Patent GB-338161-A (GB)
IPC: F24C15/34
Filed: 1929-08-07
Abstract: 338,161. Pfeiffer, W., and Reiss, K.. April 18, 1929, [Convention date]. Heating liquids. - In heating apparatus in which heat is transmitted from an accumulating element to the place of consumption by a liquid medium contained in a closed circuit, the heating effect is regulated by alteration of the quantity of the contained liquid. The invention is described as applied to a cooking-stove, in which pipe coils 1 - - 4 are embedded in a heataccumulating block A containing an electric heater 8. Each pipe coil forms part of an independent heating circuit, two of which include respectively two. series of oven-heating pipes 11, 12, and the other two comprise tubes heating two hot-plates, one of which is shown at 13. Water evaporated in the coil 1 passes as steam up the pipe 16 and thence to a header pipe 17 and through parallel heating-tubes 11, at the top of an upper oven B, the condensed water flowing through a pipe 25 to a condensate collector 31, whence it passes under control of a valve 21 back to the coil 1. The pipes 12 form part of a similar circuit including a condensate collector 32, valve 22 and the coil 2; they form a bottom heating means for the oven B and a top heating means for the lower oven C, which can however be shielded from them by hinged flaps 15. The hotplate 13 is heated from the coil 3 through pipes 35, 37, which serve both as flow and return pipes, the condensate passing into a collector 33 and returning, under control of a valve 23, to the pipe 35 and coil 3. A similar system, including a condensate collector 34 and valve 24 is provided for heating the other hot-plate. To enable the quantity of water in each system to be varied, or to withdraw it altogether, to put a system out of action, the valves 21 - - 24 each comprise two controlling members, one of which regulates the passage of the liquid round the heating circuit and the other connects the circuit to a pipe (not shown) leading to the bottom of an annular hotwater container G which surrounds the heataccumulator A, or to a separate container if distilled water or other liquid is employed. Fig. 7 shows one form of double valve comprising a conical valve 48 controlling the passage between pipes 63 and 43, leading respectively to a condensate collector and to the tank G, and a valve 61 controlling the passage between the pipe 63 and a pipe 64 leading to the evaporator coil. The valve 61 is connected to the valve 48 by a stem 65, and is formed with a, cut-away portion 62; rotation of the combined valve thus controls the passage between the pipes 63, 64, and a longitudinal movement the passage between the pipes 63, 65. The water is introduced into the system when the latter is cold, being drawn in owing to the vacuum which then exists. A construction of condensate collector and spring-loaded valve serving also as a pressure regulator is described for use in cases where the heating circuit is emptied when not in use. Water is heated in the tank G by radiation from the heat-accumulator A and in an auxiliary tank H by radiation from the hotplates and parts of the heating-circuits adjacent it. The tanks are connected by a pipe 5, and a vent pipe 6 is provided. In cases where distilled water or other liquid is employed in the heating- circuits the hot liquid withdrawn from them passes through a collector in the hot-water tank, gives up its heat to the latter, and passes to a separate container. Where ordinary water is employed it is delivered when withdrawn into the tank G.