SU1326756A1 - Carburetor for internal combustion engine - Google Patents

Abstract

The invention of the invention: 1 em to reduce the toxicity of the exhaust gases and n () B1 1sit the cost-effectiveness by improving the dosage of the toner. The float chamber 3 has a drainage tube 20, an air duct, an air cut, 1 21 and an open cut, which lies in Iadton. 4. The porn element 13 of the spool of the idling system of the idling system is connected with a non-critical link that has a cross section of the spool 10. The latter is connected with a flexible drive piece 22 through the actuating valve UITOK 23. With a sharp opening of the slide valve in a closed box, 18 - a great dave. / 1 in the pop, the pressure chamber 3 is increased at a faster rate than in the flow section of the flow channel 2. This is achieved by appropriately fitting the dimensions of the element 13 and the throughput of the jncler 21 and the connecting pipe 19. The resulting impulse of the pressurized pressure in the chamber 3 contributes to the additional. the injection of the top, 1ive through the filter 6. A temporary mixture enrichment is achieved. With a sharp closure of Zona 1nnka 10, chamber 18 creates a vacuum that is transmitted into the iodtoplvnvnoe space of chamber 3. The outflow of fuel through the operating system and 7 decreases, and this prevents the mixture from being overconsidiated. I zp f-ly, I ill. yu (l oo go oi js about:

Description

This invention relates to mechanical engineering, in particular to carburetors for an internal combustion engine.

The purpose of the invention is to reduce the toxicity of exhaust gases and increase efficiency by improving the accuracy of fuel metering.

The drawing shows the proposed carburetor for an internal combustion engine, a cut.

The carburetor for a predominantly motorcycle engine for an internal combustion engine includes a housing 1 with a flow channel 2, a float chamber 3 having a super-fuel space 4 and communicated by its fuel area 5 with nozzles 6 and 7, respectively, the main metering system having a fuel nozzle 8 and the idling system having a fuel jet 9, and a throttle spring-loaded spool 10, made with the possibility of lateral movement relative to the flow channel 2 and provided on the side facing the proto to the internal duct 2, the metering needle 11, having a shaped section 12 for the sprayer 6 of the main metering system, and from the opposite side, a piston element 13 placed in a cylinder 14 fixed to the housing 1, and forming a cavity 15 on the side facing the housing 1 variable volume connected to the atmosphere through the hole 16, and on the opposite side together) 1o with a lid 17 - a closed chamber 18 of variable volume, having a connecting pipe 19 connected to the super-fuel space 4 of the float chamber 3. The last provided with a drainage tube 20, having an air jet 21 and an open cut located in the overfuel space 4. The piston element 13 is made with a cross section exceeding the cross section of the throttle spring-loaded spool, which is connected to the flexible drive unit 22 through the drive rod 23 and is equipped with a spring 24 located between the piston element 13 and the cover 17.

The carburetor works in the following way: P1IM.

When the engine is running at a constant speed mode and a fixed position of the throttle spring-loaded spool 10, when the pressure in the float chamber 3 is constant, the total hourly fuel consumption is directly proportional to the square root of the pressure difference in the float chamber 2 and the pressure in the minimum section of the flow channel 2, formed by the throttle spring-loaded spool 10 and the wall of the flow channel 2. With the smooth opening of the throttle spring-loaded spool 10, the flow area of the flow channel increases a 2, which leads to an increase in pressure in it, and

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the pressure difference is reduced, and the flow area in the atomizer 6 is increased, which is controlled by the shaped section 12, a. The pressure in the float chamber 3 remains unchanged and is maintained through the drain pipe 20. Thus, with an increase in the amount of air supplied to the engine, a corresponding increase in the amount of fuel supplied is obtained, as a result, the supply of the fuel-air mixture of a given composition is achieved.

The abrupt opening of the throttle spring-loaded spool 10 in the closed chamber 18 creates an overpressure, which is transferred through the connecting pipe 19 to the super-fuel space 4 of the float chamber 3. At this point, the pressure in the flow section of the flow channel 2 also increases. greater speed due to the appropriate selection of the sizes of the pin element 13 and the throughput of the air jet 21 and the connecting pipe 19. com opening valve 10 overpressure impulse in the float chamber 3 promotes additional fuel flow through the atomizer 6, is attained so that the temporary enrichment of a prepared mixture of the carburetor, with a sharp increase in the required engine load. After a certain time has elapsed (when the lifting of the spool 10 stops), the pressure in the float chamber 3 through the drainage tube 20 decreases, and the composition of the prepared mixture is restored to a predetermined value.

The abrupt closure of the spool 10 (leading to the forced idle mode) in the closed chamber 18 creates a vacuum transmitted to the super-fuel space of the float chamber 3. This negative pressure compensates for the resulting pressure drop behind the spool (relative to the flow movement), so that the outflow of fuel through the atomizers decreases 6 and 7, thereby preventing the mixture from being over-enriched in this mode of operation.

Thus, the proposed carburetor provides high accuracy of fuel metering (without the use of an accelerator pump and a forced idling economizer), increases the efficiency of engine operation and reduces the toxicity of exhaust gases.

Claims (2)

Invention Formula . A carburetor for an internal combustion engine of a predominantly motorcycle type, comprising a housing with a flow channel, a float chamber having a super-fuel space and communicating with the dispensers of the main metering system and the idling system, and a throttle spring-loaded spool connected to the flexible driving device, the possibility of lateral movement relative to the flow channel and provided on the side facing the flow channel with a metering needle for the main dose nebulizer and on the opposite side, a piston element forming a variable volume closed chamber with the body, having a connecting conduit, characterized in that, in order to reduce the toxicity of exhaust gases and increase the economy by increasing the metering accuracy 326756 four fuel, in it the float chamber is equipped with a drainage tube, having an air jet and an open cut, located in the super-fuel space, and 5 the connecting pipeline of the closed chamber of variable volume is connected to the latter. 2. The carburetor of claim 1, enclosing the fact that the piston element is made with a cross section that exceeds the cross section of the throttle valve, and forms a variable volume cavity connected to the atmosphere from the side opposite to the closed chamber.