Dual-fuel ejector and engine

Abstract

The invention relates to the field of engines, and discloses a dual-fuel ejector and an engine. The dual-fuel ejector comprises a main body, a fuel control assembly and a gas control assembly. The main body is provided with a main oil passage and a main gas passage. The fuel control assembly is disposed on the main body and used for controlling the on-off state of the main oil passage to control oil injection. The gas control assembly comprises a main chamber formed in the main body and a gas injection valve element movably arranged in the main chamber. The gas injection valve element dividesthe main chamber into a gas cavity and a hydraulic cavity which are independent of each other. The hydraulic cavity communicates with a hydraulic oil passage formed in the main body, and the gas cavity is connected to the main gas passage in series. When gas pressure in the gas cavity pushes the gas injection valve element to move towards one end of the hydraulic cavity, a gas outlet of the gas cavity is opened. When high-pressure oil in the hydraulic cavity pushes the gas injection valve element to move towards one end of the gas cavity, the gas outlet of the gas cavity is closed to control gas injection. The dual-fuel ejector is simple in structure, small in size and capable of achieving quick closing of a gas injection channel and improving the control precision of gas injection.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a dual fuel injector and an engine. Background technique [0002] In the context of the shortage of traditional petroleum energy, the mature application of natural gas provides a good choice for solving the short-term energy and environmental pollution problems faced by the development of fuel-powered engines. Therefore, the dual-fuel engine came into being. [0003] The dual-fuel injector of the dual-fuel engine is its core component, and the structure of the dual-fuel injector, fuel and gas control structure directly affect the performance and design cost of the dual-fuel engine. At present, there are many types of dual-fuel injectors, which can generally switch between fuel and gas working modes. The existing problems mainly include: 1. The switch control of the jet channel of dual-fuel injectors mostly adopts a one-way valve type with a compression spring. Structure, the va...

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Problems solved by technology

At present, there are many types of dual-fuel injectors, which can generally switch between fuel and gas operating modes. The existing problems mainly include: 1. The switch control of the jet channel of the dual-fuel injector mostly adopts a one-way valve type with a compression spring. structure, the valve needle realizes the normally closed of the jet channel under the elastic force of the compression spring

When the jet channel is turned from open to closed, due to the slow elastic return speed of the compression spring, the closing speed of the valve needle of the jet channel is delayed slowly, and it is difficult to realize the rapid and precise control of the jet; 2. The split structure is adopted, The volume is large, the structure of the original engine needs to be greatly changed, and the design cost is high; 3. The structure of the dual-fuel injector is complex, the manufacture is difficult, and the actual use value is low

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