GB1011620A - Blocking arrangements for the fuel supply means of reversible internal combustion engines - Google Patents

Abstract

1,011,620. Fluid-pressure servomotor systems. A.B. GOTAVERKEN. April 16, 1964 [April 29, 1963], No. 15784/64. Heading G3P. [Also in Division F1] A system for controlling the starting of a reversible, marine Diesel engine by compressed air has means for preventing the supply of fuel until the engine has attained a predetermined rotational speed in the selected direction. A starting air distributor 8 driven from a hub 2 which is chain driven from the engine crank shaft controls starting air valves 11 at each cylinder, a supply to the distributor 8 from a line 24 being suitable for "ahead" rotation and from a line 25 for "astern" rotation. The valves 11 are supplied through a valve 10 from a compressed air line 9. The engine cam shaft 1 and the fuel injection pumps (not shown) are driven from the hub 2 through a clutch 4 controlled by a servomotor 27 and having lostmostio to give different timings for the two directions of rotation. A threaded guide device 32 moves axially and so adjusts a valve 28 according to the direction in which the engine is rotating. Also driven by the hub 2 is a minimum speed governor 7 for starting purposes and an overspeed governor 6 which is connected with linkage 16, 18 by which the fuel pumps are adjusted from a control device 17. To start the engine in the "ahead" direction a control console 12 is set to open a valve 14 which allows compressed air from the line 9 to pass from a conduit 22 and reduction valve 23 to a line 43 where it moves a valve 29 to the left, a position which corresponds with "ahead" operation. Compressed air also passes through a conduit 44 to open a valve 36 and though a changeover valve 33 to open a valve 37. Compressed air will also be effective in a conduit 51 from which it has access through a branch 55 and valve 34 to a conduit 57 where it holds up a piston in a cylinder 38 to prevent the fuel control 17 from operating and to hold a valve 40 open and a valve 41 closed. Thus, compressed air from the line 9 is able to pass through a conduit 47, the valve 37, conduit 48, valve 40, conduit 49, valve 36 and conduit 24 to the distributor 8. It can also pass from the valve 40 to a conduit 50 to open the valve 10 and operate the servomotor 27. The engine is then rotated by compressed air and provided the direction of rotation corresponds with that selected the two valve 28, 29 will be so positioned that compressed air from the conduit 51 will be able to pass. A valve 30 will, however, block the passage of compressed air until the engine speed has attained a certain value when the governor 7 will cause, through an electrical, mechanical or fluid pressure connection 58, operation of the valve 30 to admit compressed air through a conduit 56 to the valve 34 which is then operated to vent the conduit 57 to free the piston in the cylinder 38 and allow operation of the fuel control device 17 under the control of a transmitter 15 actuated by the console 12. Movement of the device 17 closes the valve 40 and opens the valve 41 to vent the conduit 50 so releasing pressure from the actuator of the valve 10 and from the servomotor 27. For "astern" operation the valve 13 is opened by the console 12, the valve 29 is spring-urged to the right, the valve 35 will be opened instead of the valve 36, and the valve 28 will move to the left as the engine begins to rotate in the "astern" direction. Otherwise operation is as for the "ahead" direction. As shown, the fuel pumps are controlled by the device 17 through a level 19 with a fixed pivot 20, but a second control means may act at the point 20.