RU1776853C - Throttle valve of carburetor for internal combustion engine - Google Patents

Abstract

Usage: the field of engineering, in particular carburetors for internal combustion engines and can be used in aviation, shipbuilding and other industries. The essence of the invention: improving the mixing and metering of fuel in all modes of internal combustion engine operation. This goal is achieved by using an S-shaped shutter 3 with a sharp edge in the carburetor, which in all modes of internal combustion engine operation does not create additional hydraulic resistance along the path. It initiates in a vertical plane the mixing chamber of the carburetor is a system of superimposed vortices, different in direction, which contributes to high-quality atomization of the fuel and its metering, 2 il

Description

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The invention relates to mechanical engineering, in particular to carburetors for internal combustion engines, and can be used in aviation, shipbuilding and other industries,

Mixture formation and fuel metering in gasoline engines are the most important processes that determine their fuel economy and toxicity. exhaust gas emissions, dynamic qualities of cars, and in some cases their reliability. A carburetor design is known where the outlet nozzles of the passage channel are curved.

and its end section, when the shutter is in the closed position, is directed tangentially to the wall of the body flowing rope, which ensures air swirling in the throttle space into the vortex flow and promotes the formation of

homogeneous mixture. A disadvantage of the known design is its operability only at idle in carburetors without an astonomic idle system, and the presence of nozzles of the passage channel leads to a partial increase in hydraulic resistance at medium and maximum loads (with the valve fully open).

A carburetor for an internal combustion engine is known in which the air passage channels in the throttle are made in the form of slots evenly spaced around the entire perimeter of the shutter. In this case, the metering elements for air are through sections of slots. A disadvantage of the known design is the possibility of its use only in the mode

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idling and only for carburetors without an autonomous idle system, as well as creating only a more even distribution of the combustible mixture in the combustion chambers without improving the nature of the fuel atomization, i.e. - its dispersion about

The purpose of the invention is the improvement of mixture formation and fuel metering in all modes of operation of the internal combustion engine

This goal is achieved by the fact that in carburetors (single and multi-chamber) with compensation of the mixture by lowering the vacuum pressure at the nozzle, air passes through two sickle-shaped slots formed between the edge of the throttle valve 3 and the wall of the mixing chamber 20, the S-shape of the valve 3, according to the invention (see "Fig. 1), has a significant impact on the nature of the formation of the air flow flowing beyond the throttle space 5 at all operating modes of the internal combustion engine. Moreover, systems are formed in the vertical plane of the mixing chamber nakladyvayuschihs each other vortices different in direction, which helps to improve mixture formation and fuel dosing.

Fig. 1 shows a cross section of a carburetor with a throttle position at idle; on figs 2 is a cross section of a carburetor with a throttle position at nominal load mode

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The carburetor for the LAN includes a housing 1 with a through hole, the walls 2 of which form a mixing chamber, a rotary throttle valve 3 located in the mixing chamber and dividing the latter in the closed position into the throttle and rear spaces Ts and 5, and the system idle, having a channel b for supplying fuel emulsion, unregulated fuel spray 7, adjustable fuel spray 8, in communication with throttle space 5 of the mixing chamber of the rotary throttle 3 has an S-shape y, and its edges, forming sickle-shaped slots with the walls of the mixing chamber, are pointed “

The carburetor works as follows.

When the engine is idling, throttle 3 is

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in the closed position „in engines equipped with carburetors with idle fuel supply to the space behind the throttle, air passes through a, spruce formed between the edge of the throttle 3 and the wall of the mixing chamber 2}, Fuel emulsion comes from the hole 8“ Configuration throttle valve 3 and the sharpness of the edges of the throttle valve, provide a sharp disruption of the air flow from the edges of the throttle valve, intensifying the process of mixing and crushing of the fuel emulsion with air, In the manner of the metric “homogeneous homogeneous mixture fed into the inlet pipe 9 о For carburetors equipped with an autonomous idle system, due to the inevitable suction of air through the slit formed by the edge of the throttle valve 3 and the wall of the mixing chamber 2, the valve performs the same functions under partial load conditions and normal load mode when throttle valve 3 is in the ajar or fully open position In this case (see 2), due to the indicated configuration, the damper 1 ki last continues to perform the functions of an air flow turbulizer, improving the quality of fuel mixture formation with the air flow, forming a finely dispersed homogeneous combustible mixture entering the inlet pipe 9 “Slight co-throttle of the throttle does not produce additional hydraulic resistance along the path at all engine operating modes in comparison with the standard throttle valve “As a private case, it is proposed to produce in serial carburetors ds - the work of the standard shutter of each mixing chamber as shown in Fig.Z. In this case, the sharpness of the edges; throttle should not exceed 1 step 35 ° C „

The use of a throttle valve without introducing any design changes to the carburetor and new adjusting parameters allows: to reduce fuel consumption by up to 20%; sharply reduce the concentration of CO in the exhaust gases, improve the dynamic qualities of the car, eliminating jerks and dips, improve engine starting in both cold and hot conditions

Claims (1)

The claims The carburetor throttle of an internal combustion engine with pointed edges is distinguished in that, in order to reduce FIG. 2 fuel consumption and reduce toxicity by improving the dosage and improving the quality of the mixture formation, the throttle is made S-shaped cross section. Fig L Fig.Z