IE61593B1 - Solid fuel stove - Google Patents

Abstract

Four pour combustible solide comprenant un conduit d'air (5) pour recevoir l'air ambiant, chauffer l'air et amener l'air chauffé dans le parcours des résidus de combustion, une chicane (8) pour réduire la sortie (6) de la chambre de combustion (3) mais utilisable pour fair dévier les résidus de combustion par la sortie (6) lorsque la porte du four est ouverte et une chambre de combustion secondaire (9) dans le parcours d'écoulement des résidus.

Description

The present invention relates to solid fuel stoves.

Solid fuel stoves emit a mixture or hot air, solid particles and volatilised gases to the atmosphere. The latter two combustion residues contribute to environmental pollution.

It is an object of the present invention to provide a solid fuel stove in which the amount of environmental pollution emitted is reduced relative to that emitted by a traditional stove.

The present invention provides a solid fuel stove comprising: (a) a combustion chamber and a door for allowing access to said chamber, said combustion chamber including a primary combustion chamber having an outlet for smoke and solid fuel combustion residues and a secondary combustion chamber which is located downstream of said outlet; (b) combustion improvement means for heating ambient air and introducing the heated air into the flow path of the solid fuel combustion residues to enhance combustion of the residues; and (c) a baffle disposed between said primary and secondary combustion chambers, said baffle being movable between a first position, in which it restricts said outlet so that in use it restricts the outflow of the combustion residues and thereby enhances combustion thereof, and a second position in which said baffle diverts flow towards said outlet so that in use it deflects the combustion residues through said outlet, said baffle being connected to said door, whereby movement of said door results in corresponding movement of said baffle so that when said door is opened, said baffle is moved relative to said outlet so as to prevent the combustion residues escaping from the stove when the door is open.

Preferably, the combustion improvement means comprises air ducting which extends from an ambient air inlet, through a heating sone in the combustion chamber for heating the ambient air, to air outlets into the primary combustion chamber whereby combustion in said primary combustion chamber is enhanced by the provision of heated combustion air.

Advantageously, the air ducting includes outlets into said secondary combustion chamber for supplying heated air to the secondary combustion chamber- to enhance combustion of residues in that region.

Conveniently, the secondary combustion chamber is in thermal communication with the primary combustion chamber below and thermally insulated above so that in operation a high temperature, prevails.

The invention will now be described more particularly with reference to the accompanying drawings which show, by way of example only, one construction of stove according to the invention. In the drawings, Figure 1 is a perspective view of the stove; Figure 2 is a sectional side elevation of the stove; and Figure 3 is an enlarged view of a detail of Figure 2.

Referring to the drawings, and in particular to Figures 1 and 2, the stove comprises the usual conventional components such as a glass door 1 at the front thereof, a screw adjustable air inlet 2 above the glass door 1, a primary combustion chamber 3, and an outlet passageway 4 for combustion residues from the primary combustion chamber 3. The direction of flow of the hot air and residues within the stove is indicated by arrows.

To reduce the amount of pollution being emitted to the atmosphere it is desirable that the residues from the primary combustion chamber 3 should be subject to as much combustion as possible. The novel features provided, in the * stove to achieve additional combustion, and the operation of the stove, will now be described in more detail.

Hot air and combustion residues rise up to the upper region of the primary combustion chamber 3. A high temperature prevails in this upper region, because the upper region is directly above the fire. Furthermore, an air ducting system 5 is provided which includes an air inlet 5a for ambient air and air outlets 5b to the upper region. Air enters the inlet 5a, is superheated in ths air ducting system 5, rises up the air ducting system 5 by convective flow, and is emitted through the ports 5b into the upper region of the primary combustion zone. Introduction of this superheated air enhances combustion.

The hot air and combustion residues then flow out of the primary combustion chamber 3 through the restricted outlet δ defined by the fixed plate 7 and the baffle 8. Because of the restrictive nature of the outlet S the residues spend a longer time in the primary combustion chamber 3, thereby ·. further enhancing combustion.

J The air and combustion residues then enter a secondary s combustion chamber 9, shown on a larger scale in Figure 3.

* A high temperature prevails in this secondary combustion chamber 9 firstly because it is directly over the fire in the primary combustion chamber 3 and in thermal contact therewith, secondly because the secondary combustion chamber 9 is very well insulated above by ceramic wool lining 20, and thirdly because of the introduction of heated air from the ducting system through the nozzle 5b. Further combustion of the residues takes place in the secondary combustion chamber 9.

Finally the residues are exhausted to the atmosphere through 15 the flue 10, shown only in Figure 2.

To add extra fuel the glass door 1 is opened. As the glass door 1 opens the baffle 8 pivots downwardly so that when the glass door 1 is fully open the baffle 8 no longer restricts the outlet δ from the primary combustion chamber 3 but instead positively deflects combustion residues through the outlet δ. It will be seen that in this situation the baffle extends well below the level of the outlet 6. The purpose , of this arrangement is to prevent combustion residues escaping from the primary combustion chamber 3 into the room when, the glass door 1 is open.

In order to achieve efficient combustion, the stove is well insulated. The two side walls are each lined with a sheet of firebrick (not shown) extending the full height of the stove. Ceramic wool lining (not shown) is also provided between the firebrick and the sidewalls, extending from the bottom of the stove to half the height thereof.

A further desirable feature of the stove, from the point of view of cleanliness, is that air entering the stove through the adjustable air inlet 2 passes across the inside face of the glass door 1 and thereby keeps the inside face clean.

A still further desirable feature of the stove, also from the point of view of cleanliness, is that a shutter 14 is provided between the primary combustion chamber 3 and the ash tray 15 and ash box 16. The shutter 14 is opened from time to time to release accumulated ashes from the primary combustion chamber 3 into the ash tray 15 and ash box 16, and is then shut again. Ths ash tray 15 and ash box 16 are emptied by opening the ash pit door 17 and withdrawing the ash tray and ash box. The ash pit door 17 is opened, however, only when the shutter 14 is closed and the ashes have settled in the ash tray 15 and ash box 16. In this way there is less likelihood of loose ashes blowing about the room. The shutter 14 is operated by means of a lever (not shown) at one side of the stove.

The stove, including air ducting 5, is made of cast iron.

CLAIMS :

Claims (6)

1. f I

1. A solid fuel stove comprising: h (a) a combustion chamber and a door for allowing access to said chamber, said combustion chamber including a primary combustion chamber having an outlet for smoke and solid fuel combustion residues and a secondary combustion chamber which is located downstream of said outlet; (b) combustion improvement means for heating ambient air and introducing the heated air into the flow path of the solid fuel combustion residues to enhance combustion of the residues; and (c) a baffle disposed between said primary and secondary combustion chambers, said baffle being movable between a first position, in which it restricts said outlet so that in use it restricts the outflow of the combustion residues and thereby enhances combustion thereof, and a second position in which said baffle diverts flow towards said outlet so that in use it deflects the combustion residues through said outlet, said baffle being connected to said door, whereby movement of said door results in corresponding movement of said A baffle so that when said door is opened, said baffle is moved relative to said outlet so as to prevent the combustion residues escaping from the stove when the door is open.

2. A solid fuel stove according to Claim 1, in which the combustion improvement means comprises air ducting which extends from an ambient air inlet, through a heating zone in the combustion chamber for heating the ambient air, to air outlets into the primary combustion chamber whereby combustion in said primary combustion chamber is enhanced by the provision of heated combustion air.

3. A solid fuel stove according to Claim 2, in. which the air ducting includes outlets into said secondary combustion chamber for supplying heated air to the secondary combustion chamber to enhance combustion of residues in that region.

4. A solid fuel stove according to any preceding claim in which the secondary combustion chamber is in thermal communication with the primary combustion chamber below and thermally insulated above so that in operation a high temperature prevails.

5. A solid fuel stove substantially as herein described with reference to and as shown in the accompanying drawings. MACLACHLAN & DONALDSON, Applicants’ Agents, 47 Merrion Square, DUBLIN 2. WATERFORD FOUNDRY (INVENTIONS) LIMITED 61 593 THREE SHEETS SHEET ONE If- Hb MACLACHLAN & DONALDSON ,Μ· MACLACHLAN & DONALDSON 'V ’AZj» ,,

6. 'i '93 TjyR®·· 0% f