Stoves and furnaces – Liquid heater
Patent
1981-12-16
1984-03-06
Scott, Samuel
Stoves and furnaces
Liquid heater
126132, 126 77, F24B 700
Patent
active
044347839
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The invention relates to fireplaces in which control means are provided for varying the flow of combustion air to a fire within the fireplace and the control means are capable of varying the flow of convected air around the fireplace.
BACKGROUND ART
In a known controlled-combustion fireplace, sold under the trade mark "BAXI", ducting which opens below the hearth extends away from the fireplace to an inlet opening which permits the ingress of fresh air from outside the room being heated by the fireplace. Control of this fresh air flow is effected by a control vent in the ducting, below the fireplace.
With this form of construction, the fresh air is intended solely for combustion purposes and flows straight through the fireplace at a rate depending upon the size of the opening provided by the control vent. The heat derived from such a fireplace is transferred mainly by radiation.
One known convected air fireplace, sold under the trade mark "JET MASTER", in which an attempt is made to solve this problem, comprises an inner casing, for accommodating a fire and having an open front, a rear panel, an open top panel, a bottom panel and two side panels; outer casing means enclosing at least one first air space below the inner casing and passage means for air extending upwardly from the or each first air space along at least one side panel of the inner casing; front air inlet means opening into the first air space, at the front of the fireplace; and front air outlet means communicatively connected to the passage means and opening at the front of the fireplace, above the level of the front air inlet means.
Convected air which is drawn in from the room to be heated through the front air inlet means at the bottom of the fireplace flows back into the room through the front air outlet means at the top of the fireplace. With this form of fireplace, the heat derived from the fire is greatly increased in that it depends not only on radiation, but also on the heat carried by convected air currents. However, warm air is drawn from the room to support combustion and this causes cold draughts to flow towards the fireplace from doorways, windows and other openings in the room, thereby cooling the backs of people sitting in front of the fireplace and it has been found that the induced convection currents concentrate this flow of cold fresh air along the floor of the room where it is most uncomfortable to the people sitting in front of the fireplace.
DISCLOSURE OF THE INVENTION
The invention as claimed is intended to provide a fireplace in which the defects of known fireplaces are avoided and, in particular, solves the problems associated with the flow of cold fresh air into the fireplace while, at the same time, providing for the transfer heat by convection currents. This is achieved by providing a fireplace in which the outer casing means enclose a second air space below the inner casing; back inlet means open into the second air space at the rear of the fireplace; a control vent opens from the second air space, for controlling flow of air from the second air space into the inner casing; and valve means are disposed within the second air space for use in conjunction with the control vent for varying the flow of air from the back air inlet means into the first air space below the inner casing.
Thus, according to the invention, there is provided a fireplace, for concurrently controlling the flow of combustion air and convected air, comprising an inner casing, for accommodating a fire and having an open front, a rear panel, an open top panel, a bottom panel and two side panels; outer casing means enclosing first and second air spaces below the inner casing and passage means for convected air extending upwardly from the or each first air space along at least one side panel of the inner casing; front air inlet means opening into the or each first air space, at the front of the fireplace; front air outlet means communicatively connected to the passage means and opening at the front of the firep
REFERENCES:
patent: 505237 (1893-09-01), Sheldon
patent: 2283790 (1942-05-01), Cage
patent: 3180332 (1965-04-01), Grushkin
patent: 3190282 (1965-06-01), Bauer
patent: 4170219 (1979-11-01), Hansen et al.
patent: 4254756 (1981-05-01), Wells
patent: 4266525 (1981-05-01), Hall
Price Carl D.
Scott Samuel
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