JP2013068401A - Pellet stove burning pot - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that it is impossible to efficiently burn wood pellets of all manufacturers through complete burning, due to a burning method in the conventional pellet stove having difficulties of: tendency of production of soot and tar in a pot after fuel burning, updraft peculiar demerit as the main demerit; unevenness of fuel burning on a fire grate; incompleteness in forming a flow of oxygen for promoting secondary or subsequent burning; and a wide range of existing standards of the wood pellets.SOLUTION: By installing a pot shield on a burning pot and making a fire grate in a two-stage structure, the merits of both the updraft and downdraft can be utilized to configure a pellet stove capable of evenly supplying oxygen necessary for burning, converting fuel into heat energy without waste, and ensuring high burning efficiency.

Description

  The present invention relates to a pellet stove with improved combustion performance.

  Since the conventional pellet stove has an updraft structure as shown in FIG. 1, the combustion efficiency is good and a large gas (cal) is obtained, but soot and tar are easily generated and complete combustion is difficult. Further, in the case of the downdraft structure FIG. 2, it is difficult for soot and tar to come out, but it is difficult to take out gas (cal).

  FIG. 3 shows an internal configuration of a conventional pellet stove. FIG. 3 is divided into a tank 11 for storing wood pellets 10 for fuel and a combustion chamber 31 for burning wood pellets. It drops into the combustion pot 30 through the shooter 13 from the supply parts 12a and 12b. The combustion pot receives the supplied wood pellets by a grate 21 provided therein and burns it with the above-mentioned updraft structure. An air hole 20 for performing secondary combustion is provided on the peripheral wall surrounding the grate.

  When the wood pellets burned on the upper surface of the grate 21 become smaller than the interval of the grate, the wood pellet falls to the ash tray 22 provided at the lower portion of the combustion pot and ends the combustion.

  As described above, there are advantages and disadvantages in the two types of combustion methods, updraft and downdraft, and it has been difficult to realize complete combustion.

  Since the pellet storage tank 11 has a low degree of sealing with room air, air 24 flows from the supply chute 13 when the combustion chamber 31 becomes negative pressure due to forced exhaust 15. Since the air 24 hits the flame 19, it seems that some secondary combustion is induced. However, since the mouth of the supply chute 13 is wide, the air spreads radially and the secondary burnup is low. Further, since air is discharged toward the front, a flame hits the glass surface 18 or the wall in the combustion chamber to form a soot and fog the glass surface, or the air is discharged as exhaust gas 25 to the outside as it is.

  The pellets burn on the grate 21, but the wood pellets on the market vary in material, size, and degree of compression. Pellets that have left calories (pellets that have not yet been burned) fall into the ash tray 22. Also, a mechanism for easily changing the grate spacing is difficult.

  The present invention solves such a conventional problem, achieves the advantages of both updraft and downdraft, and promotes more efficient combustion without waste of wood fuel. It is the target thing.

Means to solve the problem

  The invention according to claim 1 is characterized in that a pot shield (our name) FIG. 4 is installed on a combustion pot.

  In the invention according to claim 2, the grate in the combustion pot 40 in FIG. 5 has two upper and lower stages, the gap 45 of the lower grate 42 is narrower than the gap 44 of the upper grate 41, Furthermore, it arrange | positions so that the lower stage grate 42 may come just under the clearance gap 44 of the upper stage grate 41. FIG. A punching plate 43 having a plurality of holes is provided in the lower portion of the combustion pot.

Effect of the invention

  By installing the pot shield 50, it was possible to efficiently perform secondary combustion by concentrating the air 51 that has been discharged radially on the upper portion of the combustion pot into the combustion pot and supplying it in a pinpoint manner. At the same time, the flame 57 is less likely to hit the glass surface 58 and the wall surface of the combustion chamber, so that soot discharge is reduced. [Fig. 5]

  In accordance with the conventional updraft combustion 53, the air 51 from the supply chute produces a downdraft effect and can supply the necessary amount of oxygen by the flow of natural intake air. High pellet stove can be provided.

  Since the pot shield has a structure 56 that slightly narrows the hole through which the flame of the combustion pot passes, the air 52 and 54 from the bottom and the air 51 from the top collide with each other to form an air vortex 67 in the combustion pot. Thus, the entire wood pellet 60 on the grate 61 is promoted completely and uniformly.

  The wood pellet 66 that has been burned and reduced on the upper grate 61 falls and burns on the lower grate 62 until it becomes smaller. Further, as the combustion progresses and the wood pellet 63 that has become smaller falls, it falls on the punching plate 64 as ash 65 that has almost lost calories, and accumulates in the ash tray 68. As a result, it is possible to provide a pellet stove with high efficiency and high combustion that consumes fuel completely without waste.

  Diagram showing the form of an updraft   Diagram showing the form of downdraft   The figure which shows the form of the conventional pellet stove   Pot shield perspective view representing an embodiment of the present invention   Side sectional view of a grate representing an embodiment of the present invention   Air flow and fuel consumption chart in combustion pot by pot shield and grate of the present invention   1 is a perspective view of a grate representing an embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  The pot shield has an iron plate 70 installed at an angle at which the air 51 from the pellet supply chute floats in the combustion pot and an iron plate 71 that closes both sides of the iron plate 70 so that the flame and air from the combustion pot are slightly shielded and play. 72 is provided, and the iron plate 73 surrounds the lower side surface.

  The grate has an upper lattice 85 that first receives the wood pellets dropped from the supply chute and a lower lattice 86 that receives the wood pellets that have become smaller after combustion, and the lattices are arranged in a two-stage structure. Further, the interval between the lower gratings 86 is narrower than that of the upper grating 85, and each of the lower gratings 86 is arranged below the gap between the upper gratings 85. The grate is constructed by surrounding the upper and lower two-stage lattice 85.86 and the iron plates 80, 84, 83, 82 having the secondary combustion air holes 81 formed on the side surfaces.

  It is connected to a pipe that takes in air from the outside in a shape in which the side surface 4 installed in the combustion chamber is surrounded by an iron plate 40. The grate is fitted inside, and the pot shield is installed on the upper surface so that the pellet supply chute is closed. A punching plate is installed in the lower part inside the combustion pot. The combustion pot is configured as described above.

1, Combustion air 2, Intake pipe 3, Grate 4, Flame 5, Updraft 6, Downdraft 7, Combustion air 8, Exhaust pipe 9, Grate 10, Flame 11, Wood pellet storage tank 12a, Wood pellet Supply motor 12b, wood pellet supply auger 13, supply chute 14, blower fan motor 15, exhaust fan motor 16, exhaust pipe 17, intake pipe 18, front door glass 19, flame 20, secondary combustion air hole 21, grate 22, ash receiver 23, air outlet 24, air 25 from supply chute, exhaust 26, intake 30, combustion pot 31, updraft 40, combustion pot side wall 41, upper grate 42, lower grate 43, punching plate 44 , Upper grate gap 45, lower grate gap 50, pot shield A
51, air 52 from the supply chute, updraft 53 in the combustion pot, combustion air 54, updraft 55 in the combustion pot, air 56 that changes direction upon hitting the potshield, potshield B
57, flame 58, front glass 60, wood pellet 61, upper grate 62, lower grate 63, wood pellet 64 that almost lost calories, punching plate 65, ash 66, wood pellet 67 slightly reduced during combustion, Air vortex 68, ash receiver 70, pot shield part A occurring in the combustion pot
71, Pot Shield Parts B
72, Pot Shield Part C
73, Pot Shield Part D
80, grate side wall A
81, secondary combustion air hole 82, grate side wall B
83, grate side wall C
84, grate side wall D
85, upper grate 86, lower grate

Claims (2)

  A combustion pot characterized by a mechanism for promoting more efficient combustion with a more effective air (oxygen) supply method for pellet stove fuel and flame.   A combustion pot that features a mechanism for extracting more heat energy (complete combustion) from pellet stove fuel.

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