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Plunger type twice fuel injection pump

A fuel injection pump and plunger type technology, which is applied in the field of plunger type double fuel injection pumps, can solve the problems of high soot NOX emission, inability to achieve double fuel injection, restrictions and the like

Inactive Publication Date: 2013-06-05
GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] Diesel engine (CI) adopts a larger compression ratio (ε=16~22), and its thermal efficiency is higher than that of gasoline engine, but its soot and NOX emissions are higher. The problem of emission reduction has always been the development of diesel engine (especially small diesel engine with simple structure). Due to technical difficulties, in order to meet the emission regulations, some models adopt the method of moderately reducing the output power and thermal efficiency to ease the emission reduction targets
Small diesel engines use plunger fuel injection pumps to supply fuel, and the existing plunger fuel injection pumps cannot achieve two fuel injections. These reasons limit the promotion of diesel HCII clean combustion technology. The oil pump is the key to popularize diesel HCII clean combustion technology

Method used

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  • Plunger type twice fuel injection pump
  • Plunger type twice fuel injection pump
  • Plunger type twice fuel injection pump

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Embodiment Construction

[0024] refer to figure 1 , figure 2 , the plunger-type double fuel injection pump provided by the present invention is composed of a plunger sleeve 1, a plunger 12 and a drive cam 10, wherein the plunger sleeve 1 has an oil inlet 13, a return oil outlet 4, a spring Valve 3 and high-pressure oil outlet 2; plunger 12 has two fuel injection working sections, among the two fuel injection working sections, the first fuel injection working section has the first oil supply edge 16 and the first oil stop edge 17 and the first section of helical oil groove 14, the second section of the oil injection working section has the second section of oil supply edge 18, the second section of oil stop edge 19 and the second section of helical oil groove 20, the first section of helical oil groove 14 and the second section The spiral oil grooves 20 are respectively communicated with the central oil hole 15 at the top of the plunger 12; there are two lift profiles in the driving cam 10, wherein, ...

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Abstract

A plunger type twice fuel injection pump comprises a plunger (12) matched with a plunger sleeve (1) and provided with two fuel injection operation sections and a two-section lifting outline section and a drive cam (10). The drive cam rotates for a circle so that the plunger is pushed to achieve primary fuel injection for premixing before engine exhaust emission and the plunger is pushed for a second time to achieve secondary fuel injection for ignition before a compressing top dead center. According to the plunger type twice fuel injection pump, clean combustion of diesel oil is achieved so that soot emission is reduced by 63%, non-soot emission is even achieved, nitrogen oxide emission is reduced greatly as well and output power and thermal efficiency of the engine are respectively improved at a certain degree.

Description

[0001] technical field [0002] The invention relates to a diesel engine fuel injection pump, in particular to a plunger type double fuel injection pump used for HCII four-stroke diesel engines. Background technique [0003] Diesel engine (CI) adopts a larger compression ratio (ε=16~22), and its thermal efficiency is higher than that of gasoline engine, but its soot and NOX emissions are higher. The problem of emission reduction has always been the development of diesel engine (especially small diesel engine with simple structure). Due to technical difficulties, in order to meet the emission regulations, some models have moderately reduced the output power and thermal efficiency to ease the emission reduction targets. The fuel injection pressure and the quality of oil droplet atomization of diesel engines are important indicators to determine the emission characteristics of diesel engines. The fuel injection pressure used by modern advanced vehicle diesel engines has reached...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M59/02
Inventor 邓飞中
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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