Patent GB-223647-A (GB)
Abstract: 223,647. St÷hr, M. July 23, 1923. Closed solid - fuel stoves; air-heating stoves; dampers; grates; air, moistening and purifying.- The air supply to, and the discharge of waste gas from, a closed solid-fuel stove, are controlled by three rotary dampers mounted on a common spindle in a drum-like casing divided into three compartments, the damper in the central compartment controlling the air supply and those in the outer compartments the waste gases, the compartments being connected to passages within the stove in such a way that the direction of flow of gases in the latter may be varied. The stove comprises, in superposition, a grate R, a combustion chamber f, a perforated gasifying-chamber g separated from the latter by a narrow space s, and a filling-shaft 30. Arched air-supply gratings 14 are arranged in front of the lower part of the gasifying-chamber. The space between the stove casing and the back of the chamber g is divided by angular partitions 31 into central and side chambers 4, 7, Fig. 11, the former being in direct communication with the space surrounding the combustion chamber f, from which the latter .are separated by the partitions. At the rear of the stove is a cylindrical casing 34 containing a drum r, shown separately in Fig. 16, divided into central and side chambers 38, 39 containing dampers v, k respectively, which are mounted on a common rotary spindle 40. Slots 5, 8 in the walls of the side chambers 39 provide communication respectively with the combustion chamber f and the side chambers 7 at the rear of the gasifying chamber, and slots 9, 11 lead respectively to the chimney outlet 10 and to flues 6 connected to flues 6<a> in the base of the stove. Slots 1<a>, 1<b>, 1<c>, 2, 12 are arranged as shown in the wall of the central chamber 38. Figs. 1 and la show sections of the stove through the central and side chambers respectively of the drum r, the dampers being adjusted for starting the stove. With this adjustment, air passes through the slots 1<a>, 1<b>, 2 to the combustion chamber f, and through the passage 3 to the chamber 4, from which it passes to the gasifying chamber g. Air from the space surrounding the combustion chamber f also passes through the side chambers of the drum, by way of the slots 5, 11, through passages 6 to conduits 6<a> in the base of the stove, whence it rises through conduits 6b and is supplied in a heated condition to the space 42 in front of the gasifying chamber f. The waste gases pass into the chambers 7, and thence through the slots 8, 9 of the side chambers of the drum to the outlet 10. Figs. 2 and 2a are sections corresponding to Figs. 1 and 2 showing the dampers adjusted for a strong fire. The air is admitted as before, but the space around the combustion chamber f is connected through the slots 5, 8 directly to the chambers 7, through which air is thus supplied to the gasifying chamber in addition to that supplied through the chamber 4. The combustion gases pass out at the front face of the gasifying chamber and by way of the conduits 6<b>, 6<a>, 6 to the outlet 10. By turning the dampers further in the same direction the air supply may be reduced or shut off. Air for circulation in the room passes into a chamber 18 at the base of the stove, partly through a pipe 17 and partly through the slot 1<c> in the damper casing. It then passes through vertical ducts 15, 20 at the corners of the stove to a chamber 23 at the upper part and thence by tubes 24 to a chamber containing water, the steam from which is condensed on the top of the chamber by an external water tank 27 and drops again in a fine shower. The air thus heated, moistened, and purified passes into the room, or is conveyed away by a pipe 22.