Natural gas engine

Abstract

The invention discloses a natural gas engine. The natural gas engine comprises an air cylinder, an air cylinder cover, a flame ejector module, a natural gas main path and a natural gas branch path, wherein the flame ejector module is arranged between a gas inlet valve and a gas outlet valve of the air cylinder cover and comprises an ejector body and an ejector head, a sparking plug is mounted inside the ejector body, the side wall of the ejector body is provided with a gas inlet, the ejector head is of a hollow cavity structure, the cavity is a combustion chamber of the ejector and communicated with the gas inlet, and the ejector head is provided with a flame ejection nozzle and extends into the combustion chamber of the air cylinder; the natural gas main path mixes natural gas and fresh air into thin mixed gas and is in butt joint with the combustion chamber of the air cylinder, and the gas inlet valve controls the inlet of the thin mixed gas; the natural gas branch path is in butt joint with the combustion chamber of the ejector and conveys pure natural gas into the combustion chamber of the ejector; the sparking plug ignites the pure natural gas inside the combustion chamber of the ejector timely, flame inside the combustion chamber can be ejected from the flame ejection nozzle to ignite the thin mixed gas inside the combustion chamber of the air cylinder and further drive the piston inside the air cylinder to work. The natural gas engine can achieve rapid and stable thin mixed gas combustion through relatively low ignition energy.

Description

technical field [0001] The invention relates to the field of engines, in particular to the structure and construction of a natural gas engine. Background technique [0002] Traditional natural gas engines usually use an open combustion chamber, that is, the spark plug directly ignites the mixture of gas and air in the combustion chamber. And there is only one way of intake air, that is, fresh air and gas are mixed through the mixer and then enter the intake pipe, and then enter each cylinder through the air passage of the cylinder head. [0003] There are many disadvantages in the structure and working principle of the above-mentioned natural gas engine: the degree of lean mixture combustion that can be achieved is limited, because the mixture in the cylinder is directly ignited by the spark plug, high ignition energy is required, and the reliability and durability of the spark plug are required. Harsh, and unstable combustion and flame spread, prone to fire. In addition, ...

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Problems solved by technology

[0003] There are many disadvantages in the structure and working principle of the above-mentioned natural gas engine: the degree of lean mixture combustion that can be achieved is limited, because the mixture in the cylinder is directly ignited by the spark plug, high ignition energy is required, and the reliability and durability of the spark plug are required. Harsh, with unstable combustion and flame propagation, prone to fire

In addition, in terms of structure, in order to ensure the compression ratio, the volume of the combustion chamber needs to be increased compared with the diesel engine. Therefore, it is necessary to design a special cylinder head for a natural gas engine with a part of the combustion chamber with a complex structure, or to add as much as possible to the structure of the diesel engine. Large piston volume, which affects piston reliability

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