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US 8,020,547 B2Granted
Pellet stove
AssigneeClarry Pellet Stove, LLC
InventorsLarry Hepper, Carl Williamson
Life of this patent
Estimating the term…
Abstract
A pellet stove is disclosed comprising a reverse flow heated air pathway defined by stove sections. In an illustrated embodiment, the space between upper and lower stove sections is open to provide a heating or oven area. The stove can be readily disassembled in part for easy portability.
Claims26
A pellet stove comprising:
- a stove body comprising an elongated first stove body section with a first end portion and a second end portion, the first stove body section comprising an upper surface, a lower surface and first and second side surfaces;
- a portion of the first end portion of the first stove body section comprising a combustion chamber a pellet material inlet extending through the upper surface and positioned at an upper portion of the combustion chamber such that pellets to be burned travel downwardly under the influence of gravity through the pellet material inlet and into the combustion chamber;
- an apertured pellet supporting grate positioned in the combustion chamber to receive pellets delivered through the pellet material inlet, plural apertures of the pellet supporting grate being positioned such that a combustion air passageway extends upwardly through plural of said apertures to the combustion chamber;
- a combustion air inlet communicating with the combustion air passageway to deliver combustion air to the combustion air passageway and through the plural apertures of the pellet supporting grate to the combustion chamber upon opening the combustion air inlet, at least a portion of the combustion air being delivered so as to flow upwardly through plural apertures of the pellet supporting grate and into the combustion chamber;
- an air flow path comprising a first section comprising a first end portion communicating with the combustion chamber and a second end portion spaced from the combustion chamber and within the second end portion of the first stove body section, the second end portion comprising a first outlet portion and a second end adjacent to the second end portion, the first section extending in a first direction away from the combustion chamber toward the second end portion, a second upright section having a second inlet portion communicating with the first outlet portion, the second section also comprising a second outlet portion, the second section extending in a second upwardly extending direction away from the first section, a third section having a third inlet portion communicating with the second outlet portion, the third section comprising a third outlet portion, the third section extending in a third direction so as to be spaced from the first section and so as to at least partially overlie the first section, the first and third sections defining an at least partially open zone therebetween, and a fourth vent coupling section comprising a fourth vent inlet portion coupled to the third outlet portion, the fourth vent coupling section comprising a fourth vent outlet portion, wherein when the pellet stove is operated to burn pellets in the combustion chamber, heated air travels through the air flow path in succession from the combustion chamber, through the first section, the first outlet portion, the second inlet portion, the second section, the second outlet portion, a third inlet portion, the third section, the third outlet portion, the fourth vent inlet portion, the fourth vent coupling section, and the fourth outlet portion;
- a pellet guiding tube extending into the combustion chamber, the pellet guiding tube having a pellet guiding tube inlet communicating with the pellet material inlet and a pellet guiding tube outlet, the pellet guiding tube comprising an end portion that extends downwardly and inwardly into the combustion chamber from the pellet material inlet such that the end of the pellet guiding tube outlet is positioned in the combustion chamber at a location that is downwardly and inwardly in the first direction relative to the pellet material inlet and defining a pellet flow path from the pellet guiding tube inlet to the pellet guiding tube outlet that directs the travel of the pellets generally both downwardly and in the first direction toward the second end portion of the first section as the pellets travel from the pellet guiding tube inlet to the pellet guiding tube outlet;
- the pellet supporting grate comprising an apertured portion positioned below the pellet guiding tube and extending in the first direction beyond the pellet guiding tube outlet and toward the second end portion of the first section such that at least a plurality of apertures of the grate are positioned at locations spaced in the first direction from the pellet guiding tube outlet and nearer to the second end of the first section than the pellet guiding tube outlet to provide a path for the flow of at least some of the combustion air through plural apertures of the grate at locations nearer to the second end of the first section than the end of the pellet guiding tube outlet:
- and
- wherein the combustion air passageway is defined at least in part by an ash drawer receiving housing positioned below the pellet supporting grate with the combustion air inlet being at one end portion of the ash drawer receiving housing, and comprising an ash receiving drawer positioned beneath the pellet supporting grate when the ash receiving drawer is either inserted into the ash drawer receiving housing to a closed position or partially removed from the ash drawer receiving housing to partially open positions, the ash receiving drawer comprising an end portion sized to cover the combustion air inlet when the ash receiving drawer is in the closed position and to uncover the combustion air inlet to increase the access of combustion air through the combustion air inlet opening and upwardly into the combustion chamber as the ash receiving drawer is moved from the closed position to partially open positions or from one partially open position to a further open partially open position.
6 more elements
A pellet stove comprising:
- a first elongated section having a first longitudinal axis that is substantially horizontal when the pellet stove is in a use position, the first elongated section having first and second end portions, the first elongated section comprising a combustion chamber portion at the first end portion of the first elongated section and a first air flow conduit portion, the first air flow conduit portion comprising a first conduit end portion with an inlet communicating with the combustion chamber and a second conduit end portion at the second end portion of the first elongated section and spaced in a first direction from the combustion chamber;
- the combustion chamber portion comprising a pellet material receiving inlet adjacent to the first end through which pellets are delivered by gravity flow into the combustion chamber portion;
- a pellet flow guide positioned to direct pellet material from the pellet material inlet downwardly and forwardly in the first direction away from the pellet material receiving inlet;
- a pellet supporting grate positioned to receive pellets delivered to the combustion chamber portion;
- a combustion air flow passageway communicating with the combustion chamber for delivery of combustion air upwardly to pellets on the pellet supporting grate, with at least some of the combustion air being directed upwardly through the grate at locations positioned in the first direction from the pellet flow guide and from the pellet material inlet;
- an air flow conduit comprising at least the first conduit portion and a second conduit portion coupled to the first conduit portion and having an outlet, the first air flow conduit portion comprising a lower conduit portion and the second air flow conduit portion comprising an upper conduit portion, the upper conduit portion at least partially overlaying the lower conduit portion, the upper conduit portion being oriented to direct the air flow in a direction substantially opposite to the direction of air flow through the lower conduit portion such that the upper air flow conduit defines a flow reversing air flow conduit, and both the upper and lower air flow conduits including windowless exterior walls that are exposed to the ambient environment when the stove is in use;
- and
- wherein the combustion air flow passageway is defined at least in part by an ash drawer receiving housing positioned below the pellet supporting grate with the combustion air inlet being at one end portion of the ash drawer receiving housing, and comprising an ash receiving drawer positioned beneath the pellet supporting grate when the ash receiving drawer is either inserted into the ash drawer receiving housing to a closed position or partially removed from the ash drawer receiving housing to partially open positions, the ash receiving drawer comprising an end portion sized to close the combustion air inlet opening when the ash receiving drawer is in the closed position and to open the combustion air inlet to increase the access of combustion air through the combustion air inlet and upwardly into the combustion chamber as the ash receiving drawer is moved from the closed position to partially open positions or from one partially open position to a further open partially open position.
5 more elements
A pellet stove comprising:
- a first elongated tube section comprising an upper surface, a lower surface, first and second end portions, a first end adjacent to the first end portion, a second end adjacent to the second end portion, and a first longitudinal axis;
- a first end cap coupled to the first tube section and movable from a first position closing the first end of the first tube section to a second position at least partially opening the first end of the first tube section;
- plural legs detachably coupled to the first elongated tube section for supporting the first tube section with the first longitudinal axis in approximately a horizontal orientation;
- the first end portion comprising a combustion chamber, a pellet fuel inlet positioned in an upper surface of the first tube section and located at the first end portion, a pellet hopper having a lower pellet outlet connected to the pellet fuel inlet, a pellet fuel feed tube extending into the interior of the combustion chamber from the pellet fuel inlet, the portion of the fuel feed tube positioned in the interior of the combustion chamber being angled from the pellet fuel inlet in a direction downwardly from the pellet fuel inlet and away from the first end of the first tube section and toward the second end portion of the first tube section, the pellet fuel tube comprising a fuel tube inlet communicating with the pellet fuel inlet and a fuel tube outlet, the fuel tube outlet being positioned at a location that is at a distance in a first direction parallel to the longitudinal axis that is nearer to the second end than the distance in the first direction of the pellet fuel inlet to the second end;
- the first end portion comprising a combustion air inlet opening through the lower surface of the first elongated tube section and communicating with the combustion chamber;
- a pellet fuel supporting grate comprising an apertured portion overlying the combustion air inlet opening, the apertured portion comprising a plurality of apertures, the pellet fuel supporting grate being located to receive pellet fuel from the fuel feed tube so as to support a bed of pellet fuel for combustion on the fuel supporting grate with at least a portion of the combustion air flowing upwardly through the fuel supporting grate, the fuel supporting grate being insertable and removable through the first end upon opening the first end cap, at least a first plurality of the apertures of the apertured portion being positioned in the first direction nearer to the second end than the fuel tube outlet;
- an ash receiving drawer slidably coupled to the first tube section at a location below the access door, the ash receiving drawer comprising an upwardly facing ash receiving opening positioned beneath at least the apertured portion of the fuel supporting grate, the ash drawer comprising a portion of a combustion air flow passageway communicating from the exterior of the stove with the combustion air inlet opening, one portion of the combustion air flow passageway extending upwardly through the first plurality of the apertures positioned in the first direction nearer to the second end than the first tube inlet spaced from the fuel feed tube apertures, the ash drawer being slidable from a closed position in which the ash drawer covers the combustion flow passageway to partially open positions to provide additional access for combustion air through the combustion air flow passageway and wherein sliding the ash drawer from a first partially open position to a second partially open position that is more open than the first position increases the access for combustion air through the combustion air flow passageway, the ash receiving drawer being removable from the first tube section;
- an upright second tube section having a lower end portion coupled to the second end portion of the first tube section, the second tube section also comprising an upper end portion;
- an elongated third tube section having a first end portion coupled to the upper end portion of the second tube section, the third tube section having a second longitudinal axis, the third tube section overlying and being spaced from the first tube section and being shorter than the first tube section with a space between the first and third tube sections, the third tube section also comprising a second end portion with an outlet opening;
- and
- the space between the first tube section and third tube sections comprising an at least partially open heating zone.
8 more elements
Dependencies are inferred from the claim text.