| 摘要 |
A downdraft stove with a conical reaction chamber surrounded by a heat-insulating mass is disclosed. A tubular grating installed in the reaction chamber has a substantially vertically oriented central tube open at its upper end and connected at its lower end to an air inlet opening, and a cap supported above the open upper end, the spaced between the cap and the upper end constituting a primary air inlet nozzle. A plurality of grating tubes are radially distributed around and take off substantially horizontally from and communicate with the central tube, thereby defining a grating, and then turn downwardly into a conical shape conforming to the reaction chamber shape and are open at their downward ends to thereby constitute secondary air inlets. The downward-projecting ends of the grating tubes are twisted about the axis of the central tube in order to induce a swirling air flow pattern in the reaction chamber. A gate ring valve is supported within the central tube and is automatically raised or lowered to reveal or cover the openings from the central tube to the grating tubes to thereby adjust the ratio of primary inlet air to secondary inlet air, via temperature responsive means such as bimetals connected for sensing temperature differential between primary and secondary combustion sites. A liquid addition nozzle exits under an extra cap provided in the area of the primary air inlet nozzle.
|
