CNG (Compressed Natural Gas) injection system for automobile

Abstract

The invention discloses a CNG (Compressed Natural Gas) injection system for an automobile. The CNG injection system comprises a gas inlet pipe and a hollow pipe, wherein a plurality of injection holes are formed in the upper end of the hollow pipe; electromagnetic valves are correspondingly arranged on the injection holes; a groove is formed in the inner wall of the hollow pipe; the injection holes are just opposite to the groove; a plurality of electric heating tubes are arranged in the groove side by side; a guiding block is arranged at the bottom of each electric heating tube; a guiding groove matched with the guiding blocks is formed in the bottom of the groove; each electric heating tube comprises a tube body, an insulated material filling the inside of each tube body and an electric heating wire arranged inside each tube body; a binding post is connected to the tail end of each electric heating wire; a small hole communicating with the outside is formed in one end, away from the air inlet pipe, of the groove; each binding post penetrates through the corresponding small hole and is connected with a wiring plug board; a heat conducting plate covers an open end of the groove. The guiding block is arranged at the lower part of the tube bodies of the electric heating tubes and is matched with the guiding groove, so that the placement of the tube bodies is more stable, i.e., the electric heating tubes can be fastened without adding a new fixing structure, and further the aim of optimizing an internal structure of an injection rail is achieved.

Description

technical field [0001] The invention relates to a gas injection rail, in particular to an automobile CNG gas injection system. Background technique [0002] The gas injection rail is a necessary equipment on CNG-gasoline dual-fuel vehicles, but when the temperature is low, the low temperature causes the gas in the low-pressure pipeline to shrink, forming a negative pressure between the gas common rail and the filter, so that the gas injection rail opens It is not easy and affects the normal use of the gas system; we use water heating to heat the gas injection rail to make it work normally, but it is necessary to install a waterway, which increases pipeline interference, is prone to liquid leakage, and increases the difficulty of maintenance. Contents of the invention [0003] The purpose of the present invention is to provide a CNG gas injection system for automobiles, which ensures the normal passage of gas and avoids the occurrence of liquid in the gas pipeline. [0004...

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Problems solved by technology

[0002] The gas injection rail is a necessary equipment on CNG-gasoline dual-fuel vehicles, but when the temperature is low, the low temperature causes the gas in the low-pressure pipeline to shrink, forming a negative pressure between the gas common rail and the filter, so that the gas injection rail opens It is not easy and affects the normal use of the gas system; we use water heating to heat the gas injection rail to make it work normally, but it is necessary to install a waterway, which increases pipeline interference, is prone to liquid leakage, and increases the difficulty of maintenance

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