SU1653545A3 - Internal combustion engine gas fuel feed system - Google Patents

Description

The invention relates to engine and allows to increase the reliability of existing systems for supplying gas fuel to an internal combustion engine. The system contains a cylinder 1 with liquefied gas, reported

with evaporator 5 through shut-off solenoid valve 4, gearbox 8 with dispensers 9 and 10. In idle mode, the Invention relates to engine building, and specifically to power supply systems for internal combustion engines (ICE), in particular to fuel supply systems in multi-fuel carburetor internal combustion engines.

The purpose of the invention is to increase reliability.

FIG. 1 shows the structural scheme of the system; in fig. 2 diagram of the dispenser; in fig. 3 - constructive scheme of the evaporator; in fig. 4 structural scheme of the receiver.

The system contains a cylinder 1 with liquefied gas, placed in it the pipe 2 gas intake, reported 4

The vacuum from the throttle space 19 through the jet 23 and the receiver 20 flows to the control metering valve of the dispenser 9, as a result of which the reduced gas enters the throttle space 19 in the required amount. At partial loads, the control signal is generated by rarefaction both in the rear thrust space 19 and pre-throttle space 18. At elevated loads, the control signal is generated by the underpressure in the pre-throttle space 21 of the secondary mixing chamber of the carburetor 13, and from - the reduction anny gas is supplied in the required amount in both the mixing chamber of the carburettor "ZP 2 f-ly, 4 ill.

cutting a shut-off valve 3 with a shut-off valve, for example electromagnetic, 4, an evaporator 5, communicated with its inlet 6 with a valve 4, and an outlet 7 with a gear 8, metering devices 9 and 10 communicated with the gear 8 through controlled metering valves 11 and 12 .

The carburetor 13 has a primary 14 and secondary 15 mixing chambers and throttle valves 16 and 17 installed in the mixing chambers 14 and 15, respectively. The pre-throttle 18 and throttle 19 spaces ι of the primary chamber 14 of the carburetor 13 are communicated by gas pipelines to the metering device 9 through the receiver 20. Do5 and „„ 1653545

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the throttle space 21 of the secondary chamber 15 is reported by a gas pipeline with a metering device 10.

Pipelines can be equipped with metering nozzles 22, 23 and 24.

In the loop of liquid fuel at the inlet to the carburetor 13 there is a petrol shut-off valve, for example, an electromagnetic valve 25.

Dosing devices 9 and 10 can be made identical. Each of them contains a hollow body 26, which contains a membrane 28 in half of the field 27, which forms chambers 29 and 30 "The chamber 29 is equipped with an actuator of a controlled valve 11 in the form of a hinged rocker 31, spring-loaded on one side by a spring 32 and having a throttling valve on the opposite side the element 33 of the valve 11, which communicates with the gear 8 channel 34. The beam 31 is also kinematically connected, for example by a washer 35, with a membrane 28.

The evaporator 5 is made in the form of two tanks, the housing 36 and 37 of which are in contact with the heat exchange surface 38, for example the pipe of the engine cooling system, the containers along the gas flow are interconnected by a gas pipeline 39 in which the nozzle 40 can be installed.

The receiver 20 is made in the form of a vertically arranged cylindrical hollow body 41, in the inner cavity 42 of which on the axis are placed the upper nozzle 43 communicating with the chamber 29 of the metering device 9, and the lower nozzle 44 communicating with the throttling space 19 of the primary chamber 14 of the carburetor 13, the throttle 18 communicated with the internal cavity 42 of the receiver 20 channel 45, made in the housing 41.

The feed system works as follows.

When using liquid fuel (gasoline), the check valve 4 is in the closed state, i.e. there is no gas in the gas main. Power ICE'is carried out through the carburetor in the usual manner. When switching to gas fuel by a signal from the driver’s cabin, the shut-off valve 25 closes and the shut-off valve 4 opens. · The liquid phase of the gas fuel is fed through pipe 2 to the evaporator 5, where in the tank body 36 evaporates

and due to the throughput of the jet 40 or the selection of the flow area of the pipeline 39 is partially reduced. The amount of liquid gas entering the evaporator 5 is roughly regulated by selecting the capacity of the valve 3. Next, the gas enters the tank body 37, and from there into the gearbox 8. The system is ready for gas-fueled engine operation.

In idle mode, the vacuum from the throttle space 19 through the jet 23 and the receiver 20 is transmitted to the control dosing valve 11 of the metering device 9? it opens it by a certain amount, and the gas injected in the quantity required for the engine to idle goes to the throttle space 19, while the air can enter the receiver 20 through the nozzle 22, generating a control signal and homogenizing the gas-air mixture.

When switching to partial loads when opening the throttle valve 16, the control signal to the controlled metering valve 11 is formed already by a vacuum in the throttle space 19 and a vacuum in the pre-throttle space 18.

The valve 11 opens a large amount, and the gas begins to flow through the nozzles 22 and 23. The presence of the receiver 20 allows you to avoid failure during the transition from idle to partial load.

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When switching to increased loads, when the throttle valve 17 of the secondary chamber of the carburetor 13 starts to open, the control signal is generated by a vacuum in the pre-throttle space 21 and the vacuum through the jet 24 is transferred to the metering unit J. The gas from the gearbox 8 through the metering unit 10 and the nozzle 24 begins to flow into the carburetor 13. Since the control signal is formed depending on the amount of air passing through the secondary chamber, no failure is observed and e with partial to full loads. When the throttle valve is closed, the valve 12 automatically closes as the control signal disappears.

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On the forced idle mode, an additional device can be provided, cutting off the gas supply (not shown), the metering device 9 installed in the line - receiver 20 "

When the engine is stopped, the shut-off valve 4 is closed and the gas stops flowing into the engine, and if the object is stored for storage, in order to avoid gas leaks even the smallest quantities, the valve 3 can be blocked

The proposed system is easy to manufacture and is installed on a gasoline engine with virtually no design changes to the latter. ”

Claims (2)

Claim 1 о Gas fuel supply system for an internal combustion engine, containing a carburetor with a mixing chamber and a throttle valve, a liquefied gas cylinder connected to it via a vapor valve, a gas pressure reducer connected to the evaporator outlet, and a dosing device made in the form of a hollow body with a membrane installed in its cavity with the formation of two chambers, and having a metering controlled valve located at the entrance to the first chamber of a hollow body connected through pre-throttle jets zadrosselnym spaces the mixing chamber, the second chamber of the metering device communicates with the atmosphere, the drive of the metering valve is designed as a rocker mounted in the the first chamber of the metering device with the ability to interact with the membrane and is spring-loaded relative to the housing, and the output of the gas pressure reducer communicates with the entrance of the first chamber of the metering device, characterized in that, in order to increase reliability, the first chamber communicates with the throttle and throttle spaces of the mixing chamber additionally installed receiver, made in the form of a hollow cylindrical vertically located body with two axial internal nozzles, the top of otorrhea communicates with the outlet of the first chamber of the metering device and the lower orifice through - with zadrosselnym 20 with the space of the mixing chamber, and in the receiver wall there is a channel for communicating the internal cavity through the jet with the pre-throttle space located below the level of the middle 5 of the lower pipe ” 2 "The system according to claim" 1, characterized in that the carburetor is made of two-chamber, and the system is equipped with an additional metering device AOR is made similarly to the main and connected inlet to the gas pressure reducer, and the outlet to the pre-throttle space of the second mixing chamber of the carburetor. 35 3. The system according to PP.1 and 2, characterized in that the evaporator is made in the form of sequentially communicated among themselves at least two heated tanks, the first 40 of which are communicated through a shut-off valve with a balloon with liquefied gas, and the latter - with a gas pressure reducer " 32 1653545 21 4