SU55411A1 - Pneumatic controlled diaphragm fuel pump - Google Patents

Description

In the pneumatic diaphragm fuel pump according to the invention, the bypass valve of the pump is controlled by means of a special rocker mechanism. To bring the last moving stone to work, it is connected by a lever transmission with a piston, which on one side is under the influence of a vacuum in the suction pipe, and on the other under atmospheric pressure.

In FIG. 1 shows a longitudinal vertical section of a pneumatically adjustable diaphragm fuel pump; FIG. 2 is a cross section of it. |

Diaphragm 1 pump equipped with I bypass 2 and pressure 5 | valves, bends from the movement of the pusher 5 under the action of i of the lever 7, driven by the I cam 8 connected to the engine shaft.

In order for the engine to work normally, i.e., would give the appropriate power and would have low specific fuel consumption, it is necessary to have in all modes a constancy of the composition of the working mixture, i.e. the constancy of the air excess factor, or rather, the preservation of a certain law its change depending on the mode. For a transport engine, this question arises most dramatically, since the variety of road conditions that determine engine load cannot be foreseen by any kind of dependence, therefore an appropriate mechanism is necessary for adjustment, which can measure the appropriate amount of fuel depending on the amount of air received into the cylinder. .

For this, the pump relief valve is controlled by a rocker mechanism 6, 14, the stone 6 of which is connected by a lever gear with a piston 9. The latter is on the one hand affected by the vacuum pressure behind the throttle in the suction line through the washer 10 having a calibrated orifice, and on the other by atmospheric pressure.