SU1268778A1

SU1268778A1 - Internal combustion engine fuel supply system

Info

Publication number: SU1268778A1
Application number: SU853874386A
Authority: SU
Inventors: Николай Геврилович Певнев; Леонид Николаевич Бухаров; Владимир Иванович Строганов
Original assignee: Сибирский Ордена Трудового Красного Знамени Автомобильно-Дорожный Институт Им.В.В.Куйбышева
Priority date: 1985-03-22
Filing date: 1985-03-22
Publication date: 1986-11-07

Abstract

Изобретение относитс к системам подачи газообразного топлива в двигатель внутреннего сгорани . Целью изобретени вл етс возможность унификации деталей при переводе двигател на питание жидким топливом . Газовоздушный смеситель выполнен с магистралью перепуска газа из редукторарегул тора в задроссельное пространство, в котором установлено дозирующе-экономайзерное устройство. В корпусе 7 последнего соосно с неподвижным кольцом 15 установлен дозатор 13 переменного сечени , св занный при по.мощи штока 10 с мембраной. Полость, ограниченна мембраной в корпусе 7, сообщена через патрубок 9 с задроссельным пространством с.месител .При изменении разрежени в этой полости мембрана прогибаетс и перемешает дозатор, кольцевой зазор между ними и кольцом 15 измен етс и соответственно измен етс расход газа из редуктора-регул тора по каналам 19, 20 и 21, образующим магистраль перепуска . Корпус 7 выполнен с выступом 16, ( который размешен в виде проставки между отсеками смесител . 1 з.п.ф-лы, 4 ил. сл ю О5 с | 00This invention relates to gaseous fuel supply systems for an internal combustion engine. The aim of the invention is the possibility of unifying parts when switching the engine to liquid fuel. The gas-air mixer is made with a gas bypass line from the reducer regulator to the throttle space in which the metering and economizer device is installed. In the housing 7 of the latter coaxially with a fixed ring 15, a variable-section dispenser 13 is mounted, connected with a membrane by means of a rod 10. The cavity bounded by the membrane in the housing 7 communicates through the nozzle 9 with the throttle space of the motor. When the vacuum in this cavity changes, the membrane bends and mixes the metering device, the annular gap between them and the ring 15 changes and the gas flow rate from the reducer-regulator changes accordingly torus channels 19, 20 and 21, forming a bypass highway. The housing 7 is made with a protrusion 16, (which is placed in the form of a spacer between the mixer compartments. 1 Cp. F-ly, 4, ill. O5 with | 00

Description

Изобретение относитс к машиностроению , в частности двигателестроению, а именно к устройству систем питани двигателей газообразным тонливом.The invention relates to mechanical engineering, in particular, engine-building, in particular, to the arrangement of engine power systems with gaseous gas.

ЦелЕ изобретени - обеспечение возможности унификации деталей при переводе двигател с питани газообразным топливом на питание жидким топливом и наоборот, а также оптимизаци закона изменени подачи газообразного топлива при изменении режима работы.The purpose of the invention is to provide the possibility of unifying parts when the engine is switched from supplying gaseous fuel to liquid fuel supply and vice versa, as well as optimizing the law of change in the supply of gaseous fuel when the operating mode changes.

На фиг. 1 представлена с.хема компоновки смесител и дозируюнхе-экономайзерного устройства; на фиг. 2 - элементы дозирующе-экономайзерного устройства в исходном положении и при работе двигател в режиме полной мощности; на фиг. 3 - то же, в режиме пуска (пунктиром показано положение дроссельной заслонки и дозатора при пуске, а сплошными лини ми при работе с устойчивой частотой вращени .холостого хода); на фиг. 4 - элементы дозирующе-экономайзерного устройства и отсека дроссельных заслонок, изометри .FIG. 1 shows the schematic layout of the mixer and doziruyunhe-economizer device; in fig. 2 - elements of the metering and economizer device in the initial position and when the engine is running at full power; in fig. 3 - the same, in the start-up mode (the dotted line shows the position of the throttle valve and the dispenser during start-up, and solid lines when working with a steady speed of idling); in fig. 4 - elements of the metering economizer device and the throttle valve compartment, isometry.

Дозирующе-эконом а йзерное устройство 1 выполнено с выступом 2, который размещен в виде проставки между отсеками газовоздущного смесител ; отсеком 3 дроссельных заслонок 4 и отсеком 5 смесительных камер, в котором установлена воздушна заслонка 6. Газовоздуп ный смеситель подключен к трубопроводу подачи газа из редуктора-регул тора давлени (не пок.азан) и выполнен с магистралью перепуска газа из редуктора-регул тора в задроссельное пространство с установленными в ней регулируемым дросселем и дозирующе-экономайзерным устройством (ДЭУ). Это устройство содержит корпус 7, к которому прикреплен патрубок 8 подвода газа, патрубок 9, сообщающий с задроссельным пространством замкнутую полость, одна из стенок которой образована мембраной. Шток 10 соединен с мембраной 11, нагружен пружиной 12 и св зан с дозатором 13 переменного сечени , который выполнен в виде гиперболоида вращени и сопр женного с ним цилиндра. Патрубок 8 прикреплен к выступу 2 двум винтами 14 (фиг. 2, 4) соосно с дозатором, внутри патрубка размещено неподвижное кольцожиклер 15 с экспериментально подобранным проходным сечением.The dosing and economy unit device 1 is made with a protrusion 2, which is placed in the form of a spacer between the compartments of the gas-mixing mixer; compartment 3 of the throttles 4 and compartment 5 of the mixing chambers in which the air damper 6 is installed. The gas-supplied mixer is connected to the pipeline supplying gas from the pressure regulator-regulator (not shown) and is connected to the gas bypass line from the regulator-regulator to throttle space with an adjustable throttle installed in it and a dosing-economizer device (DEU). This device includes a housing 7, to which a gas supply pipe 8 is attached, a pipe 9 which communicates with a throttle space a closed cavity, one of the walls of which is formed by a membrane. The rod 10 is connected to the membrane 11, is loaded with a spring 12, and is connected to a dispenser 13 of variable cross section, which is made in the form of a hyperboloid of rotation and a cylinder coupled to it. The pipe 8 is attached to the protrusion 2 by two screws 14 (Fig. 2, 4) coaxially with the dispenser, inside the pipe is placed a stationary ring die burner 15 with an experimentally selected flow section.

Выступ (проставка) 2 состоит из двух пластин: верхней 16 тонкой и нижней 17, и из внутренней прокладки 18. Магистраль перепуска газа на участке между ДЭУ и задроссельным пространством смесител вынолнена в виде каналов в выступе и в отсеке дроссельных заслонок. Один канал 19 выполнен в виде выфрезеровки в нижней пластине 17 и сообнген со смесительной камерой . Канал 20 соединен с эмульсионным колодцем 21, который может служ.ить дл системы холостого хода при работе двигател на бензине. На этот случай предусмотрен винт 22 регулировки качества горючей смеси.The protrusion (spacer) 2 consists of two plates: the upper 16 of the thin and the lower 17, and of the inner gasket 18. The gas bypass line in the section between the DEU and the throttle space of the mixer is made in the form of channels in the protrusion and in the throttle valve compartment. One channel 19 is made in the form of milling in the bottom plate 17 and is combined with a mixing chamber. Channel 20 is connected to an emulsion well 21, which can serve for an idling system when the engine is running on gasoline. For this case, a screw 22 is provided for adjusting the quality of the combustible mixture.

При пуске двигател дроссельна 4 и воздущна 6 заслонки прикрыты, в задроссельном пространстве создаетс разрежение, которое передаетс в вакуумную полость редуктора-регул тора и в полость ДЭУ, ограниченную мембраной II. Клапан второй ступени редуктора (не показан) при этом открываетс , заполн объем второй ступени редуктора и патрубок 8 подвода газа. Под действием разрежени дозатор 13 вт гиваетс , преодолева сопротивление пружиныWhen the engine is started, throttle valve 4 and air 6 are closed, a negative pressure is created in the throttle space, which is transmitted to the vacuum cavity of the regulator-regulator and to the DEU cavity limited by membrane II. The valve of the second stage of the reducer (not shown) opens, filling the volume of the second stage of the reducer and the gas supply nozzle 8. Under the action of vacuum, the dispenser 13 is retracted, overcoming the resistance of the spring

12,и газ проходит в смеситель через сечение, образованное кольцом-жиклером 15 и профилем дозатора 13. Профиль дозатора имеет форму гиперболоида (образован вращением гиперболической кривой), поэтому даже при пульсирующем перемещении дозатора 13, что наблюдаетс при проворачивании двига0 тел стартером, открываетс достаточное проходное сечение дл образовани обогащенной горючей смеси, необходимой дл запуска двигател (фиг. 3). Как только двигатель запустилс , максимальное разрежение вт гивает дозатор 13, проходное12, and the gas passes into the mixer through the section formed by the ring-jet 15 and the metering unit profile 13. The metering unit has the shape of a hyperboloid (formed by rotating the hyperbolic curve), so even with a pulsating movement of the metering unit 13, which is observed when the engine turns, the starter opens enough the flow area to form an enriched combustible mixture necessary to start the engine (Fig. 3). As soon as the engine has started, the maximum vacuum is drawn in by the dispenser 13,

сечение уменьшаетс , дроссельна заслонка 4 прикрываетс , воздущна заслонка 6 открываетс , газ поступает через фрезерованный канал 20 в эмульсионный колодец 21, образу при этом обедненный состав горючей смеси. Устойчива частота холостого хода достигаетс подбором проходного сечени канала 21 регулировочным винтом 22 и степенью прикрыти дроссельной заслонки. При резком открытии дроссельной заслонки разрежение в задроссельном пространстве надает, воздействие его на мембрану 11 уменьшаетс , пружиной 12 диафрагма со штоком 10 и дозатором 13 возвращаетс в положение ближе к исходному (фиг. 2). В двигатель поступает порци газа через увеличенное проходное сечение канала, образо0 ванного кольцом-жиклером 15 и дозаторомthe section is reduced, the throttle valve 4 is covered, the air valve 6 is opened, the gas enters through the milled channel 20 into the emulsion well 21, thus forming a lean composition of the combustible mixture. A steady idle frequency is achieved by selecting the passage section through the channel 21 with an adjusting screw 22 and the degree of throttle cover. With a sharp opening of the throttle valve, vacuum in the throttle space is impacted, its effect on the membrane 11 is reduced, the diaphragm with the rod 10 is spring-loaded 12, and the dispenser 13 returns to the position closer to the initial one (Fig. 2). A portion of the gas enters the engine through an enlarged flow area of the channel formed by the jet ring 15 and the metering unit.

Claims

13. In this case, the engine failed to operate, since the required amount of gas is determined by the flow area of the channel formed by the jet ring 15 and dispenser 13, and as the vacuum decreases, the gas flow through channel 20 decreases and its flow increases through channel 19 into the mixing chamber. The reverse picture is obtained when the throttle valve is closed. 4. The engine rotational speed will steadily increase, since there is no over-enrichment of the mixture. With a fully open damper, which corresponds to the maximum power mode (Fig. 2), the vacuum is minimal in the throttle space, the spring 12 returns the diaphragm 5 and 11 with the choke 10 and the dispenser 13 to the initial position, which corresponds to the maximum flow area and, accordingly, the maximum gas flow. The engine is stable in all modes of its operation with the proposed design due to the fact that the DEU is mounted on a spacer placed in the high vacuum zone of the mixing chamber, and the connecting hoses of the main metering system and the idling system are excluded, and the required gas flow rate in all its modes of operation is determined is the experimentally selected diameter of the muzzle ring 15 and the hyperbolic shape of the dispenser 13. With sharp openings of the throttle, there is no over-enrichment of the mixture and the engine without ovals gaining frequency because the required "local enrichment of the mixture, which was observed in the carburettor on petrol by the action of the accelerating pump, in this case defined variable cross-sectional shape of the dispenser: hyperbolic shape of longitudinal section of its Owned gives the desired portion of the enrichment. Further movement of the dispenser is designed to produce an economical combustible mixture, and when moved to a cylindrical shape, to obtain an enriched combustible mixture necessary to remove the maximum power from the engine. The need for a variable cross-sectional shape of the dispenser 13 is due to the fact that, as shown by the analysis of the engine load and speed characteristics, the change in power is not proportional to the change in vacuum in the intake manifold. The nature of the vacuum change in the intake manifold is compensated by the characteristic of the spring 12 DEU, and the gas consumption is hereby the variable cross-sectional shape of the dispenser 13 and the magnitude of its linear displacement. The sensitivity of DEU is better than the larger stroke of the dispenser 13. Studies show. The sensitivity of DEU is quite satisfactory, if for every 30 mm Hg. Art. the stroke of the dispenser 13 is 1 mm. Claims. The gaseous fuel supply system of the internal combustion engine, comprising a pressure regulator, a gas mixer connected to it, with mixing chambers, throttle valves, and a gas regulator bypass from the reducer regulator to the throttle space of the mixer, with adjustable throttle and metering and economizer installed in it. a device in the form of a casing and a variable cross-section dispenser, placed in the casing coaxially with a fixed ring and connected with a membrane brush, which limits the cavity communicated with the throttle space, characterized in that, in order to ensure the possibility of unification of parts when switching the engine from the gaseous fuel supply to the liquid fuel supply and vice versa, the mixer housing is made integral in the form of the mixing chamber compartment and the throttle valve compartment with adjustable location the throttle in the latter, and the housing of the metering and economizer device is made with a protrusion, which is placed in the form of a spacer between the compartments of the mixer housing, and the trunk line epuska gas in the area between the dosing device and ekonomayzerny.m-zadrosselnym mixer space is formed as a channel in the projection and in the compartment throttle.

2. The system of claim 1, wherein the variable cross-section dispenser is designed as a hyperboloid of rotation and a cylinder associated with it.

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