GB2504659A

GB2504659A - Heating appliance

Info

Publication number: GB2504659A
Application number: GB201210878A
Authority: GB
Inventors: Nigel True
Original assignee: CHESNEY S Ltd
Current assignee: CHESNEY S Ltd
Priority date: 2012-06-20
Filing date: 2012-06-20
Publication date: 2014-02-12
Anticipated expiration: 2032-06-20
Also published as: GB2504659B; GB201210878D0

Abstract

A heating appliance 1 has a fire-box 3 with an opening 4 for placing combustible fuel 26 inside the fire-box 3, and a fire door 6 for closing the opening 4. An air supply means for the heating appliance 1 includes vents 20 situated below the opening 4 for supplying air to the opening 4 when the fire door 6 is opened from a closed position in order to at least partially block emissions from the fuel 26 from leaving the fire-box 3 via the opening. The fire door 6 is arranged to close the vents 20 when the fire door 6 is in the closed position.

Description

HEATING APPLIANCE

The present invention relates to a heating appliance, and particularly a solid fuel heating appliance such as a stove.

A heating appliance in the form of a wood-burning stove has an opening sealed by a fire door. When wood in the stove combusts, it emits carbon monoxide (CO) emissions of typically 21 parts per million and carbon dioxide (C02) emissions of typically 450 parts per million through the opening when the door is opened to refuel the stove. However, there is a problem in that these stove emissions should be prevented from leaving the stove through the opening. This is particularly the case in a well-sealed building, such as a new build house, having such a stove, where the building is sealed with less than 5 cubic metres of air permeability.

It is an object of the present invention to provide a heating application to alleviate the above-mentioned problem.

According to the present invention there is provided a heating appliance comprising a fire-box with an opening for placing combustible fuel inside the fire-box; a fire door for closing the opening; and air supply means including vent means situated below the opening for supplying air to the opening when the fire door is opened from a closed position in order to at least partially block emissions from the fuel from leaving the fire-box via the opening, the fire door arranged to close the vent means when the fire door is in the closed position.

The fire door may be arranged to seal the vent means when the fire door is in the closed position.

The vent means is preferably arranged to supply a curtain of air from a bottom of the fire-box opening.

The air supply means may have an air inlet through which an external supply of air is received. The air supply means may include at least one combustion air conduit for supplying air to the inside of the fire-box for providing air for combusting the fuel. Both the vent means and the at least one combustion air conduit may be connected to the air inlet.

The heating appliance may include control valve means for controlling flow of air in the at least one combustion air conduit. The control valve means may be located downstream of the air inlet and downstream of an entrance to the vent means.

An embodiment of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a front view of a heating appliance according to the invention mounted on a mount; Figure 2 is an isometric sectional view taken along lines X-X of Figure 1; Figure 3 is a bottom perspective view of a fire box and manifold of the heating appliance; Figure 4 is a schematic bottom perspective view of an air control valve for the heating appliance; and Figures 5 and 6 are schematic sectional views of the heating appliance with a fire door of the fire-box being in a closed and an open position, respectively.

Referring to Figures 1 to 4 of the accompanying drawings, a solid fuel heating appliance or stove 1 is mounted on a mounting 2. The stove 1 has a fire-box 3 with an opening 4 at its front for placing combustible solid fuel inside a chamber 5 of the fire-box 3, and a fire door 6 for closing the opening 4. At the top of the fire-box 3 is a flue 7, and baffles 8 are located beneath the flue 7.

The fire-box 3 has, beneath the chamber 5, a primary air flow chamber 9 and a secondary air flow chamber 10, the secondary air flow chamber 10 being in front of the primary air flow chamber 9. A manifold or entry chamber 11 is screwed to the underside of the fire-box 3 (see Figure 3) beneath the primary and secondary air flow chambers 9, 10, and the manifold 11 has an air inlet 12 at its base. The underside of the fire-box 3 has a first opening or inlet 13 into the primary air flow chamber 9 and a second opening or inlet 13' into the secondary air flow chamber 10. A disc 14 mounted on the underside of the fire-box 3 has two openings 15, 16 for controlling flow of air to the respective inlets 13, 13' to the primary and secondary air flow chambers 9, 10. The disc 14 is rotated by a connected control rod 17 that extends through an opening in a wall 18 at the front of the manifold 11. A flange 19 extends from the front wall 18 of the manifold 11 towards the front of the stove 1 and the front wall 18 has vents above the flange 19. When the fire door 6 is in a closed position, the bottom 21 of the door 6 is adjacent the top of the flange 19 and closes or seals the vents 20 (see Figure 5).

The primary air flow chamber 9 has a passageway or conduit 22 behind a rear wall 23 of the fire-box chamber 5 and the rear wall 23 has openings 24 for allowing air flow from the conduit 22 to the fire-box chamber 5.

The secondary air flow chamber 10 is connected by conduits (not shown) on either side of the fire-box chamber 5 to a secondary air flow vent 25 at the top of the opening 4.

The manifold 11 with its air inlet 12 and vents 20, and the primary and secondary air flow chambers 9, 10 with their conduits 22 and vent 25 form an air supply means.

Referring to Figure 5, when the stove 1 is in use, wood 26, or other solid fuel, is burnt inside the fire-box chamber 5 and the fire door 6 is in a closed position, sealing the manifold vents 20. A primary flow of air A is supplied to the fire-box chamber 5 via the air inlet 12, the primary air flow chamber 9 and its conduit 22 at the rear of the fire-box chamber 5 to enable the wood 26 to burn or combust. Emissions B from the burning wood 26, including CO, CO2 and smoke, leave the fire-box chamber 5 via the flue 7. A secondary flow of air C is supplied to the top of the fire-box chamber 5 from the air inlet 12 via the secondary air flow chamber 10 and vent 25 and the secondary tlow of air C is used prevent soot building up on a window 27 in the fire-box door 6.

The control rod 17 is used to rotate the disc 14 in order to control the flow of air from the air inlet 12 into the primary and secondary air flow chambers 9, 10 wherein the disc 14 acts as a valve. When the control rod 17 is pulled out to its maximum extent, the inlets 13, 13' (see Figure 4) into the primary and secondary air flow chambers 9, 10 are opened to their maximum extent by the disc 14. When the control rod 17 is pulled out to a halt-way position, the primary air flow inlet 13 is closed or shut off by the disc 14 and the secondary air flow inlet 13' is open. When the control rod 17 is pushed fully in, a slight bleed ot primary air is let into the fire-box chamber 5.

Referring to Figure 6, when the stove 1 needs to be refuelled, the fire door 6 is opened unsealing the manifold vents 20. Air from the air inlet 12 takes the path of least resistance and flows through the manifold vents 20 and not into the primary and/or secondary air flow chambers 9, 10, regardless of the position of the disc 14. Air D from the manifold vents 20 flows up into the fire-box opening 4 before it is drawn into the tire-box chamber 5 and subsequently into the flue 7. These manifold vents 20 thus supply a curtain ot air D from a bottom of the tire-box opening 4 and the curtain of air tlows over the opening 4 to prevent emissions B from leaving the fire-box chamber 5 via the opening 4.

In a specitic example ot a preferred embodiment, the air inlet 12 is 80 mm in diameter.

Whilst a particular embodiment has been described, it will be understood that various modifications may be made without departing from the scope of the invention.

Claims

CLAIMS: 1. A heating appliance comprising: a fire-box with an opening for placing combustible fuel inside the fire-box; a fire door for closing the opening; and air supply means including vent means situated below the opening for supplying air to the opening when the fire door is opened from a closed position in order to at least partially block emissions from the fuel from leaving the fire-box via the opening, the fire door arranged to close the vent means when the fire door is in the closed position.
2. The heating appliance as claimed in claim 1, wherein the fire door is C) arranged to seal the vent means when the fire door is in the closed position.

(0 15
3. The heating appliance as claimed in claim 1 or 2, wherein the vent means 0 is arranged to supply a curtain of air from a bottom of the fire-box opening. r
4. The heating appliance as claimed in claim 1, 2 or 3, wherein the air supply means has an air inlet through which air is received.
5. The heating appliance as claimed in any preceding claim, wherein the air supply means includes at least one combustion air conduit for supplying air to the inside of the fire-box for providing air for combusting the fuel.
6. The heating appliance as claimed in claims 4 and 5, wherein the both the vent means and the at least one combustion air conduit are connected to the air inlet.
7. The heating appliance as claimed in claim 5 or 6, including control valve means for controlling flow of air in the at least one combustion air conduit,
8. The heating appliance as claimed in claims 6 and 7, wherein the control valve means is located downstream of the air inlet and downstream of an entrance to the vent means. C') (0 Co r