SU821720A1 - Fuel feeding system for gaseous e i.c. engine - Google Patents

Description

I

The invention relates to mechanical engineering, in particular to engine-building, namely to fuel supply systems to an internal combustion engine gas engine.

Fuel supply systems 9 are known: an internal-engine gas engine comprising a gas supply pipeline from a high-pressure pipeline to individual cylinder gas meters connected to the crankshaft rotation frequency controller through a common rail with a maximum fuel supply limiter installed in the pipeline gas supply and fitted with an actuator connected to the receiver and the exhaust air l.

However, such a fuel supply system to a gas engine allows for an overrun of the rotational frequency and a violation of the relationship between the air and gas flow during the transition from regulating gas to the starting gearbox to controlling the rotational speed regulator.

The circuit of the invention is to ensure reliable engine start and steady load under load.

The goal is achieved by the fact that the setting gear regulator additionally

connected to a high pressure master through a start reducer and connected to a charge air receiver via a control throttle.

The maximum fuel supply limiter is made in the form of a profile stop fixed on the bellows stem connected to the charge air receiver.

The drawing shows a diagram of the system of fuel supply to the gas engine.

The fuel supply system comprises a gas supply line 1 from a high pressure line 2 to the individual cylinder gas metering devices 3. Dispensers 3 are connected to the crankshaft speed regulator 4 through a common rail 5 with a limiter 6 of the maximum fuel supply. The system is equipped with a gear-regulator 7 installed in the gas supply pipeline 1 and equipped with a control unit 8 connected to the charge air receiver. The setting device 8 is additionally connected to the high-pressure line 2 via the start-up reducer 10 and connected to the charge-air receiver 9 via the control throttle 11. The high-pressure link 12 of the high-pressure line 2 is blocked by a pipe with a crane 13. The control throttle 11 is connected via the switch 14 with start-up air duct (not shown). The dispensers 3 are connected via gas inlet valves 15 to the cylinders 16 of the gas engine. The limiter 6 maximum fuel supply is made in the form of a profile stop mounted on the stem of the bellows 17 connected to the receiver 9 charge air.

The fuel supply system is as follows.

The engine starts by closing the valve 13, which connects the fuel supply system to the atmosphere, and opens the valve body 12, which passes gas from the pipeline 2 to the pipeline 1. The starting air flows to the switch 14 and separates the control valve 11 from the control valve 2. Control of the setting device 8 by the gearbox 7 is carried out by a start-up reducer 10 which is tuned to a gradual increase in gas pressure.

When the engine reaches the minimum stable rotational speed by an electropneumatic valve (not shown), the start-up and the howling air are turned off, which causes the switch 14 to operate and connect the throttles 11, and through it the setpoint 8 of the gear-regulator 7 of the highway 2.

As the frequency of rotation of the crankshaft increases, the pressure and air flow increase, which leads to an increase in the opening of throttles 1, an increase in the gas pressure in the setting unit 8 and, ultimately, a proportional increase in the gas pressure in the pipeline 1. Thus, the gas flow increases gradually during start-up. proportional to the increase in air flow, which ensures the smooth start of the engine. With a purge air pressure of less than 20% than the air pressure at nominal mode of operation, the gas flow reaches a value corresponding to the nominal load. At a rotational frequency close to the nominal, a rotational speed regulator 4 is switched on to control the fuel supply depending on the engine load. The bellows 17 connected to the charge air receiver 9 is a pressure and flow sensor for the air involved in the engine operation. As the air flow rate changes, the sylph rod is 17 with the profile stop 6 fixed at its end and moves, limiting the movement of the rail 5 of the regulator 4 in the direction of increasing the fuel supply in accordance with the amount of air that is located.

The application of the proposed supply system in gas engines allows monitoring the ratio of the amount of air and gas, which allows uninterrupted

5 ignition of the fuel mixture at the load modes of operation.

Claims (2)

1. Fuel supply system to the gas engine of internal combustion containing the gas supply pipeline from the high-pressure pipeline to 5 individual dozatorgolts of indra gas connected to the crankshaft speed controller through a common rail with a maximum fuel flow regulator-regulator installed in the pipeline gas supply and equipped with a control device associated with the charge air receiver, characterized in that, in order to ensure reliable engine start and stable operation under load, the control gear regulator is additionally connected to the high pressure line through the start reducer and connected to the receiver charge air through 0 control choke. 2. The system of claim 1, wherein the maximum fuel supply limiter is made in the form of a profile stop fixed on the bellows stem connected to the charge air receiver. Sources of information taken into account in Q examination. 1. Genkin, KI, Aksyonov, DT. and Strunge V.N. Gas engines DG100 and units based on them. M., Nedra, 1970, p. 173-175. .