CN201486703U - An engine dual-fuel intake manifold assembly - Google Patents

Abstract

The utility model relates to an engine dual-fuel intake manifold assembly. The intake manifold is provided with a fuel injection hole and a gas injection hole communicating with the air passage of the intake manifold. In front of the injection hole; the centerline of the gas injection hole is parallel or coincident with the centerline of the airway throat. The gas injection hole of the utility model is arranged behind the fuel injection hole, and the center line of the gas injection hole is parallel to or coincides with the center line of the throat of the air passage, so that the gas is directly pressed into the air passage for combustion under its own high pressure. It not only achieves the purpose of premixing in the air channel, but also greatly reduces the injection loss of gas and injection pressure in the air channel, has little influence on the flow of fresh air in the air channel, and improves the inflation efficiency of the mixed gas and the mixing intensity of the mixed gas. , to improve the power and torque of the engine when using gaseous fuel.

Description

An engine dual-fuel intake manifold assembly

technical field

The utility model relates to the technical field of engines, in particular to a dual-purpose fuel (liquid fuel and gas fuel) engine intake manifold assembly.

Background technique

At present, there are more and more types of engine fuels available in the market, such as oil fuels such as gasoline and diesel and gaseous fuels such as CNG (compressed natural gas), LPG (liquefied petroleum gas), methanol, and hydrogen fuel. In order to make the engine work with a reasonable choice of suitable fuel according to the local environment and fuel economy, an intake manifold assembly that can switch injection between liquid and gaseous fuels is designed. The existing dual-fuel intake manifold assembly includes the intake manifold, the cylinder head intake port connection flange and the fuel injector installation boss, and the intake manifold is provided with a valve that communicates with the intake manifold air passage. Fuel injection holes and gas injection holes. The centerline of the existing gas injection hole is perpendicular to the centerline of the airway throat or forms a certain angle with the centerline of the airway throat, so that the natural gas injected into the airway is directly sprayed to the inner wall of the airway, forming a The reflection of the back and forth airflow causes turbulence, hinders the entry of fresh air, and affects the charging efficiency of the engine.

Utility model content

In view of the above-mentioned deficiencies in the prior art, the purpose of this utility model is to provide an engine intake manifold assembly that can switch injection between liquid and gaseous fuels. This intake manifold assembly uses gaseous fuel It will not produce turbulence and is very conducive to the entry of fresh air.

The purpose of this utility model is achieved in this way: the dual-fuel intake manifold assembly of the engine includes an intake manifold, a cylinder head air inlet connection flange and a fuel injector mounting boss, and the intake manifold is provided with The fuel injection hole and the gas injection hole communicated with the air passage of the intake manifold, the fuel injection hole is located in front of the gas injection hole; the center line of the gas injection hole is parallel to or coincides with the center line of the throat of the air passage.

The technical effects obtained by the utility model are: 1. The fuel injection hole directs the fuel beam to the throat of the air passage in the cylinder head, so that the fuel is better atomized and the mixture is burned more fully; 2. Since the combustible gas does not Additional atomization treatment is required, so the gas injection hole is arranged behind the fuel injection hole, and the centerline of the hole is parallel or coincident with the centerline of the airway throat, so that the gas directly flows along the The air passage is pressed into the combustion chamber, which not only realizes the purpose of premixing in the air passage, but also greatly reduces the injection loss of gas and injection pressure in the air passage, has little influence on the flow of fresh air in the air passage, and improves the charging efficiency and The strength of the mixed gas mixture increases the power and torque of the engine when using gaseous fuel.

Description of drawings

Fig. 1 is a structural representation of the utility model;

FIG. 2 is a sectional view of FIG. 1 .

In the figure: 1-Intake manifold air passage; 2-Fuel injection hole; 3-Injector installation boss; 4-Gas injection hole; 5-Cylinder head air inlet connection flange; 6-Intake manifold.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

Referring to Fig. 1 and Fig. 2, it can be seen from the figures that the dual-fuel intake manifold assembly of the engine includes the intake manifold 6, the cylinder head intake port connecting flange 5 and the fuel injector installation boss 3, the injector The fuel injector installation boss 3 is used to install the fuel injector; the intake manifold 6 is provided with a fuel injection hole 2 and a gas injection hole 4 communicating with the air passage 1 of the intake manifold, and the fuel injection hole 2 is located at In front of the gas injection hole 4; the center line of the gas injection hole 4 is parallel to or coincides with the center line of the intake manifold airway throat. Since the center line of the throat of the gas passage is perpendicular to the connecting flange of the air inlet of the cylinder head, the center line of the gas injection hole 4 is also perpendicular to the connecting flange 5 of the air inlet of the cylinder head.

The intake manifold of the dual-purpose fuel engine designed by the utility model not only guides the fuel beam to the airway throat in the cylinder head when the fuel is used, so that the fuel is atomized better and the mixture is burned more fully; When using gas fuel, the gas can be directly pressed into the combustion chamber along the air passage under its own high pressure, which not only realizes the purpose of premixing in the air passage, but also reduces the loss of gas and injection pressure, and realizes the influence on the flow of fresh air in the air passage. Smaller, improve the charging efficiency of the mixture and the strength of the mixture, so that the power and torque of the engine when using gaseous fuel are improved.

Claims (2)

1. A dual-fuel intake manifold assembly for an engine, comprising an intake manifold (6, a cylinder head air inlet connection flange (5) and a fuel injector installation boss (3), in the intake manifold ( 6) There are fuel injection holes (2) and gas injection holes (4) communicated with the intake manifold air passage (1), and the feature is that the centerline of the gas injection holes (4) is in line with the The centerlines of the airway larynx are parallel or coincident. 2. The engine dual-fuel intake manifold assembly according to claim 1, characterized in that: the fuel injection hole (2) is located in front of the gas injection hole (4).

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