SU1390416A1 - Carburettor for internal combustion engine - Google Patents

Abstract

The invention makes it possible to increase the stability of the fuel metering characteristics. The throttle valve 2 is connected to the drive device 3, the system x.x. It has a bypass channel with throttle body 6, connected with the 1st driving device and dividing the channel into two sections 7 and 8. Both of these sections are connected through emulsion jets 10 and II to the emulsion system 3 The bypass channel has at least a main output (L oo QD About 4 o :) J2

Description

139

hole 13 and additional hole 15о The latter can be connected to a bypass channel in a segment bounded by zones of connection with jets 10 and 11, or connected to a bypass channel in its inlet section and has a fixed-section jet 16 in the body of the throttle body a variable cross section orifice, which may be included in the fluid communication line with one of the outlets, including the primary and secondary. Because crankcase gases are injected through junction 6

ler 16 on the section of the inlet section 7 before the communication of the bypass channel with the nozzle 11, they are directly involved in the formation of the last dilution of the latter, which contributes to the automatic correction of the composition of the mixture at x and x modes and low loads. On the throttling organ 6, tarry substances are prevented from settling and the holes 13 and 15 already deposited on the walls are compacted, which ensures stability of the fuel metering characteristics. 5 з, п. f-ly, 4 silt

one

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

The aim of the invention is to increase the stability of the characteristics of the fuel dosage.

FIGURE 4 shows schematically the proposed carburetor for an internal combustion engine, variants of execution.

The carburetor for the internal combustion engine (FIG. 1) includes a housing 1 with a flow channel and a throttle valve 2 installed in the last throttle 2 installed on the drive roller 3 and dividing the channel into the rear axle 4 and throttle 5, an autonomous system of idling, having a bypass channel with a throttle body 6 located in it, dividing the bypass channel into inlet 7 and outlet 8, and the emulsion system 9 connected through emulsion nozzles 10 and 11 to both parts 7 and 8 of the bypass channel case 1 an outlet channel 12 of crankcase gases, having a main outlet opening 13, provided with a nozzle 14 and communicated with a throttling, nozzle space 5 of the flow channel through the outlet section B of the bypass channel, and an additional outlet opening 15 equipped with a fixed-section nozzle 16 and connected to the bypass channel ia entrance area

7 of the latter in the segment bounded by the junction zones of the emulsion jet 10 and the displacement of the throttle body 6. The drive roller 3 of the throttle valve 2 is connected to the accelerator pedal by means of a driving device (not shown), which is kinematically connected with a lever system (not shown) throttle body 6, made in the form of a rotary slide valve. Hydraulic resistance of the bypass channel of crankcase gases is conventionally depicted in the form of a 17 ”nozzle

The carburettor works as follows.

When the engine is running at low idle speed, the throttle valve 2 is closed and the throttle body 6 is in a position where it is sufficient to fill the engine to rotate the shaft. At the same time, the air passes from the pre-throttle space 4 to the inlet section 7 of the bypass channel, where it is mixed with the fuel emulsion entering through the emulsion jet 10. Next, the air-mixture that forms with the fuel / air mixture passes through the throttling section of the throttle body 6 and enters the outlet section 8 of the bypass channel, where it is additionally enriched with an emulsion coming from the emulsion jet 11, after which it is directed along the outlet section 8 to the throttle space 5 of the flow channel. At the same time, since in the outlet section 8 a practically complete negative pressure is generated in the rear-end space 5, the pressure drop on the nozzle 14 is higher than the critical value. Under the action of this differential, crankcase gases from the discharge channel 12 are sucked into the main outlet 13 and are directed through the jet 14 to the output section 8 of the bypass channel and then into the throttle space 5 of the flow channel "A vacuum is created in the discharge channel 12". higher dilution present in the inlet section 7 of the bypass channel. As a result, a small part of the air-to-air mixture is taken from the inlet section 7 through the constant section nozzle 16 to the additional outlet 15, passes further to the main exit hole 13 and, mixing with crankcase gases, is directed into the throttle space 5 through the nozzle 14 Since there is a liquid phase of fuel in the selected part of the air-fuel mixture, the resinous substances present in the crankcase gases and deposited on the walls of the exhaust duct 12 and the main 13 are flushed away. flax output openings 15 and 14 and the nozzle 16.,

When you press the accelerator pedal, the throttle body 6 begins to rotate, opening the bypass section of the bypass channel, while the throttle to the valve 2 remains closed, as it has a series connection with the throttle body 6, As the last opening section of the bypass channel is opened, the vacuum in its input section 7 increases and crankcase gases from outlet duct 12 begin to flow through both outlet openings 13 and 15 “As the fuel mixture passes through the inlet section 7, the passage through crankcase gases does not lead to the examination of the throttle body 6, as it always turns out to be moistened with a fuel film. Thus, as the engine load increases and the gas breakthrough in its crankcase increases accordingly, the vacuum in addition increases.

from 0 15 0 5 DA,

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five

After the complete opening of the bypass section of the bypass channel, the throttle valve 2 begins to turn and the flow rate of crankcase gases changes according to the change in vacuum throttle space 5. Since crankcase gases are introduced through the nozzle 16 in the section of the inlet section 7 before the bypass channel communicates with the emulsion orifice 11, they are directly involved comfort in the formation of the last dilution, which contributes to automatic correction of the composition of the mixture during idling and low loads (in the range of the throttle body 6), as well as the settling of resinous substances on the latter and the flushing of the resinous substances on the walls of the outlet holes 13 and 15, the stability of the fuel metering characteristics is achieved.

In the embodiment of the carburetor part of fig. 2, a constant-section nozzle 16 of the additional outlet 15 is located in the zone of hydraulic influence of the throttle body 6,

The operation of the carburetor of Fig. 2 is similar to that of the carburetor of Fig. 1, only as the throttle body 6 rotates, the zone of maximum throttling (minimum flow area) approaches the jet 16, which leads to a sharper increase in the vacuum in the exhaust duct 12 than in the carburetor along fig1

In the embodiment of the carburettor, a variable cross-section opening 18 is made in the body of the throttle body 6, which is connected to the hydraulic connection of the outlet channel 12 with an additional outlet 15, and this hole 18 is formed by a groove on the outer surface of the throttle body 6 o

The operation of the carburetor is similar to the operation of the carburetor of FIG. 1, only at low idle speeds the additional outlet 15 is disconnected by the throttle body 6 from the exhaust duct 12, so that the discharge of crankcase gases to

This mode is carried out only through the main outlet opening 13. When the throttle body 6 is rotated at a predetermined angle, the additional outlet opening 15 communicates with the outlet channel 12 through the variable-section opening 18, so that the operation of the additional outlet opening 15 also begins, as described above,

In an embodiment of the carburetor of FIG. “A, in throttle body 6, in addition to the variable cross-section opening 18, an additional outlet 19 of the bypass channel 12 is also provided, communicating with the outlet section 8 of the bypass channel, and the bypass channel 12 is connected to the crankcase of the engine (not shown). Fig. 4 also shows a lever system for kinematic communication with the drive roller 3 of the throttle valve 2, and part of the output section 8 of the bypass channel is made in the body of the throttle body 6 in the form of milling 21,

The carburetor of FIG. 3 is similar to the carburetor of FIG. 3, only crankcase discharge is only carried out in the exit section 8 of the bypass channel, while crankcase gases affect fuel metering through the emulsion jet 11, and the resin is prevented from sinking crankcase gases on the throttle body 6o

Claims (6)

Invention Formula 1 o A carburetor for internal combustion engines, comprising a housing with a flow channel and a throttle valve in the last throttle connected to the drive unit, an autonomous idle system with a bypass channel with a throttle body located in it 15 zo 20 25 P1IM bypass channel at the inlet and outlet areas and connected with the help of a lever system with a drive device, and an emulsion system connected through emulsion nozzles to both sections of the bypass channel, and a discharge channel of crankcase gases in the housing, having at least an outlet outlet, communicated with the flow channel, and an additional outlet, characterized in that, in order to increase the stability of the fuel metering characteristics, the additional outlet of the discharge channel Horn gases are connected to the bypass channel on an Orezka, limited by the zones of connection with emulsion jets. 2 "Carburetor according to claim 1, which is connected with the fact that the additional outlet opening is connected to the bypass channel at the entrance section of the latter and is equipped with a constant-jet nozzle 3 "Carburetor in PP, 1 and 2, O - T and l, due to the fact that the jet of constant cross section of the additional bore hole is located in the zone of hydraulic influence of the throttle body 4 „Pure carburetor five 0 five P o 1, that is, the fact that a variable cross section opening is made in the body of the throttle body, which is included in the hydraulic connection of the branch duct with one of the outlet openings. 5. The carburettor according to claim 4, wherein the variable-section orifice is connected to a hydraulic connection line with the main outlet. 6. The carburetor according to claim 4, wherein the variable cross-section opening is connected to a hydraulic connection line with an additional outlet opening. Yu Fiz. 3 }eight FIG. If