IE890314L

IE890314L - Heat ambient air for combustion in solid fuel stove having¹transparent front panel

Info

Publication number: IE890314L
Application number: IE890314A
Authority: IE
Inventors: James Corcoran; Michael Stack
Original assignee: Waterford Foundry Inv S Ltd
Priority date: 1989-02-01
Filing date: 1989-02-01
Publication date: 1990-08-01
Also published as: CA2008980A1; CA2008980C; IE63149B1; BE1000960A7

Abstract

STOVE A solid fuel stove including an air ducting system for receiving ambient air, heating the air, and distributing the heated air across the inside face of the transparent stove door to enhance combustion in this region and thereby prevent any build up of residues on the inside face. [CA2008980C]

Description

P4594.IE 6 314 9 3i^/ec7 STOVE * The present invention relates to solid fuel stoves of the type having a transparent panel through which a fire in the *■ 5 stove may be viewed.

One disadvantage with solid fuel stoves of the type described is that combustion residues have a tendency to build up on the inside face of the transparent panel.

Regular cleaning of the inside face is necessary if the fire is to be seen properly. This regular cleaning involves opening the stove door and wiping the residues, with the consequent risk of residues entering the room in which the stove is located. Residues may also enter the room when the 15 stove door is opened to add fuel.

An object of the present invention is to provide a stove which causes less atmospheric and also less indoor pollution than a traditional stove and which requires less or no 20 cleaning of the inside face of the transparent panel.

The present invention provides a solid fuel stove comprising a combustion chamber and a door for providing access to said chamber, said door having: i 6 314 9 (a) a transparent panel through which a fire in said combustion chamber may be viewed; (b) a primary air inlet through which air may be introduced into the combustion chamber for fueling combustion; (c) an air duct located about the transparent panel, the duct having a plurality of air outlets provided at the rear face of the transparent panel; and (d) a secondary air inlet through which air is introduced into said air duct, whereby air entering said air duct is heated by thermal communication with said combustion chamber and the heated air is distributed about the rear face of said transparent panel to enhance combustion in the region adjacent the rear 15 face and thereby prevent build-up of residues on the rear face.

Preferably, the stove includes an air intake regulator located over the primary air inlet and the secondary air 20 inlet and operable to control the air intake to both air inlets so that the supply of air to the rear face of said transparent panel is proportional to the supply of air to the combustion chamber to ensure that the rear face is kept • clean regardless of the amount of combustion taking place.

Advantageously, the proportion of air flowing to the combustion chamber and flowing to the duct is 2/3 and 1/3 of the total inflow respectively.

Preferably, the stove includes an adjustable air inlet at the rear thereof whereby when the air intake regulator in the door of the stove is at a low setting the air inlet at the rear of the stove may be opened so that slow combustion takes place throughout the stove.

Advantageously, the combustion chamber has a restricted outlet to ensure further combustion of residues before release to the atmosphere.

The invention will now be described more particularly with reference to the accompanying drawings which show, by waiy of example only, one construction of a stove in accordance with the invention. The direction of air flow is indicated by arrows. In the drawings: Fig. 1 is a perspective view of the stove; Fig. 2 is a sectional side elevation of the stove; and 25 Fig. 3 is a perspective partially cut away view of the stove door.

Referring initially to Fig. 1, the drawing shows a base 1, support legs 2, a front door 3, a glass panel 4, a door handle 5, an air flow adjustment mechanism 6, a top 7, a hob 8, a flue outlet 9, and a side wall 10. Referring now to both Figs. 2 and 3, when the air flow adjustment mechanism 6 is opened, air enters around the sides of the mechanism. A portion of the air, as indicated by full arrows, flows through a first air inlet 11 to the primary combustion chamber 12. The remaining portion of the air, as indicated by dashed arrows, flows through a second air inlet 13 into air ducting which is defined between the front wall 3a, rear wall 3b, outer side wall 3c and inside wall 3d of the door 3, and which extends circumferentially around the edge of the glass panel 4. As this remaining portion of the air flows through the ducting it is warmed. The warmed air exits from the ducting through a series of small air ports 14, and flows across the inside face of the glass panel 4. This flow of warmed air across the inside face of the glass panel 4 ensures that combustion takes place in this region thereby preventing any build up of combustion residues on the inside face. As a result it is not necessary to clean the inside face of the glass panel 4, an operation which would ordinarily involve the risk of ash or other residues being introduced into the room in which the stove is located. The air divides in a ratio of 2/3 to the primary combustion chamber and 1/3 to the ducting system, and this ratio is constant regardless of the volume of the airflow. * Reference is again made to Fig. 2 and in particular to the inflow of additional air to the rear of the stove. To reduce atmospheric pollution it is desirable that efficient combustion take place during all modes of use. In traditional stoves a difficulty arises in relation to the 10 slowing burning mode, in that adequate combustion takes place only at the front of the stove. In order to overcome this problem a small adjustable air inlet 15 is provided at the rear of the stove. When the air flow adjustment mechanism 6 at the front of the stove is almost closed in 15 the slow burning mode, the air inlet 15 at the rear may be opened. This ensures a small even flow of air throughout the stove. The air inlet 15 is opened and closed by the movement of a pivoted arm 30. The arm 30 is operated by-means of a lever 31 which extends towards the front of the 20 stove finishing with a handle 31a concealed from view just below the projecting lip 1a of the base 1. Air is drawn into the air inlet 15 both from behind the stove and also from in front of the stove along ducting 32 immediately beneath the base 1.

Reference is now made to Fig. 2, and in particular to the outflow of hot gases and combustion residues to the $ atmosphere. To reduce atmospheric pollution, an arrangement • is provided which comprises a canopy or roof 16 projecting over part of the combustion chamber 12 so that an outlet passage 17 is defined between the upper surface of the canopy 16 and the lower surface of the top 7 of the stove, and between a first perforated baffle 18 and a second perforated baffle 19 in the passage 20. The effect of the 10 baffles 18 and 19 is to restrict the passage 20 and thus slow down the outflow, ensuring better combustion of the residues. Furthermore, in flowing along the passage 20 the residues pass above the fire in the combustion chamber 12, further enhancing combustion. The first baffle 18 is 15 mechanically connected to the door 3 so as to open and close as the door 3 opens and closes. The purpose of this mechanical connection (not shown) is to allow a freer flow of hot air and combustion residues along the passage 20 when the door 3 is open, so as to avoid the residues flowing out 20 through the open door into the room. «

Claims

CLAIMS:

1. A solid fuel stove comprising a combustion chamber and door for providing access to said chamber, said door having (a) a transparent panel through which a fire in said combustion chamber may be viewed; (b) a primary air inlet through which air may be introduced into the combustion chamber for fueling combustion; (c) an air duct located about the transparent panel, the duct having a plurality of air outlets provided at the rear face of the transparent panel; and (d) a secondary air inlet through which air is introduced into said air duct, whereby air entering said air duct is heated by thermal communication with said combustion chamber and the heated air is distributed about the rear face of said transparent panel to enhance combustion in the region adjacent the rear face and thereby prevent build-up of residues on the rear face.

2. A solid fuel stove according to claim 1, including an air intake regulator located over the primary air inlet and the secondary air inlet and operable to control the air - 8 - intake to both air inlets so that the supply of air to the rear face of said transparent panel is proportional to the supply of air to the combustion chamber to ensure that the rear face is kept clean regardless of the amount of combustion taking place.

3. A solid fuel stove according to claim 2, wherein the proportion of air flowing to the combustion chamber and flowing to the duct is 2/3 and 1/3 of the total inflow 10 respectively.

4. A solid fuel stove according to any preceding claim including an adjustable air inlet at the rear thereof whereby when the air intake regulator in the door of the 15 stove is at a low setting the air inlet at the rear of the stove may be opened so that slow combustion takes place throughout the stove.

5. A solid fuel stove according to any preceding claim 20 wherein the combustion chamber has a restricted outlet to ensure further combustion of residues before release to the atmosphere.

6. A solid fuel stove substantially as herein described 25 with reference to and as shown in any of the accompanying drawings. MACLACHLAN & DONALDSON, Applicants' Agents, 47 Merrion Square, DUBLIN 2. I 5