Patent GB-196943-A (GB)
Abstract: 196,943. Zuberbuhler, A. May 1, 1922, [Convention date]. Air-heating stoves; closed solid-fuel stoves; gas stoves; dampers; air supply for combustion; casings and heat-radiators; smoke, consuming.- In a heating-apparatus or stove comprising means for effecting substantially complete combustion of the gases by a controlled supply of secondary air, the residual gases,descend slowly to the bottom of the apparatus through a chamber enclosing at least partially an air-heating jacket for the secondary air which surrounds the source of heat, the gases being, then withdrawn through an outlet pipe of small cross-section compared with that of the chamber. The stove or heating-apparatus shown in Fig. 1 comprises a heat-radiating body 1 in which heating gases, such as smoke from a primary heating-apparatus, circulate, the gases entering through a passage 5 surrounded by an air-jacket 7 and leaving through a passage 11 surrounded by an air-jacket 12 which communicates with the jacket 7 by a passage 13. The gases come into contact with an electrical or other ignition device 6 in the passage 5, are consumed with air heated by passing through the jacket 7, slowly descend to the bottom of the heat-radiating casing, and are withdrawn through the passage 14. When both the ports 9 and the ports 14 are open, air passes upwardly through the jackets 7, 12 and passes out in a heated state through the ports 14; when the ports 9 are closed, air passes in through the ports 14, is heated in the jacket 12, and passes to the jacket 7. In the modification shown in Fig. 5 the body is made in two telescopic parts 2, 22 in order that the heat-radiating surface may be varied by adjusting the top portion 22. The exit passage 11 passes through the side of the stove, and the lower end 23 is adjustable in height in order to vary the level at which the waste gases leave. Openings 21 allow air to pass from the jacket 7 to the passage 5. As shown in Fig. 5, the apparatus is adjusted for the maximum transmission of heat from the body by radiation; by telescoping the part 22 on the part 2 of the body and at the same time opening the ports 9 the transmission of heat by radiation is reduced to a minimum whilst hot air is delivered through the ports 19 as described in connection with Fig. 1. In a modification of the form shown in Fig. 5, the airjacket 12 and the adjustable lower end 23 of the exit passage 11 are omitted. Figs. 6, 7 show a closed solid-fuel stove of similar construction, comprising a fire space 26 above which is an " ignition chamber " 25, a space 27 intervening between the two. During the period of ignition, in which fuel is burnt in the chamber 25, the gases pass into the body 1 through the opening 30 and thence by a port 37 controlled by a tubular damper 38 to the outlet passage 11. During normal operation the port 37 is closed, the gases from the fire-space 26 first ascending to the top of the body 1, then descending to the bottom and leaving by the passage 11. Air jackets 7, 12 surround the fire-space 26 and the passage 11 respectively, and communicate by openings 33; by means of regulating dampers the direction of the air circulation may be varied in a similar way to that described in connection with the corresponding passages shown in Figs. 1, 5. In a modification, the body is surrounded by a waterheating jacket, and a rotary cylindrical damper controls the ports 30, 37 simultaneously and also the passage of air from the jacket 7 to the upper part of the body 1.