SU1281714A1 - Carburetor for internal combustion engine - Google Patents

Abstract

The invention relates to engine building and reduces exhaust emissions and reduces fuel consumption by optimizing the composition of the combustible mixture during the sudden closing of the throttle valve. The carburetor contains channel 1 of the main metering system with the main and additional nozzles 2 and 12. The latter is installed between the nozzle 2 and the float chamber 3. Between the jets 2 and 12, a variable volume chamber 6 is connected to section 13 of channel 1 with pipe 14, in which back valve 15. Chamber 6 has a working cavity 9 and a movable element 7 driven by a throttle valve 8. At the moment of sharp closing of the valve I, the vacuum in the sprayer 5 decreases. At the same time, the fuel supply to the last One way of eliminating over-enrichment of the mixture. The smaller the section of the orifice 12, the greater the vacuum reaches — in channel 1 in front of the nozzle 2, and the more the fuel is inhibited to the atomizer 5. In the period after the opening of the valve 8, the check valve 15 closes and the discharge valve 11 opens, through which the fuel from chamber 6 it is fed directly to the main air channel 4. 1 sludge. l.U (L x i

Description

one

This invention relates to mechanical engineering, in particular to carburetors for engines of its internal engine.

The aim of the invention is to reduce the toxicity of exhaust gases and reduce fuel consumption by optimizing the composition of the combustible mixture with a sharp closing of the throttle valve.

The drawing shows a schematic structural diagram of a carburetor for an internal combustion engine.

The carburetor contains a channel 1 of the glan of the metering system with the main fuel jet 2, connecting the float chamber 3 s located in the main air channel 4 with the spray gun 5 and the variable volume chamber 6 having a movable element driven by the throttle valve 8 and the working cavity 9. As the camera A variable volume is used for the chamber of the accelerating pump, which is connected to the main air channel 4 in the area of the atomizer 5 by means of the discharge pipe 10, in which the discharge valve 11 is installed.

The carburetor is equipped with an additional nozzle 12 installed in channel 1 between the float chamber 3 and the main fuel nozzle 2. To section 13 of channel 1 between nozzles 2 and 12, pipe 14, in which the return valve 1.5 is installed, chamber 6 is connected. according to the size of the main fuel jet 2 and the volume of chamber 6. In the case where the cross section of the additional jet 42 is smaller than the cross section of the main fuel jet, the composition of the mixture prepared by the carburetor in the established modes is Details will be determined primarily by the size of the additional jet 12.

The carburetor works as follows.

 During the period of engine operation at steady state under load, fuel at a sufficiently high speed through channel 1 flows from the float chamber to the atomizer 5. At the moment of sharp closing of the throttle valve 8, the air flow through the main air channel 4 is fast

The ro decreases, according to which the vacuum is reduced in the caster 5. Simultaneously with the throttle valve cover 8, the moving element 7 of the acceleration pump moves in the direction of increasing the volume of the working cavity 9. At the same time, a vacuum is created in the working cavity 9, the check valve 15 opens and fuel from channel 1 begins to flow into the working cavity 9 of chamber 7. The removal of fuel through the non-return valve 15 from channel 1 in front of the main fuel jet 2 causes a vacuum to appear in it, retarding ue fuel to the nozzle 5.

By braking the fuel supply to the atomizer 5, the overblowing of the mixture composition due to the inertia forces of the fuel in the fuel channel during the period of sharp throttle cover is eliminated. The smaller cross section

additional nozzle 2, the greater the value reaches the vacuum in the channel 1 before the main fuel nozzle 2 and the more. slows down the flow of fuel to the atomizer 5 during the period of abrupt closing of the throttle valve 8.

During the subsequent opening of the throttle valve 8, at the moment of acceleration, moving element 7 moves towards reducing the volume of the working cavity 9 of the chamber 6. At the same time, pressure is created in the working cavity 9, which causes closing of the check valve 15 and opening of the discharge valve 11, through which the fuel from chamber 6 is fed directly to the main air channel 4, which ensures its rapid flow into

each of the cylinders. This also contributes to the check valve 15, which prevents the flow of fuel from the chamber 6 into the channel 1.

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Claims (1)

Invention Formula A carburetor for an internal combustion engine that contains a main air channel, a float chamber communicated through a channel of a main metering system with a main fuel jet and a main air channel, and a variable volume chamber is provided with 3 12817144 In addition to a throttle valve and a fuel jet nozzle placed through a pressure valve with a main channel in the main metering system of the air channel, about a liter and - between the float chamber, and the main floating element, with the purpose of the fuel jet, and the chamber of variables - reducing the toxicity of the exhaust volume is connected to a section of gases and reducing the consumption of the fuel channel of the main dosing system by optimizing the composition of the fuel between the main ones and top-grade blend with abrupt closure by throttling jets.