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Fuel injection pump having cavitation damage-prevention structure

A technology of a fuel injection pump and a protective structure, which is applied in the field of combustion of gas turbines, can solve problems such as failure to clarify the cause of damage, failure to reliably estimate and evaluate, etc.

Active Publication Date: 2007-12-12
HYUNDAI HEAVY IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because these methods only rely on the experience of various injuries, but have not clarified the cause of the injury, there is a problem of no reliable evaluation

Method used

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  • Fuel injection pump having cavitation damage-prevention structure
  • Fuel injection pump having cavitation damage-prevention structure
  • Fuel injection pump having cavitation damage-prevention structure

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0033] 5 is a cross-sectional view showing the structure of the fuel injection pump according to the first embodiment of the present invention. Referring to FIG. 5 , the fuel injection pump according to the first embodiment of the present invention is characterized by an improved structure of the deflector 110 for preventing the pump barrel 100 from being discharged to the pump at high speed and high pressure just after the effective stroke of the fuel injection pump. The oil return hole 120 is damaged due to residual fuel. The fuel injection pump having the above features can prevent the injection cavitation 20 that occurs just after the effective stroke of the fuel injection pump from directly impacting the oil return hole 120 . Also, the structure of the fuel injection pump makes it possible to prevent a pressure wave generated when cavitation strikes the oil return hole from propagating to the cavitation around the plunger 130 .

[0034] FIG. 6 is a view showing the struc...

no. 2 approach

[0040] 8 is a cross-sectional view showing the structure of a fuel injection pump according to a second embodiment of the present invention. 8, the fuel injection pump according to the second embodiment of the present invention is characterized by a modified shape of the oil return hole 210 defined in the pump barrel 200 for discharging residual fuel after the effective stroke of the fuel injection pump . The fuel injection pump having the above-described characteristics is due to the increased distance from the position at which the injection cavitation 20 occurs just after the effective stroke of the fuel injection pump to the position at which the injection cavitation impinges on the side of the oil return hole 210 . The structure makes the intensity of cavitation weaker and prevents pressure waves from propagating to the plunger 220 .

[0041] FIG. 9 shows the shape of the oil return hole 210 in detail. Referring to FIG. 9 , the shape of the oil return hole 210 is design...

no. 3 approach

[0047] 11 is a cross-sectional view showing the structure of a fuel injection pump according to a third embodiment of the present invention. 11 , the fuel injection pump according to the third embodiment of the present invention is characterized by an improved structure of the deflector 310 and the oil return hole 320 . The structure of the fuel injection pump having the above-mentioned features is such that the injection cavitation 20 that occurs just after the effective stroke of the fuel injection pump passes through the space defined between the deflector 310 and the side surface of the oil return hole 320, and even if it is caused by the injection The cavitation phenomenon 20 impacts the deflector to generate pressure waves, which can also prevent the pressure waves from propagating to the plunger 330 .

[0048] FIG. 12 shows the structure of the deflector 310 and the oil return hole 320 in detail. Referring to FIG. 12 , the deflector 310 includes a first tapered portion...

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PUM

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Abstract

Disclosed herein is a fuel injection pump having cavitation damage -prevention structure, in which the structure and shape of a deflector (110) and a spill port (120) are improved, thus preventing the spill port and plunger (130) from being damaged due to cavitation. To achieve the above-mentioned purpose, the fuel injection pump of the present invention includes a means for preventing propagation of pressure waves. The propagation preventing means is provided on at least one of the spill port (120) and the deflector (110) such that pressure waves, which are generated when a jet-type cavitation, occurring just after the spill port (120) is opened strikes the spill port (120) or the deflector (110), are prevented from being propagated to cavities that remain around a side surface of the plunger (130).

Description

technical field [0001] The present invention generally relates to compressing fuel at high pressure and supplying the fuel to injectors to operate a fuel injection pump of a direct injection internal combustion engine, and more particularly to a fuel injection pump having improved cavitation damage Protective structure to solve the problem of damage to pump elements due to cavitation, and problems caused by the tendency of fuel injection pressure to increase. Background technique [0002] As is well known to those skilled in the art, an internal combustion engine is a mechanical device that converts thermal energy generated by mixing and burning fuel and air drawn into the machine into mechanical energy. Meanwhile, according to the fuel supply method, diesel engines can be classified into direct injection engines, pre-combustion chamber engines, swirl chamber engines, and air chamber engines. A direct injection engine adopts a method of injecting fuel directly into a combus...

Claims

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Application Information

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IPC IPC(8): F02M59/26
CPCF02M59/265F02M59/44F02M2200/04
Inventor 金东勋葛相学河芝洙金柱泰
Owner HYUNDAI HEAVY IND CO LTD
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