GB463283A - Method of charging an internal combustion engine with solid pulverised fuels - Google Patents

Abstract

463,283. Powdered - fuel engines; valves. PAWLIKOWSKI, R. Nov. 25, 1935, No. 32635. Convention date, May 18. [Classes 7 (ii) and 7 (vi)] In a method of charging an internal-combustion engine wherein powdered fuel is transferred from a hopper 4 to a precombustion chamber 3 through one or more intermediate chambers 5, which are connected alternately but not simultaneously with the hopper 4 and with the chamber 3, a pressure difference between the hopper and the chamber 5 next to the chamber 3 is produced by relieving that chamber of pressure above atmospheric, either by means of a controlled connection 16 with the atmosphere or by connection with a space at lower pressure than atmospheric, the removal of the pressure difference being successively effected by connecting the hopper or any one of the intermediate chambers, if possessing the higher pressure, only with the following space possessing the next lower pressure, the remaining spaces being shut off. The hopper outlet is controlled by a valve 13, the passage 16 by a valve 15, and the inlet to the chamber 3 by a valve 12. The valve 15 is opened at the time when the charge is igniting. The passage 16 may also serve to admit air to the chamber 3 to assist in delivering the charge thereto, and it may remain open during the compression and ignition strokes to allow any gases escaping past the valve 12 to pass into the open air. In the case of a four-stroke engine, a vacuum may be produced in the chamber 5 by connecting it with the chamber 3 during the suction stroke. In the case of a two-stroke engine, the hopper 4 is under pressure, the chamber 5 being connected to the chamber 3 during the scavenging period. The engine governor may alter the difference in pressure between the hopper 4 and the chamber 3 to control the amount of powder delivered ; e.g., the pressure in the hopper 4 may be increased, the chamber 5 may be shut off from the chamber 3 earlier or later to vary the suction in the former, or air may be admitted through the passage 16. In a modification, an air tube is placed in the hopper 4 so that the air carries powder along with it ; in a two-stroke engine, compressed air is supplied to the tube. In a further modification, Fig. 4, a plunger 7 working in a cylinder 8 communicating with the chamber 5, through a controlled passage 21 is adapted to increase the suction in that chamber and may increase the pressure during transfer of the charge to the chamber 3 ; the amount of powder delivered may then be controlled by varying the stroke of the plunger. In a modification of this form, the cylinder 8 is arranged between the hopper 4 and the chamber 5, and the valves 12, 13 form the pump valves. In the form shown in Fig. 6, powder mixed with air admitted through a passage 17 is drawn into the cylinder 8 during the suction stroke of the plunger 7, the valve 13 being open, and is forced into the chamber 3 during the down stroke, a sleeve 11 forming the outlet valve ; the air passage 16 is shut off by the edge 15 of a plunger rigid with the valve 12. Specification 236,756, [Class 7 (ii)], is referred to.