Patent GB-190228003-A (GB)
Title: Improvements in Stoves and Apparatus for Heating Air.
Inventor: DAVIDSON SAMUEL CLELAND
Filed: 1902-12-18
Granted: 1903-11-19
Abstract: 28,003. Davidson, S. C. Dec. 18. Air-heating stoves.-Relates partly to modifications in the apparatus described in Specification No. 18,167, A.D. 1895, for heating large volumes of air. According to the present invention, the air is heated in a number of vertical or inclined tubes arranged in a chamber through which the hot furnace gases are passed. In Fig. 1 is shown an arrangement similar to that described in the prior Specification, except that the air-heating chambers at the sides of the central furnace 1 are replaced by smoke chambers 4 traversed by vertical tubes 5, which open below into a cold-air space 14. The hot furnace gases entering the upper part of each chamber at the back pass to the front above a horizontal baffle 6 and return underneath it to a chamber connected to the chimney. The heated air ascends into a space 15, and is conveyed away by an air duct 16. Air can also circulate upwards in the spaces 18, 19 at the sides of the chambers 4, and thus serves to keep the sides of the metal casings and of the firebox cool. Suitable doors 17 are provided at each end of the smoke chambers for the removal of soot &c. Fig. 5 shows another arrangement in which the chamber 4 containing the air-heating tubes is arranged immediately behind the furnace. The casing of the apparatus and the sides of the smoke chamber 4 are constructed of brickwork, and the tube-plates are made in sections, which are bolted together. A fan 20, placed at the side of the apparatus, forces the air upwards through the tubes into a space 15 and then downwards to an exit opening 21 at the ground level, whence it may be conveyed to a drying-kiln or otherwise dealt with according to requirements. The temperature of the heated air may be regulated by admitting cold air direct to the space 15 through a damper 22. Fig. 8 shows clearly the expansion fittings of the tubes and tube-plates. The edges of the tube-plates rest upon and form a smoketight joint with the flange of a channel iron 23<a> of H-section, built into the brickwork forming the sides of the smoke chamber. Studs 25 are fitted to limit the to-and-fro movement of the plates due to expansion and contraction. In another arrangement, an angle-iron flange, detachably secured to the edges of the tube-plates, rests on the flange of the channel-iron 23<a>. When metal sides are used in lieu of brickwork, as in Fig. 1, their upper edges are flanged to receive the tubeplate. The upper ends of the tubes are flanged to rest in grooves or sockets formed in the tubeplate, while their lower ends project through the bottom tube-plate, as shown. Cement or red lead is used to make the joints at the upper ends smoketight. In Fig. 11 is shown an apparatus in which the tubes are heated by gas jets 35 at the front. A perforated plate or grating 33 is fitted above the tubes to allow the heated air to ascend into the room or compartment in which the stove is placed. For enhancing the appearance of the stove, a corrugated copper plate 34 is placed immediately behind the gas jets. Instead of the gas jets, a grate of ordinary construction may be employed.