An Injector Suitable for Direct Injection of Gas Fuel in Cylinder

Abstract

The invention discloses an injector suitable for gas fuel direct-injection. The injector comprises an injection control device, a gas pressure control device and an injection device. The injection control device comprises a control cavity and a control cavity spring. One end of the control cavity spring is connected to the bottom of the control cavity and the other end of the control cavity spring is connected with a rubber cushion of an opening portion of the control cavity. A pressure regulating hole connected with the gas pressure control device is formed in the control cavity. The injection device comprises an injector body and a double-needle valve body. One end of the injector body is provided with a gas nozzle and the other end of the injector body is connected with an injector cover. The side wall is provided with a gas inflow hole. The protruding outer edge of the injector cover is fixedly connected with the rubber cushion. The double-needle valve body comprises an inner-needle valve body and an outer-needle valve body, wherein the outer portion of the inner-needle valve body is tightly sleeved with the outer-needle valve body. One end of the inner-needle valve body is connected to the rubber cushion and the other end of the inner-needle valve body extends towards the gas nozzle. One end of the outer-needle valve body is connected with the injector cover. By the adoption of the injector, the utilization rate of gas can be increased, more gas fuel can be saved, normal injection operation can be guaranteed, the performance of an engine can be improved, and HC emission is lowered.

Description

technical field [0001] The invention relates to the technical field of gas fuel injection, in particular to an injector suitable for in-cylinder direct injection of gas fuel. Background technique [0002] Most gaseous fuels are hydrocarbon organic fuels mainly composed of small molecules. Such small molecule organic fuels are easy to form a uniform mixture with air. The quality of the mixture is high and the complete combustion of the mixture is useful. Therefore, the use of such fuels in engines helps to meet increasingly stringent emissions regulations. At the same time, because the price of gaseous fuel is lower than that of traditional fuel, it has good economic benefits and is increasingly popular among car owners. [0003] Gas-fueled engines using intake port injection will affect the charging efficiency of the engine because the gas will occupy a part of the volume, and the power of the engine will be affected to a certain extent. At the same time, the use of port i...

AI Technical Summary

Problems solved by technology

Since gaseous fuels are generally stored at high pressure and there is no separate pressurization equipment, it is not possible to use low pressure to control high pressure like diesel, that is, there is no refueling

Because, once the gas injection produces low-pressure gas, this part of the gas cannot be used or is inconvenient to use because it cannot be directly injected into the cylinder.

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