Pellet stove

Abstract

The present invention is a downward combustion type pellet stove in which pellets from a hopper (10) are supplied downward to a combustor (30) in a combustion chamber (20) for combustion, and the combusted ash falls into an ash tray (40) at the bottom of the combustion chamber (20); The above combustion device (30) comprises a base body (32) made of a plurality of perforated plates (32a, 32b) spaced parallel to each other at a predetermined vertical interval, and a combustion frame (34) attached to the upper part of the base body (32), wherein the front and left and right sides are made of a metal mesh (34a) having a predetermined mesh, and the rear is made of a plurality of metal pillars (34b) spaced at a predetermined interval. The perforated holes (h) of the perforated plates (32a, 32b) of the base body (32) are arranged to be staggered vertically from each other. In the combustion frame (34), pellets are supplied from the hopper (10) into the combustion frame (34) through the open top to perform combustion, and the ash remaining after combustion falls to the lower ash tray (40) through the base body (32) made of perforated plates (32a, 32b) or passes through the spaced metal pillars (34b) at the rear of the combustion frame (34) along with the combustion heat. It is discharged to the rear of the combustion chamber (20).

Description

Technology Field

[0001] The present invention relates to a pellet stove used for winter heating, and more specifically, to a pellet stove used for concrete curing at construction sites, etc., in which the structure of the combustion chamber is improved and the airflow is induced three-dimensionally so that the combustion of pellets can continue for more than 18 hours, so that as the pellets dropped into the combustion chamber burn, the ash does not clump together and accumulate but crumbles and falls into an ash tray or is discharged to the outside through the chimney along with the fire. Background Technology

[0003] Generally, a pellet stove refers to a stove that uses wood pellets as fuel, which are processed by crushing forestry waste or felled wood into sawdust and then extruding it into a cylindrical shape. Regarding this, various prior art exists, including Patent Documents 1 to 5.

[0004] Meanwhile, conventional pellet stoves were designed to continuously supply pellets from a hopper containing pellets by using a separate electric device to continuously feed pellets into the combustion chamber, or by using a plate-shaped damper to adjust the cross-sectional area of ​​the discharge port at the bottom of the hopper. However, the method of controlling the amount of pellets supplied using an electric device had the problem of increasing the manufacturing cost of the pellet stove, as well as the problem of limitations on usage locations, additional electricity costs, and a high risk of breakdowns due to the use of electricity during the operation of the stove. In the method of controlling the amount of pellets discharged using a plate-shaped damper, it was discovered that a situation frequently occurred where the plate-shaped damper got stuck on the pellets because the discharge port at the bottom of the hopper was filled with pellets, making it difficult to control the opening. Furthermore, structural problems were found where soot or ash adhered thickly to the bottom surface of the plate-shaped damper due to the backflow of incomplete combustion gases, which also prevented proper control of the opening.

[0005] Meanwhile, conventional pellet stoves can continue to burn as the ash falls into the ash tray when the pellets are completely burned inside the combustion chamber. However, since air is mainly supplied only from the front of the combustion chamber, the incomplete combustion of the pellets causes ash to accumulate in the combustion chamber over time, which blocks the airflow and reduces the heat output. In severe cases, the fire goes out, causing the stove to stop functioning and resulting in a problem where the curing effect at the construction site cannot be achieved. Prior art literature

[0007] Korean Registered Patent No. 10-2291476 (Aug. 12, 2021) Korean Registered Patent No. 10-1729126 (April 17, 2017) Korean Registered Patent No. 10-1760201 (July 14, 2017) Korean Published Patent No. 10-2017-0081346 (July 12, 2017) The problem to be solved

[0008] The present invention was devised to solve the above-mentioned problems, and the objective of the present invention is to improve the pellet input amount control damper at the bottom of the hopper so that pellets can be stably fed into the combustion chamber, and to improve the structure of the combustion section so that pellets can be burned close to complete combustion, thereby preventing ash from clumping in an incomplete combustion state, so that continuous combustion is possible without the combustion chamber being blocked. means of solving the problem

[0010] To achieve the above objective, the present invention is a downward combustion type pellet stove in which pellets from a hopper are supplied downward to a combustion chamber to be burned, and the burned ash is recovered to an ash tray at the bottom of the combustion chamber; the combustion chamber comprises a bottom body made of a plurality of perforated plates spaced parallel to each other at a predetermined vertical interval, and a combustion frame attached to the top of the bottom body, which is surrounded by a metal mesh having a predetermined mesh on the front and left and right sides, and has a plurality of metal pillars spaced at a predetermined interval at the rear, wherein the perforated holes of the perforated plates in the bottom body are arranged to be staggered vertically from each other, and pellets from a hopper are supplied into the combustion frame through an open top to be burned, and the ash remaining after combustion falls to an ash tray at the bottom through the bottom body made of perforated plates or passes through the spaced metal pillars at the rear of the combustion frame along with the combustion heat and is discharged to the rear of the combustion chamber.

[0012] In another embodiment of the present invention, a pellet stove of the downward combustion type is provided, wherein pellets from a hopper are supplied downward to a combustor in a combustion chamber and combusted, and the combusted ash falls into an ash tray at the bottom of the combustion chamber; the combustor comprises a bottom body made of a plurality of perforated plates spaced parallel to each other at a predetermined vertical interval, and a combustion frame attached to the top of the bottom body, wherein a metal mesh having a predetermined mesh is wrapped around the front and left and right sides, and a plurality of metal pillars spaced at a predetermined interval are erected at the rear, wherein the perforated holes of the perforated plates in the bottom body are arranged to be staggered vertically from each other, and pellets from a hopper are supplied into the combustion frame through an open top to combust, and the ash remaining after combustion falls into an ash tray at the bottom through the bottom body or passes between the spaced metal pillars at the rear of the combustion frame along with the combustion heat and is discharged to the rear of the combustion chamber.

[0013] Preferably, the hopper is formed to be wider at the top and narrower at the bottom, and a damper is installed on the discharge side of the bottom to control the supply amount of pellets, wherein the damper is composed of a plurality of metal pins, and the supply amount of pellets can be controlled by adjusting the number of pins inserted into pin holes formed at regular intervals on the side of the discharge.

[0014] Preferably, the combustion chamber is formed as a tubular body including a square tube or a circular tube, and an opening is formed at the front of the combustion chamber for withdrawing or inserting the combustion frame, wherein the opening is formed obliquely, and a cover is placed over the opening with its upper end fixed by a hinge, and a front air inlet hole is formed in the cover for air to flow into the combustion chamber from the outside.

[0015] Additionally, the combustion chamber is formed with a hopper housing portion on the upper side where the combustion frame is located, to which the discharge port of the hopper is detachably connected, and an upper air inlet portion is formed on the outer edge of the hopper housing portion for the inflow of air into the combustion chamber from the outside.

[0016] In addition, the combustion chamber has a side air inlet formed on the side where the combustion frame is located to allow air to flow into the combustion chamber from the outside.

[0017] In the present invention, external air is introduced three-dimensionally into the combustion frame through the front air inlet, the upper air inlet, and the side air inlet. As a result, the pellets being combusted in the combustion frame undergo complete combustion without accumulating on one side or undergoing incomplete combustion due to the external air introduced three-dimensionally, and fall into the ash tray or are blown to the rear of the combustion chamber along with the combustion heat, thereby enabling continuous combustion for more than 18 hours.

[0018] In the present invention, the combustion chamber may be formed in various shapes, such as a straight line extending from the front to the rear, or an L-shape or C-shape extending from the rear to the side, and a chimney may be connected to the rear end of the combustion chamber so that the combustion heat in the combustion chamber can be sufficiently diffused into the room and then the combustion gas can be discharged to the outside. Effects of the invention

[0020] According to the present invention, pellets introduced into the combustion frame undergo complete combustion by air flowing in from the front, top, and sides, so that ash does not accumulate inside the combustion frame but falls into the ash tray at the bottom or is discharged to the outside through the combustion chamber at the rear of the combustion frame along with the combustion heat. This enables continuous combustion for more than 18 hours without any maintenance, so when used for general heating, it requires no cumbersome maintenance and is suitable for concrete curing at construction sites. Furthermore, the damper at the bottom of the hopper is made of a pin type rather than a conventional plate type, so the phenomenon of soot or ash sticking due to backflow of incomplete combustion gases does not occur, and the opening can be controlled, that is, the amount of pellets supplied, by adjusting the number of pins, thereby providing practical effects. Brief explanation of the drawing

[0022] FIG. 1 is a perspective view of a pellet stove according to a first embodiment of the present invention, FIG. 2 is a partially exploded perspective view of the pellet stove shown in FIG. 1, Figure 3 is an enlarged view of the damper section at the bottom of the hopper. FIG. 4 is an enlarged perspective view of the combustion device shown in FIG. 2, FIG. 5 is a plan view of the combustor shown in FIG. 2, FIG. 6 is a cross-sectional view along line A-A of FIG. 1, FIG. 7 is a cross-sectional view along line B-B of FIG. 1, FIG. 8 is a side cross-sectional view illustrating the combustion state of a pellet stove according to the first embodiment of the present invention, FIG. 9 is a photograph of a pellet stove according to a second embodiment of the present invention, FIG. 10 is a photograph of a combustion device according to another embodiment of the present invention. Specific details for implementing the invention

[0023] Hereinafter, preferred embodiments of the present invention that do not limit the invention will be described in detail with reference to the attached drawings.

[0024] FIGS. 1 to 8 illustrate a pellet stove according to a first embodiment of the present invention. The pellet stove (1) according to the present embodiment is a downward combustion type pellet stove in which pellets (P) from a hopper (10) are supplied downward to a combustor (30) in a combustion chamber (20) for combustion, and the combusted ash falls into an ash tray (40) at the bottom of the combustion chamber (20); The above combustion device (30) is composed of a bottom body (32) made of a plurality of perforated plates (32a, 32b) spaced parallel to each other at a predetermined interval in the upper and lower directions, and a combustion frame (34) attached to the upper part of the bottom body (32), with the front and left and right sides surrounded by a metal mesh (34a) having a predetermined mesh and the rear side having a plurality of metal pillars (34b) spaced at a predetermined interval. The perforated holes (h) of the perforated plates (32a, 32b) of the bottom body (32) are arranged to be staggered vertically from each other. The combustion frame (34) is designed so that pellets are supplied from the hopper (10) into the interior through the open upper part and combustion takes place, and the ash remaining after combustion falls through the bottom body (32) to the lower ash tray (40) or passes through the spaced metal pillars (34b) at the rear of the combustion frame (34) along with the combustion heat and is discharged to the rear of the combustion chamber (20).

[0025] In this embodiment, the metal pillar (34b) erected at the rear of the combustion frame (34) may be arranged in a straight line from left to right, but as shown in the drawing, it is more preferable to position the middle part toward the rear so that the ash remaining after the pellet is burned can be easily pushed backward while concentrated in the center of the combustion frame (34), and the height of the metal pillar (34b) is appropriately about half the height of the metal mesh (34a).

[0027] In this embodiment, the hopper (10) is formed to be wider at the top and narrower at the bottom, and a damper (14) for controlling the supply amount of pellets is installed on the side of the lower discharge port (12). The damper (14) is formed of a plurality of metal pins (14a) as shown in FIG. 3, and the amount of pellets discharged into the combustion chamber (20) can be controlled by controlling the degree of opening of the discharge port (12) by adjusting the number of pin holes (12a) formed at regular intervals on the side of the discharge port (12).

[0029] In the drawing, reference numeral 13 is an auxiliary bracket attached to the outside of the pin hole (12a), and a plurality of pin holes (13a) are formed in this auxiliary bracket (13) at positions corresponding to the pin hole (12a), so that a metal pin (14a) can be inserted straight into the outlet (12).

[0030] In this embodiment, the outer end of the metal pin (14a) is bent at a predetermined angle to make it easy to grip by hand. When the metal pin (14a) is inserted into the pin hole (12a) and gets caught on the dense pellets, the bent part of the outer end is held by hand, and the metal pin (14a) is rotated left and right while inserting, thereby pushing out the pellets (P) inside the outlet (12) and enabling easy insertion.

[0031] In this embodiment, the number of metal pins (14a) is 8 and the pin holes (12a) are also 8. The degree of opening of the discharge port (12) can be controlled by not inserting all 8 metal pins (14a) into each pin hole (12a), but by inserting one into each pin hole (12a) on both the left and right sides, or by inserting a total of 4 metal pins (14a) into each pin hole (12a) on both the left and right sides. This allows for appropriate control of the amount of pellets discharged to generate a desired amount of combustion heat. In this embodiment, even if incomplete combustion gas flows into the discharge port (12) of the hopper (10) due to a backflow phenomenon while the pellets are combusted in the combustion chamber (20), there is no concern that soot or dust will stick to the bottom surface of the plate-type damper as in the conventional method, so there is an advantage in that the amount of pellets fed using the damper (14) can be controlled without difficulty.

[0033] Meanwhile, the above-mentioned hopper (10) has a through hole (16) formed on the upper side, which is intended to prevent moisture inside the hopper (10) from condensing on the bottom surface of the lid (18). The reason for not forming a through hole in the lid (18) is to prevent the problem of moisture entering the hopper (10) and the pellets becoming damp even if water dripping from the ceiling of a construction site occurs.

[0035] In this embodiment, the combustion chamber (20) is manufactured by cutting a square tube to the required length, but the present invention is not limited thereto and can be manufactured in a square cross-sectional shape by bending or welding a metal plate, and can also be manufactured in a polygonal cross-sectional shape such as a hexagon instead of a square, or can be manufactured using a circular metal tube used for piping purposes.

[0037] In this embodiment, an opening (21) is formed in front of the combustion chamber (20) for drawing out or inserting the combustion device (30), and the opening (21) is formed at an angle so as to be inclined toward the front lower side, and a cover (23) is placed over the opening (21) with its upper part fixed to the combustion chamber (20) by a hinge (22), and a front air inlet hole (23a) is formed in the cover (23) for air to flow into the combustion chamber (20) from the outside.

[0038] The above-mentioned front air inlet (23a) is formed in the shape of a letter, number, or arrow by laser processing, but its shape is not limited to that shown in the drawing and can be manufactured in various ways, and it is also possible to adjust the degree of opening as needed.

[0039] The above cover (23) is designed to cover the inclined opening (21) by its own weight, and, if necessary, a locking mechanism may be installed to prevent the opening (21) from opening arbitrarily. In this embodiment, a locking mechanism (23b) made of a tension coil spring is attached to the bottom of the cover (23), and the other end of the locking mechanism is designed to be fixed by hooking it onto the leg side.

[0041] Additionally, the combustion chamber (20) is configured such that the hopper housing (24), to which the discharge port (12) of the hopper (10) is detachably coupled on the upper side where the combustion device (30) is located, is formed slightly larger than the discharge port (12) to allow for fitting installation, and an upper air inlet (25) for introducing air into the combustion chamber (20) from the outside is formed on the outer edge of the hopper housing (24).

[0042] The upper air inlet (25) is formed in a shape resembling a moat on all four sides of the hopper housing (24), and the width of the upper air inlet (25) on the front side of the combustion chamber (20), that is, on the side of the cover (23), is formed to be relatively narrower than the width of the upper air inlet (25) on the other three sides, that is, the left and right sides and the rear, so that the speed of the air entering from the front upper side of the combustion chamber (20) is faster than the speed of the air entering from other directions, thereby allowing the air introduced from the upper air inlet (25) to form an airflow from the combustor (30) inside the combustion chamber (20) to the rear.

[0043] In addition, the air introduced from the rear side of the upper air inlet (25) performs the function of pushing the ash remaining after combustion in the rear of the combustion frame (34) to the rear side of the combustion chamber (20), in addition to introducing air for combustion.

[0044] Additionally, an outwardly flared slanted wing (26) is formed on the left and right sides of the upper air inlet (25). This causes the cross-sectional area of ​​the upper air inlet (25) on the left and right sides to gradually decrease from top to bottom due to the slanted wing (26), thereby increasing the speed of the incoming air through the Bernoulli effect. This allows the outside air to be strongly introduced towards the left and right sides inside the combustor (30), so that the pellets are combusted on the left and right sides inside the combustor (30) and the remaining ash is blown downward and backward without accumulating.

[0045] In addition, the combustion chamber (20) has a side air inlet hole (27) formed on the side where the combustion frame (30) is located to allow air to flow into the combustion chamber (20) from the outside.

[0046] In this embodiment, the side air inlet (27) is cut in a V-shape and pressed inward so as to be opened toward the inner downward direction, but the present invention is not limited thereto, and the side air inlet (27) may be formed in various shapes, and the degree of opening may be adjusted as needed.

[0048] In addition, in the present invention, the bottom body (32) of the combustion device (30) is composed of two horizontally spaced perforated plates (32a, 32b), and since the front and rear of the bottom body (32) composed of two layers are open, outside air is introduced from the front of the combustion chamber (20) through the upper and lower perforated plates (32a, 32b) of the bottom body (32) and supplied from the lower part of the combustion frame (34), thereby allowing air for the combustion of the pellet (P) to be supplied three-dimensionally from the front, left and right sides, and up, as well as from the bottom, so complete combustion of the pellet can be made possible, and the function of pushing the pellet ash remaining in the combustion frame (34) to the rear can also be performed.

[0049] In other words, while conventional stoves operate on the principle of burning by dropping or removing ash, the present invention utilizes a certain amount of incompletely combusted ash to repeatedly burn it again, thereby reducing the volume of the finally completely combusted ash so that the pellets descend. This has the effect of maximizing calorific value, promoting complete combustion, and saving fuel, and allows for the complete combustion of the pellets due to differences in the amount of air inflow at each air intake location.

[0050] In addition, in the present invention, the ash tray (40) at the bottom where the combustion device (30) is located is spaced apart from the bottom of the combustion chamber (20) by a predetermined distance, thereby forming a gap space (g). Through this gap space (g), outside air is introduced from the bottom, allowing the pellets to be completely burned before falling into the ash tray (40).

[0052] In this embodiment, a flue (50) is installed at the rear of the combustion chamber (20) to allow combustion heat and combustion gas combusted in the combustor (30) to be finally discharged to the outside. The flue (50) is attached to a plurality of flue support legs (52) attached to the rear end of the combustion chamber (20), and the flue (50) is fixed with a fixing screw while inserted between the support legs (52).

[0054] In the drawing, reference numeral 28 is a bridge for supporting the combustion chamber (20), and reference numeral 29 is a viewing window formed on the side of the combustion chamber (20), allowing the flame state inside the combustion chamber (20) to be checked visually.

[0055] Also, the symbol S is a stopper made of a screw attached to the side of the combustion chamber (20) to ensure that the combustion device (30) installed inside the combustion chamber (20) is installed in the correct position.

[0057] In this embodiment, the pellets contained in the hopper (10) pass through the fin-shaped dampers and are supplied stably to the combustion frame (34) of the combustor (30) located inside the combustion chamber (20). Since external air is introduced three-dimensionally into the combustion frame (34) of the combustor (30) from the front air inlet (23a), the upper air inlet (25), and the side air inlet (27), the pellets (P) being combusted in the combustion frame (34) are completely combusted without accumulating on one side or undergoing incomplete combustion due to the external air introduced three-dimensionally, so that the ash does not accumulate above a certain height and falls into the ash catcher (40) or is blown to the rear of the combustion chamber (20) along with the combustion heat, thereby enabling continuous combustion for more than 18 hours.

[0059] In the present invention, the combustion chamber (20) is not limited to a straight shape, that is, a straight shape extending from the front to the rear as shown in the drawing, but can be formed in various shapes such as an L-shape or a C-shape extending from the rear to the side of the combustion chamber (20). Additionally, a chimney (50) is connected to the rear end of the combustion chamber (20) so that combustion heat passes through the combustion chamber (20) and is sufficiently diffused into the room, after which combustion gas can be finally discharged to the outside through the chimney (50). Fig. 9 shows a photograph of a pellet stove having a C-shaped combustion chamber (20) according to the second embodiment of the present invention.

[0060] In this embodiment as well, the remaining configuration is substantially the same as the first embodiment described above, except that the combustion chamber (20) is extended in a U-shape, so redundant descriptions will be omitted.

[0062] FIG. 10 is a photograph of a combustion device (30) according to another embodiment of the present invention. The combustion device (30) of this embodiment is intended to be used instead of the combustion device (30) applied to the pellet stove of the above-described embodiment. It comprises a base body (32) made of a plurality of perforated plates (32a, 32b) spaced parallel to each other at a predetermined upper and lower interval, and a combustion frame (34) attached to the upper part of the base body (32), with a metal mesh (34a) having a predetermined mesh surrounding the left and right sides, the rear open, and a perforated plate (33) rotatably installed on the upper part of the front. This allows for secondary adjustment of the pellet supply amount in the combustion frame (34) portion of the combustion device (30), that is, by adjusting the angle at which the rotatable perforated plate (33) is lifted inward into the combustion frame (34) using a separate support member (35), the amount of pellets flowing from the upper hopper into the combustion frame (34) and accumulating can be controlled. By doing so, the amount of combustion heat in the pellet stove can be appropriately controlled.

[0064] In this embodiment, the support member (35) can be adjusted to any angle by hooking it between the rotatable perforated plate (33) and the base body (32) like a forklift foot. Thus, when the user opens the cover (23) and supports it on an appropriate surface to achieve the desired angle, the amount of combustion can be adjusted to maintain the desired amount of heat.

[0065] In addition to the function of secondarily controlling the supply amount of pellets by the rotating perforated plate (33) according to the present embodiment, the rotating perforated plate (33) is positioned so that it slopes downward toward the rear side of the combustion device at a predetermined angle, thereby inducing the pellets to fall toward the direction in which the flame blows out of the combustion device, so as to resolve the accumulation of pellets, the pellets are supplied to a place where the heat of the flame is relatively high, and thus the effect of inducing complete combustion of the pellets is also achieved.

[0066] In addition, the combustion device (30) according to the present embodiment lowers the height at which ash formed by pellet combustion inside the combustion frame accumulates, thereby ensuring a smooth flow of air supplied to the combustion device from the outside, which enables a reduction in fuel quantity and an increase in heat quantity, and enables complete combustion of the pellets.

[0068] The foregoing description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope of the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are intended to explain, not limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by such embodiments. The scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention. Explanation of the symbols

[0070] 1 : Pellet stove 10 : Hopper 12: Outlet 12a: Pin hole 13: Auxiliary bracket 13a : Pin hole 14 : Damper 14a : Metal pin 16: Communion 18 : Lid 20: Combustion chamber 21 : Opening 22 : Hinge 23 : Cover 23a: Front air inlet 24: Hopper mounting area 25: Upper air inlet 26: Inclined wing 27: Side air inlet 28 : Legs 29 : View window 30: Combustion device 32 : Bottom 32a, 32b : Perforated plate 33 : Perforated board 33a : Hinge 34 : Combustion frame 34a : Metal mesh 34b : Metal column 35 : Jijigu 40 : Ash catcher 50 : Chimney 52 : Interlocking support angle g : gap space h : perforated hole P : Pellet S : Stopper

Claims

Claim 1 A downward combustion type pellet stove in which pellets from the hopper (10) are supplied downward to the combustor (30) of the combustion chamber (20) for combustion, and the combusted ash falls into the ash tray (40) at the bottom of the combustion chamber (20);The above combustion device (30) comprises a base body (32) made of a plurality of perforated plates (32a, 32b) spaced parallel to each other at a predetermined vertical interval, and a combustion frame (34) attached to the upper part of the base body (32), with a metal mesh (34a) having a predetermined mesh surrounding the front and left and right sides, and a plurality of metal pillars (34b) spaced at a predetermined interval erected at the rear. The perforated holes (h) of the perforated plates (32a, 32b) of the base body (32) are arranged to be staggered vertically from each other. In the combustion frame (34), pellets are supplied from the hopper (10) into the combustion frame (34) through the open top to perform combustion. The ash remaining after combustion falls through the base body (32) to the ash tray (40) at the bottom, or passes through the spaced metal pillars (34b) at the rear of the combustion frame (34) along with the combustion heat and is discharged to the rear of the combustion chamber (20). An opening (21) is formed at the front of the combustion chamber (20), and a cover (23) is placed over the opening (21), the upper part of which is fixed to the combustion chamber (20) by a hinge (22). A front air inlet hole (23a) for air inflow into the combustion chamber (20) from the outside is formed in the cover (23). The combustion chamber (20) has a hopper housing (24) formed on the upper side where the combustion device (30) is located, to which the discharge port (12) of the hopper (10) is detachably connected. An upper air inlet (25) for air inflow into the combustion chamber (20) from the outside is formed on the outer edge of the hopper housing (24). The upper air inlet (25) is formed on all four sides of the hopper housing (24), and the width of the upper air inlet (25) on the front side of the combustion chamber (20) is relatively compared to the width of the upper air inlet (25) on the remaining left and right sides and rear. A pellet stove characterized by being narrowly formed, with outwardly flared inclined wings (26) formed on the left and right sides of the upper air inlet (25), and the combustion chamber (20) having a side air inlet hole (27) formed on the side where the combustion frame (30) is located for air inflow into the combustion chamber (20) from the outside. Claim 2 delete Claim 3 A pellet stove according to claim 1, wherein the hopper (10) is formed to be wider at the top and narrower at the bottom, and a damper (14) for controlling the supply amount of pellets is installed on the side of the lower discharge port (12), wherein the damper (14) is formed of a plurality of metal pins (14a), and the degree of opening of the discharge port (12) can be controlled by adjusting the number of the plurality of metal pins (14a) inserted into pin holes (12a) formed at regular intervals on the side of the discharge port (12). Claim 4 delete Claim 5 delete

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