CN201003436Y - engine gas mixer - Google Patents

Abstract

The utility model belongs to the field of mechanical manufacturing, in particular to an engine gas mixer using combustible gas with low calorific value as fuel. Including air connection (14), gas connection (4), air intake channel (12), air connection (14) and engine air filter connection, gas connection (4) and gas collection device connection, mixed gas Enter the engine cylinder through the intake channel (12); it is characterized in that it also includes: gas channel (11), gas switch throttle (10), gas switch throttle adjustment lever (8), gas switch throttle shaft (9) , Control cam (1), tappet (2), push rod (3), rocker arm (6), rocker arm shaft (7). Because the utility model adopts the control cam (1) to control the opening and closing of the gas switch throttle according to certain rules, it can effectively prevent the mixing of gas and air in the intake pipe of the engine, and there will be no tempering or explosion during the operation of the engine. Phenomenon, safe operation. Since each cylinder is equipped with the same gas switch throttle (10), adjusting the phase of the control cam (1) can realize the sequential gas supply or simultaneous gas supply of different cylinders.

Description

engine gas mixer

Technical field

The utility model belongs to the field of mechanical manufacturing, in particular to an engine gas mixer using gas fuel.

Background technique

The role of the engine gas mixer is to mix air and combustible gas in a certain proportion. It is a key component of the intake system and is very important to form a uniform and stable mixture. At present, the mixer used in the gas fuel engine is composed of a housing, an upper cover, an air connection, a gas fuel connection, a pressure adjusting screw and a diaphragm. During the intake process of the engine, since the liquefied petroleum gas or compressed natural gas after evaporation and decompression has a certain pressure, the fuel gas can open the diaphragm under the pressure and enter the intake pipe to mix with the air. Due to the high calorific value of liquefied petroleum gas and natural gas and the required gas flow rate is not large, this diaphragm mixer can meet the needs of various working conditions including idling operation. However, the engine burning gaseous fuel with low calorific value needs to inhale more gas during the intake stroke, because the content of combustible gas is only about 25-45%, and the calorific value is only 1/2-1/6 of natural gas, and the gas contains Containing a certain amount of air, it will explode when it encounters an open flame. Using an ordinary gas fuel engine mixer will cause a flameout phenomenon when the engine load changes suddenly. If the engine backfires, it will cause an explosion, resulting in unstable speed and even parking. Thereby this mixer can't meet working needs.

Contents of the invention

The object of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide an engine gas mixer that can be used for gaseous fuels with low calorific value. This new type of mixer can meet the needs of various working conditions including idling operation and load sudden change, and can prevent the engine from backfire and explosion.

The utility model is realized in the following ways:

An engine gas mixer, comprising an air connection pipe, a gas connection pipe, and an air intake channel; the air connection pipe is connected to the air filter of the engine, the gas connection pipe is connected to a gas collecting device, and the mixed gas enters the engine cylinder through the intake passage; It is characterized in that it also includes: gas channel, gas flow throttle, gas switch throttle, gas switch throttle adjustment rod, gas switch throttle shaft, control cam, tappet, push rod, rocker arm, rocker shaft; One end of the channel is connected to the gas connection pipe and the gas collecting device, and the other end is connected to the engine mixed gas intake channel; the gas flow throttle and the gas switch throttle are installed in the gas channel; the gas flow throttle is controlled by the electronic governor; The switch throttle adjustment lever and the gas switch throttle are hinged through the gas switch throttle shaft; the rocker arm is installed on the rocker shaft, one end of the rocker arm is in contact with the push rod, and the other end is in contact with the gas switch throttle adjustment rod; the push rod passes through The tappet is connected to the gas switch throttle control cam.

When the engine is working, the gas flow throttle is opened at an appropriate angle under the control of the electronic governor to provide the engine with the gas flow required for starting and running; while the gas channel switch throttle is controlled by the cam through the tappet, push rod and rocker. Arm control, only when the intake valve of the corresponding working cylinder is in the open state, the corresponding gas channel throttle is opened, and the rest of the time is in the closed state. This effectively prevents the engine gas from entering the intake pipe, thereby avoiding backfire and explosion. For a multi-cylinder engine, if the cam phase of each cylinder is the same and the opening time is the same, then the air supply can be realized at the same time; if the cam phase of each cylinder is different, the opening time is not the same, then the sequential air supply can be realized.

Because the utility model adopts the gas flow throttle to control the amount of gas required for starting and running the engine, and the cam controls the gas switch throttle to open and close according to a certain rule, thereby effectively preventing the engine from backfire and explosion. Realize the stable operation of the gas engine under idling speed, load sudden change and other working conditions, and ensure the stable and normal operation of the engine for a long time.

Description of drawings

Fig. 1 is the structural representation of the utility model

In the figure 1. Control cam, 2. Tappet, 3. Push rod, 4. Gas connection, 5. Gas flow throttle, 6. Rocker arm, 7. Rocker shaft, 8. Gas switch throttle adjustment rod, 9 . Gas switch throttle shaft, 10. Gas switch throttle, 11. Gas channel, 12. Mixed gas intake channel, 13. Air throttle, 14. Air connection.

Detailed ways

Provide a best embodiment of the present utility model below in conjunction with accompanying drawing.

First select the diameter of the appropriate gas channel 11 according to the displacement of the engine, then insert the gas channel 11 into the air mixture intake channel 12, install the gas switch throttle shaft 9 and the gas switch throttle 10 in the gas channel 11; insert the gas switch The throttle valve 10 is hinged with the gas switch throttle adjustment rod 8 through the gas switch throttle shaft 9; the rocker arm 6 is installed on the rocker shaft 7, one end of the rocker arm 6 is in contact with the push rod 3, and the other end is adjusted with the gas switch throttle valve. The rod 8 is in contact; the push rod 3 is connected with the throttle control cam 1 of the gas switch through the tappet 2 . When the control cam 1 rotates, the opening and closing of the gas switch throttle valve 10 can be controlled; the gas connecting pipe 4 is connected to the gas collecting device; the outlet of the mixed gas inlet passage 12 is connected to the engine inlet passage, and the inlet of the mixed gas inlet passage 12 is connected to the air connecting pipe 14 links to each other, and the air connection pipe 14 communicates with the air filter.

In Fig. 1, the gas flow throttle valve 5 is controlled by the electronic governor to provide the required gas flow to the engine according to the engine working conditions. Design the profile line of cam 1 according to the actual working rule of engine and design gas channel 11, the diameter of gas mixture intake channel 12 according to the concentration design of engine displacement and gas fuel; After the intake valve of engine is opened, gas switch Throttle valve 10 is opened rapidly under the drive of control cam 1 and push rod 3, tappet 2, rocking arm 6, and before the intake valve of engine is closed, an amount of gas has entered in the engine. Before the intake valve of the engine is closed, the gas switch throttle valve 10 is quickly closed under the drive of the control cam 1 to prevent the gas from mixing with the air outside the cylinder to cause tempering and explosion. The air throttle valve 13 is controlled by the electronic governor to provide the required air flow to the engine. The mixed gas mixed in a certain proportion enters the combustion chamber of the engine through the mixed gas intake channel 12 . For a multi-cylinder engine, if the cam phase of each cylinder is the same and the opening time is the same, then the air supply can be realized at the same time; if the cam phase of each cylinder is different, the opening time is not the same, then the sequential air supply can be realized.

Claims (1)

1. engine gas mixer, comprise that air is taken over (14), (4), gas-entered passageway (12) are taken in combustion gas, the air-strainer that air is taken over (14) and motor is connected, combustion gas is taken over (4) and is connected with the combustion gas gas-collecting device, and mixed gas enters cylinder through gas-entered passageway (12); It is characterized in that it also comprises: blast tube (11), burnt gas switch closure (10), burnt gas switch throttle adjustment bar (8), burnt gas switch throttle plate pin (9), control cam (1), tappet (2), push rod (3), rocking arm (6), pitman arm shaft (7); Blast tube (11) one ends are connected with combustion gas adapter, combustion gas gas-collecting device, and the other end connects gas-entered passageway (12); Burnt gas switch closure (10) and gas flow closure (5) are installed in the blast tube (11); Burnt gas switch throttle adjustment bar (8) and burnt gas switch closure (10) are hinged by burnt gas switch throttle plate pin (9); Rocking arm (6) is installed on the pitman arm shaft (7), and rocking arm (6) one ends contact with push rod (3), and the other end contacts with burnt gas switch throttle adjustment bar (8); Push rod (3) links to each other with burnt gas switch closure control cam (1) by tappet (2).

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