Diesel engine multi-fuel oil spraying pump structure

Abstract

The invention discloses a diesel engine multi-fuel oil spraying pump structure. The diesel engine multi-fuel oil spraying pump structure comprises a plunger, a pump body, a work cylinder hole way, a pump cavity, a free piston, a pressure transfer oil cylinder hole way, an oil way, an annular lubricating oil groove and a lubricating oil inlet one-way valve. One end of the pressure transfer oil cylinder hole way penetrates the pump cavity, the other end of the pressure transfer oil cylinder hole way is provided with the lubricating oil inlet one-way valve, the free piston is arranged in the pressure transfer oil cylinder hole way to divide the pressure transfer oil cylinder hole way into a pressure transfer cavity between one end of the free piston and the pump cavity and a lubricating oil cavity in the other end of the free piston, one end of the oil way is communicated with the lubricating oil cavity, and the other end of the oil way is communicated with the annular lubricating oil groove. through the structure, fuel leakage of multiple kinds of fuel of super high pressure oil pumping can be solved, it is ensured that that the oil pumping pressure reaches above 2500 bar, lubricating of the plunger is ensured, direct contact between the plunger and the cylinder hole way can be avoided, wear of the plunger and the work cylinder hole way can be overcome, work reliability can be effectively improved, and the work service life can be prolonged effectively.

Description

technical field [0001] The invention relates to a multi-fuel fuel pump for a diesel engine, in particular to a multi-fuel injection pump structure for a diesel engine, and belongs to the technical field of internal combustion engines. Background technique [0002] Diesel engine has high thermal efficiency and has become a widely used engine. As the world's oil resources are decreasing year by year, the price has risen sharply and the emission regulations of various countries have become increasingly stringent, in order to adapt to the increasingly stringent emission regulations and the requirements of reducing fuel consumption, as well as the market for burning low-viscosity alternative fuels such as dimethyl ether and methanol Diesel engines need multi-fuel high-pressure fuel injection pumps with higher injection pressure and suitable for injecting low-viscosity alternative fuels. [0003] The electronically controlled high-pressure fuel injection systems of existing diese...

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Problems solved by technology

[0009] The purpose of the present invention is to overcome the high-pressure fuel injection pump for diesel engines produced by adopting the original invention of the applicant, the patent No. ZL201110217136.4 "A Sealing and Lubricating Structure for the Plunger of an Ultra-high Pressure Piston Pump". The complex structure of "the lubricating oil chamber communicates with the annular sealing oil groove and the lubricating oil one-way valve through the three-way oil passage respectively" at the lower end makes it difficult to ensure the pressure transmission cylinder hole wall at the connection end of the pressure transmission cylinder and the three-way oil passage. For the problems of processing accuracy and high manufacturing cost, it is necessary to provide a more simple structure, easy to manufacture, easy to ensure processing accuracy, low manufacturing cost, and can still effectively ensure the lubrication and sealing of the plunger. A diesel engine multi-fuel fuel injection pump structure with good fuel, good working reliability and long plunger working life

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