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Fuel injector for coaxial injection of natural gas and diesel fuel and its control method

A fuel injector, natural gas technology, applied in the direction of engine control, combustion engine, machine/engine, etc., can solve the problems of aging elasticity and insufficient return spring, achieve the effect of prolonging the service life, solving the lack of elasticity, and simplifying the complexity

Active Publication Date: 2022-07-22
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: The purpose of the invention is to solve the problem of lack of elastic force caused by the aging of the return spring after long-term use of the coaxial injector in the prior art, and propose a fuel injector and its control method for coaxial injection of natural gas and diesel dual fuel

Method used

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  • Fuel injector for coaxial injection of natural gas and diesel fuel and its control method
  • Fuel injector for coaxial injection of natural gas and diesel fuel and its control method
  • Fuel injector for coaxial injection of natural gas and diesel fuel and its control method

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Effect test

Embodiment 1

[0036] like figure 1 As shown, a fuel injector for coaxial injection of natural gas and diesel fuel includes a valve body 1, a valve core 2 and a valve sleeve 3, and the valve core 2 and the valve sleeve 3 are coaxially installed in the valve body 1; It is characterized in that: the valve sleeve 3 divides the inside of the valve body 1 into a pressure chamber 4, a natural gas cavity 5 and a diesel cavity 6, and the valve body 1 is provided with a common nozzle 11 communicating with the pressure chamber 4, and the natural gas cavity. 5. The natural gas inlet channel 12 communicated with the diesel cavity 6, the first diesel oil inlet channel 13 and the first diesel oil return channel 14 communicated with the diesel cavity 6; the top of the valve core 2 and the inner wall of the valve body 1 form a pressure control cavity 7, The valve body 1 is provided with a second diesel oil inlet channel 15 and a second diesel oil return channel 16 that communicate with the pressure control ...

Embodiment 2

[0049] like Image 6 As shown, in order for the pressure control cavity 7 to provide a thrust continuously acting on the upper valve core 21 , a second return spring 71 is provided in the pressure control cavity 7 , and the two ends of the second return spring 71 are respectively connected to the inner wall of the valve body 1 . The upper top is in contact with the upper top of the upper valve core 21, and the second return spring 71 is a compression spring.

Embodiment 3

[0051] like Figure 7 As shown, in order to improve the sealing performance and reliability of the natural gas cavity, the natural gas cavity 5 is provided with a third return spring 51. The bottom surface is fixedly connected, and the third return spring 51 is a tension spring.

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Abstract

The invention discloses a fuel injector for coaxial injection of natural gas and diesel fuel and a control method thereof. The fuel injector comprises a valve body, a valve core and a valve sleeve. Diesel cavity and pressure control cavity, the valve body is provided with a common nozzle hole, a natural gas inlet channel, a first diesel oil inlet and oil return channel, and a diesel second oil inlet and oil return channel; The oil return passage is respectively provided with a first solenoid valve and a second solenoid valve; respectively, by controlling the first and second solenoid valves, the diesel injection mode, the natural gas injection mode and the injector closing mode are realized. Beneficial effects: the common injection hole of the present invention simplifies the structure of the injector; the pressure control cavity simplifies the complexity of the injection device, controls the fuel injector through oil pressure, reduces the number of return springs used, and solves the problem of the return spring after long-term use. Aging creates a problem of insufficient elasticity, extending the life of the fuel injector.

Description

technical field [0001] The invention relates to an internal combustion engine fuel injector and a control method thereof, in particular to a fuel injector capable of realizing coaxial injection of natural gas and diesel fuel dual fuel and a control method thereof, belonging to the technical field of internal combustion engine fuel injectors. Background technique [0002] At present, the field of internal combustion engine combustion is pursuing two goals of high thermal efficiency and low emissions. In order to achieve these two goals, people have proposed advanced injection strategies (such as RCCI injection methods) and the use of clean energy (such as natural gas) as an alternative fuel method. Natural gas is abundant in my country, and with the continuous advancement of China's energy supply side reform, the status of natural gas in my country's energy structure continues to rise, and it has broad application prospects. [0003] Traditional fuel injectors are mostly sing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D19/06
CPCF02D19/0605F02D19/0647F02D19/0678Y02T10/30
Inventor 曹礼轩王谦张宇宽姜鹏刘旭
Owner JIANGSU UNIV
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