The diaphragm-type power mode economizer is connected by a fuel channel 10 (pic. 47) with the main dosing system of the first chamber. The cavity under the diaphragm 7 is connected by an air channel 6 to the under-throttle space. An economizer jet 9 is installed in the fuel channel. The inner cavity under the diaphragm is connected through a ball valve 8 to the float chamber.
Pic. 47. Scheme of econostat and economizer of power modes:
1 - throttle valve of the second chamber; 2 - main fuel jet of the second chamber; 3 - econostat fuel jet with a tube; 4 - main fuel jet of the first chamber; 5 - throttle valve of the first chamber; 6 - vacuum supply channel; 7 - economizer diaphragm; 8 - ball valve; 9 - economizer fuel jet; 10 - fuel channel; 11 - air damper; 12 - main air jets; 13 - econostat injection tube.
The power mode economizer is activated at a certain vacuum under the throttle valve 5. The ball valve 8 is closed while the diaphragm is held by the vacuum. When the vacuum decreases, the diaphragm opens the ball valve under the action of the spring. Fuel under the action of vacuum in the emulsion well of the first chamber flows from the float chamber through a ball valve, fuel jet 9, fuel channel 10 into the emulsion well. This fuel, together with the fuel leaving the main fuel jet 4, enters the first mixing chamber through the atomizer, equalizing the composition of the combustible mixture during suction pulsation.
The economizer will also enrich the combustible mixture with a significant opening of the throttle valves, when the vacuum under the throttle valve decreases and the ball valve 8 is opened.
Econostat
The econostat is connected to the second mixing chamber and comes into operation with fully open throttle valves at speeds close to the maximum. Econostat enriches the fuel mixture to obtain full engine power.
The econostat consists of a fuel jet 3 (see fig. 47) with a tube, a fuel channel and an injection tube 13 located in the air pipe of the second chamber.
At fully open throttle valves and the maximum crankshaft speed, the vacuum at the outlet of the injection tube 13 increases so much that the fuel from the float chamber through the jet and the tube is sucked into the mixing chamber, enriching the combustible mixture.