combustion dish 13 without contacting the side surface of the slit 23 of the combustion dish 13, and the bottom surface of the combustion dish 13 and the rotary shaft 31 have a gap. The agitation shaft 33 is arranged so that all of the agitation blades 32 are accommodated in the combustion box 28. Further, the rotary shaft 31 penetrates the left and right inner walls 24 of the combustion chamber 2, and the motor 34 and the cam plate 35 are disposed outside the combustion chamber 2.

  As shown in FIG. 3, the stirring blades 32 arranged on the rotary shaft 31 gradually shift the installation angle of the adjacent stirring blades 32 in the sectional view of the rotary shaft 31, and all the stirring blades 32 are within 180 degrees. Has been placed.

  The number of the stirring blades 32 is the same as the number of the slits 23, the stirring blades a41 at both ends are arranged at the same angle in the sectional view of the rotating shaft 31, and the arrangement angle is gradually changed from both ends, and the stirring blade b42 at the center is the stirring blade It is fixed at a position at a rotation angle of 180 degrees from a41.

  A flat surface 36 is provided on a part of the outer peripheral surface of the cam plate 35 provided at one end of the stirring shaft 33. The sensor 37 for detecting the flat surface 36 can stop the stirring shaft 33 at a fixed location, and the stirring blade 32 does not intervene in the slit 23 of the combustion dish 13 as shown in FIGS. It is controlled to stop at.

  The motor 34 is capable of rotating in the left-right direction of the E direction rotation and the F direction rotation shown in FIGS. 2 and 4, and when rotating in the E direction, the stirring blade b <b> 42 is first placed in the slit 13 at the center of the combustion dish 13. The stirrer shaft 33 rotates in the direction in which the stirrer blades 32 on both sides gradually intervene in the slit 13, so that the wood pellets α and solid charcoal and ash in the combustor dish 13 are absorbed in the combustor dish 13. The position can be gradually moved in the direction from the center to both ends.

  Moreover, since each stirring blade sequentially intervenes in the slit 13 from the stirring blade a41 when rotated in the F direction, by continuing this rotation, the wood pellet α in the combustion dish 13 and the solid state charcoal and ash are removed. The position is gradually changed from the end side of the combustion dish to the center part.

  By the operation of the fuel supply means 5, the wood pellets α in the fuel tank 4 rises on the screw conveyor 8 and is supplied from the input chute 9 to the combustion dish 13 which is the combustion section 12 in the combustion chamber 2. The combustion supply means 5 is stopped by being supplied in a fixed amount into the combustion dish 13, but the wood pellets α supplied into the combustion dish 13 are dispersed throughout the combustion dish 13 from the impact of the fall. As shown in FIG. 2, the ignition device 15 is located in the center portion of the combustion dish 13, but in order to ignite the wood pellet α, it is necessary to fill the wood pellet α in a range that closes the ventilation hole 38 of the ignition device 15. Therefore, the amount of the wood pellet α that is naturally supplied into the combustion dish 13 becomes more than necessary, and the combustion amount may become larger than necessary immediately after ignition, which is a concern for safety. Therefore, the ash removal means 30 is operated while supplying the wood pellet α from the charging chute 9 into the combustion dish 13 or immediately after the supply, and the stirring shaft 33 is rotated in the direction of F, that is, from the stirring blades a41 at both ends, to the combustion dish 13. The wood pellet α supplied to both ends of the combustion dish 13 can be collected near the center of the combustion dish 13 to cover the vent hole 38 of the ignition device 15 by rotating so as to intervene in the slit 23. The wood pellet α is deposited on the top to enable ignition. Since the combustion fuel can be collected and ignited only in the vicinity of the ignition device 15, a small amount of combustion can be performed immediately after the combustion, and a quick adjustment to the desired amount of fuel and an improvement in safety are possible.

  Even during continuous combustion after ignition, if the stirring shaft 33 rotates periodically in the direction of intervening in the slit 23 from the stirring blade a41, that is, immediately after the ignition, that is, in the direction of F, it falls from the charging chute 9. However, since the combustion fuel supplied to the combustion dish 13 and spread over the entire area of the combustion dish due to the impact of dropping can be accumulated only in the central part, a combustion mode that enables combustion in an extremely small amount in the central part of the combustion dish. Can be created.

  Depending on the type of the wood pellet α supplied as the combustion fuel, there is an object that becomes solid after combustion and is difficult to fall from the slit 23. In particular, bark pellets formed from bark tend to become clinker after combustion and prevent combustion by staying in the combustion dish 13 and preventing the combustion air from passing through the slit 23, thereby burning the combustion fuel. Even if it is supplied to the tray 13, it may not be possible to maintain a combustion state commensurate with the supply amount, or smoke may be generated because uniform combustion cannot be performed in the combustion tray.

  In particular, a wood pellet stove places importance on the shape of the flame, and it is necessary to create a flame concentrated in the center. Therefore, it is not preferable that the flame repeatedly rises and disappears at various locations in the combustion dish.

  Therefore, if the stirring shaft 33 is configured to rotate periodically in the direction intervening from the stirring blade b42 into the slit 23, that is, the E direction, during continuous combustion, the clinker generated in the center of the combustion dish 13 and the solid after combustion Can be moved from the central portion of the combustion dish 13 to the left and right ends, the factor that blocks the slit 23 in the central portion of the combustion dish 13 is removed, and the air permeability of the slit 23 in the central portion is improved. By doing, the stable combustion of a center part can be enabled.

  The ash removal means 30 can detect the position of the agitation shaft 33 when the sensor 37 provided on the ash removal means 30 detects the flat surface 36 of the cam plate 35, so that the ash removal means 30 is not operating. 4 and 5, the agitating blades 32, 41, 42 stand by at a position where they do not intervene in the slit 23.

  As shown in FIG. 4 representing a normal combustion state in which the ash removal means 30 is not operating, since the stirring blades are not intervening in the respective slits of the combustion dish 13, the opening areas of the respective slits are constant, Since the air velocity and the air volume of the combustion air passing through each slit can be evenly performed, the combustion in the combustion dish can be performed uniformly. Further, the suction air heated by the heater 14 sucked through the vent hole 38 of the ignition device 15 shown in FIG. 5 is also ignited in a state where the stirring blades do not intervene each slit of the combustion dish. The heating air suitable for constant ignition can always be supplied from the vent hole 38 to the wood pellet α.

  Further, the stirring blades are not stopped at the combustion site, and are kept waiting while being cooled by the outside air 39 while taking a slight distance from the combustion dish 13, so that it is not always necessary to use a material that requires heat resistance. It is possible to configure the ash removal means 30 with a material that is cost-effective and easy to process, and a plurality of stirring blades do not intervene in the slit at the same time, and each gradually intervenes in the slit with a time difference, so that the wood pellets Because it comes in contact with the fuel, there is no need to receive resistance to block the rotation of the agitating blade at the same time, and it is necessary to select a driving source (motor) with high torque specifications, that is, high cost and high power consumption There is no.

  As described above, changing the direction of rotation of the stirring blades depending on the type and characteristics of the wood pellets α as combustion fuel, the method of charging into the combustion section, etc., for example, by rotating in the F direction at the time of ignition, The supplied fuel is collected in the center and ignited, and then rotated in the E direction immediately before the periodically injected fuel during continuous combustion is moved to quickly move the fixed ash in the center. Combustion that makes it possible to create a good flame efficiently by changing the rotation direction according to the characteristics of the fuel, such as rotating in the F direction so that the fuel gathers in the center immediately after the fuel is charged It is possible to provide an ash removal means for the apparatus.

  In a combustor that uses solid fuel, an exhaust removal device that includes a rotating blade provided with a stirring blade in order to quickly remove ash is installed in an arrangement in which the mounting position of the stirring blade and the rotating member is gradually changed. Thus, it is possible to provide an ash removing means that can be used as a device for moving the solid fuel or the fixed ash after combustion to a desired position while removing the ash.

It is side surface sectional drawing of the pellet stove using a wood pellet fuel. It is a cross-sectional perspective view which shows the ash removal means part of a wood pellet stove. It is a fragmentary perspective view of the stirring shaft of the ash removal means of a wood pellet stove. It is a figure which shows the arrangement | positioning state of a combustion dish and a stirring shaft. It is a fragmentary sectional view which shows the arrangement | positioning relationship of an ignition device, a combustion dish, and a stirring shaft.

DESCRIPTION OF SYMBOLS 1 Wood pellet stove 2 Combustion chamber 3 Heat exchange part 4 Fuel tank 5 Fuel supply means 6 Exhaust part 7 Combustion wind exhaust port 8 Screw conveyor 9 Input chute 10 Ventilation hole 11 Motor 12 Combustion part 13 Combustion dish 14 Heater 15 Ignition device 16 Ash recovery container 17 Radiation pipe 18 Pump fan 19 Hot air outlet 20 Suction fan 21 Exhaust duct 22 Cooling space 23 Slit 24 Inner wall 25 Rear wall 26 Front wall 27 Partition plate 28 Combustion box 30 Ash removing means 31 Rotating shaft 32 Stirring blade 33 Stirring shaft 34 Motor 35 Cam plate 36 Flat surface 37 Sensor 38 Ventilation hole 39 Outside air 41 Stirring blade a
42 Stirring blade b
α Wood pellet

Claims (6)

The solid fuel combustion apparatus has a plurality of slits arranged at predetermined intervals, a box-shaped or vessel-shaped combustion dish having an open upper surface on which solid fuel is deposited, a combustion chamber composed of a combustion space thereabove, and combustion after combustion An exhaust section for exhausting the combustion air from the chamber to the outside of the machine;
Combustion that stagnates in the combustion dish while stirring the solid fuel in the combustion dish through the slit of the combustion dish with the stirring blade of the stirring shaft consisting of the rotating shaft and a plurality of convex stirring blades on the outer peripheral surface of the rotating shaft. The ash removal means of the solid fuel combustion device configured to drop the ash after the fall from the slit,
The ash removal means of the solid fuel combustion apparatus, wherein the plurality of stirring blades of the stirring shaft are arranged within half a circumference of the rotating shaft by regularly changing the arrangement angle to the rotating shaft. The arrangement of the stirring blades of the stirring shaft is arranged in the slit from the center of the combustion dish, and the stirring blade is arranged so that the stirring blade gradually interposes the slit toward the both ends of the combustion dish as the rotating shaft rotates. Are arranged while gradually shifting
2. The ash removal means for a solid fuel combustion apparatus according to claim 1, wherein the solid fuel before or during combustion and the ash after combustion are moved while stirring from the center of the combustion dish in both directions. . The arrangement of the stirring blades of the stirring shaft is such that the stirring blades intervene in the slits from both ends of the combustion dish, and the stirring blades gradually enter the slits toward the center of the combustion dish as the rotating shaft rotates. Align the placement angle of the
2. The ash removal means of a solid fuel combustion apparatus according to claim 1, wherein the solid fuel before or during combustion and the ash after combustion are moved from both ends of the combustion dish while stirring in a central direction. The slit of the burning dish is connected to the plane slit that is the bottom surface and the side slit that rises from the bottom surface,
By rotating the rotating shaft of the stirring shaft, the stirring blade has a plane slit and one side slit,
The ash removal means for a solid fuel combustion apparatus according to claim 1, 2 or 3, wherein a flat slit and two side slits are interposed. During the ignition operation of the solid fuel combustion device, the stirring shaft is in a standby state other than the set operation time during combustion or fire extinguishing operation,
5. The apparatus according to claim 1, wherein the agitation blades of the respective agitation shafts are placed on standby without intervening in the slits and are not in resistance to the combustion air passing through the slits. The ash removal means of the solid fuel combustion apparatus of description. A heater is placed adjacent to the side or bottom of the combustion dish to overheat the air passing near the heater, and the heated air is easily passed from one slit to the other side of the combustion dish that does not have a slit. A solid fuel combustion device comprising an ignition device arranged to ignite by passing heated air through the solid fuel in the combustion dish,
At the time of ignition, each agitating blade is placed in a position where it does not change the air volume and the direction of the heated air passing through the vicinity of the ignition device without interposing in the slit, and stands by. The ash removal means of the solid fuel combustion apparatus according to 3, 4 or 5.

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