GB2177490A - Heating air in fuel-effect gas fires - Google Patents

Abstract

A gas fire, to fit as a liner in a domestic fire place, has a double-walled casing (1, 2), providing a passage for upward flow of air past a heat-exchanger (13) for convection heating, and a front recess (14) in which a gas burner box (9) is surmounted by a refractory plaque (17) for surface combustion of gas to give a real-fire effect over artificial fuel (19). <IMAGE>

Description

SPECIFICATION Gas fire for space heating This invention relates to gas fires for space heating and, in its preferred embodiment, provides an openfronted, living-flame gas fire unitto fit into a standard domestic fire-place, usually of a width 16 or 18 inches (408 or 460 mm).

According to the invention there is provided a gas fire having an open-fronted, double-walled casing,to fit as a fire-back liner in a domesticfire-place and presenting a front recess, the space within the double walls of the casing providing a heat-exchange pas sage for upward flowofair, between a lowerinletand an upper outlet, for convection heating, and a gas burner box mounted in the lower part of the front recess ofthe casing and presenting a refractory pla queforsurfacecombustion of gas.

Otherfeatures ofthe invention are set out in the appended claims.

A preferred embodiment is described, by way of example, with reference to the accompanying drawing, in which Figure lisa front elevation of a gas fire, with a surround indicated in broken lines and omitting a fender or decorative basket front or cover as usually provided, and Figure 2 is a sectional side elevation, on the line ll-ll of Figure 1, showing the surround in full lines and the adjacent parts of a domestic fire-place.

As shown by the drawing, the gas fire comprises a double-wall metal casing, having a back wall 1 and a front wall 2, which fits as a fire-back liner in a standard domestic fire-place.

The back wall 1 rises from a horizontai base3and, with a lower angled part4ofthefrontwall 2which supports a burner box mounting plate5,formsa lower portion 6 of the space between the casing walls.

This space portion 6 is of substantially right-angled triangular shape in cross-section (fore-and-aft) and, optionally, houses an electrically driven aircirculating fan 7.

From the space portion 6, which air can enter rover the hearth as indicated by the arrow A in Figure 2, extends an upwardly and forwardly inclined air passage 8, behind and sloping upwardly from a burner box 9 mounted on the plate 5 and provided with the usual gas and air inlets and controls as generally indicated at 10 in Figure 1.

An upper portion 11 of the space between thewalls 1 and 2 has a front outlet 12forwarm air, as indicated by the arrow B, and is spanned buy a nest of heatexchange flue tubes 13 which lead combustion gases from the front recess 14 of the casing to a flue gas vent grill 15 opening forfiue gasesto exhaust intothe domesticflue 16. The heat exchange nestoftubes 13 promotesturbulentflowof air round thetubes through the upperwall space 11.

The burner box 9 has a porous refractory plaque 17, or plaques, at the upper surface of which gas combustion occurs, as is known.

The plaque 17 is surmounted by a refractoryfire bed 18 on which are arranged artificial fuel pieces 19, such as coal knobs or logs, between which gas flames can penetrate to give a real-fire effect.

The front casing wall 2 may have a stainless steel or other reflector and the casing passage may have a thermal insulating lining 20.

Asurround 21, of a size to suit a standardfire-place opening, is provided to fit over the front of the fire casing and close, around the fire-place opening, over and around a casing front plate 22 of the gas fire casing.

1. Agasfire having an open-fronted,double- walled casing, to fit as a fire-back liner in a domestic fire-place and presenting a front recess, the space within the double walls of the casing providing a heat-exchange passage for upward flow fair, between a lower inlet and an upper outlet, forconvec- tion heating, and a gas burner box mounted in the lower part ofthe front recess ofthe casing and presenting a refractory plaqueforsurface combustion of gas.

2. A gas fire according to claim 1, in which the space between the doublewalls of the casing comprises a lower portion, beneath and behind the burner box and of substantially right-angled trianguiar cross-sectional shape, an upwardly and forwardly incoined air passage, behind and sloping upwardly from the burner box, and an upper portion having a front warm airoutletand spanned by heat-exchangeflue means leading from the upper part of the front recess to a flue gas ventto exhaust two a domesticflue.

3. A gas fire according to claim 2, in which an electrically-driven air-circulating fan is provided in the angle of the lower part of the double-wall casing space.

4. A gas fire according to claim 2 or 3, in which the heat-exchange flue means comprise tubes spanning the passage between the double walls ofthe casing to lead combustion gases from the front recess to the flue gas vent and promote turbulentflow ofair through the casing passage around the tubes.

5. A gas fire according to any foregoing claim, in which the burner box plaque is surmounted by artificial fuel through which gas flames can penetrate to enhance a real-fire effect.

6. A gas fire according to any foregoing claim provided with a surround to fit over the front ofthe casing and close around a standard domesticfireplace opening.

7. A gas fire substantially as described with reference to and as shown by the accompanying drawing.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Gas fire for space heating This invention relates to gas fires for space heating and, in its preferred embodiment, provides an openfronted, living-flame gas fire unitto fit into a standard domestic fire-place, usually of a width 16 or 18 inches (408 or 460 mm). According to the invention there is provided a gas fire having an open-fronted, double-walled casing,to fit as a fire-back liner in a domesticfire-place and presenting a front recess, the space within the double walls of the casing providing a heat-exchange pas sage for upward flowofair, between a lowerinletand an upper outlet, for convection heating, and a gas burner box mounted in the lower part of the front recess ofthe casing and presenting a refractory pla queforsurfacecombustion of gas. Otherfeatures ofthe invention are set out in the appended claims. A preferred embodiment is described, by way of example, with reference to the accompanying drawing, in which Figure lisa front elevation of a gas fire, with a surround indicated in broken lines and omitting a fender or decorative basket front or cover as usually provided, and Figure 2 is a sectional side elevation, on the line ll-ll of Figure 1, showing the surround in full lines and the adjacent parts of a domestic fire-place. As shown by the drawing, the gas fire comprises a double-wall metal casing, having a back wall 1 and a front wall 2, which fits as a fire-back liner in a standard domestic fire-place. The back wall 1 rises from a horizontai base3and, with a lower angled part4ofthefrontwall 2which supports a burner box mounting plate5,formsa lower portion 6 of the space between the casing walls. This space portion 6 is of substantially right-angled triangular shape in cross-section (fore-and-aft) and, optionally, houses an electrically driven aircirculating fan 7. From the space portion 6, which air can enter rover the hearth as indicated by the arrow A in Figure 2, extends an upwardly and forwardly inclined air passage 8, behind and sloping upwardly from a burner box 9 mounted on the plate 5 and provided with the usual gas and air inlets and controls as generally indicated at 10 in Figure 1. An upper portion 11 of the space between thewalls 1 and 2 has a front outlet 12forwarm air, as indicated by the arrow B, and is spanned buy a nest of heatexchange flue tubes 13 which lead combustion gases from the front recess 14 of the casing to a flue gas vent grill 15 opening forfiue gasesto exhaust intothe domesticflue 16. The heat exchange nestoftubes 13 promotesturbulentflowof air round thetubes through the upperwall space 11. The burner box 9 has a porous refractory plaque 17, or plaques, at the upper surface of which gas combustion occurs, as is known. The plaque 17 is surmounted by a refractoryfire bed 18 on which are arranged artificial fuel pieces 19, such as coal knobs or logs, between which gas flames can penetrate to give a real-fire effect. The front casing wall 2 may have a stainless steel or other reflector and the casing passage may have a thermal insulating lining 20. Asurround 21, of a size to suit a standardfire-place opening, is provided to fit over the front of the fire casing and close, around the fire-place opening, over and around a casing front plate 22 of the gas fire casing. CLAIMS

1. Agasfire having an open-fronted,double- walled casing, to fit as a fire-back liner in a domestic fire-place and presenting a front recess, the space within the double walls of the casing providing a heat-exchange passage for upward flow fair, between a lower inlet and an upper outlet, forconvec- tion heating, and a gas burner box mounted in the lower part ofthe front recess ofthe casing and presenting a refractory plaqueforsurface combustion of gas.

2. A gas fire according to claim 1, in which the space between the doublewalls of the casing comprises a lower portion, beneath and behind the burner box and of substantially right-angled trianguiar cross-sectional shape, an upwardly and forwardly incoined air passage, behind and sloping upwardly from the burner box, and an upper portion having a front warm airoutletand spanned by heat-exchangeflue means leading from the upper part of the front recess to a flue gas ventto exhaust two a domesticflue.

3. A gas fire according to claim 2, in which an electrically-driven air-circulating fan is provided in the angle of the lower part of the double-wall casing space.

4. A gas fire according to claim 2 or 3, in which the heat-exchange flue means comprise tubes spanning the passage between the double walls ofthe casing to lead combustion gases from the front recess to the flue gas vent and promote turbulentflow ofair through the casing passage around the tubes.

5. A gas fire according to any foregoing claim, in which the burner box plaque is surmounted by artificial fuel through which gas flames can penetrate to enhance a real-fire effect.

6. A gas fire according to any foregoing claim provided with a surround to fit over the front ofthe casing and close around a standard domesticfireplace opening.

7. A gas fire substantially as described with reference to and as shown by the accompanying drawing.