Isobaric fuel injection pump of high-speed machine

A technology of fuel injection pump and high-speed engine, which is applied in the field of marine engines, can solve the problems of large space occupied by the ring gear and rack mechanism, large mass of moving parts, and high manufacturing cost, and achieve the effect of small moving mass, low processing difficulty, and compact structure

Active Publication Date: 2021-03-19
CHONGQING HONGJIANG MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the gear and rack mechanism takes up a lot of space and weakens the pump body greatly. The quality of the moving parts is relatively large when the guide piston assembly is used, and the manufacturing cost is relatively high when the anti-corrosion screw is used to prevent cavitation.

Method used

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  • Isobaric fuel injection pump of high-speed machine
  • Isobaric fuel injection pump of high-speed machine
  • Isobaric fuel injection pump of high-speed machine

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Embodiment Construction

[0044] refer to Figure 1 to Figure 6 , the embodiment of the present invention provides a new type of constant pressure fuel injection pump for high-speed machines, which specifically includes an equal pressure oil outlet valve assembly 2, a plunger coupling 3, and a pump body 5, which are assembled in the middle hole of the pump body 5 from top to bottom. Big spring 7 , small spring 8 , lower spring seat 9 , lower spring plate 10 , lower body 13 , control sleeve 11 assembled on lower body 13 , lever 12 and guide cylinder assembly 14 assembled in the middle hole of lower body 3 .

[0045] Such as figure 1 As mentioned above, the plunger coupler 3 is suspended and installed in the middle hole of the pump body 5, and the equal pressure oil outlet valve assembly 2 is installed on the upper end of the plunger coupler 3, and is locked with the pump body 5 by six powerful screws 1, and the pump body 5 A low-pressure fuel chamber 51, a lubricating oil return chamber 52, and a lubri...

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Abstract

The invention relates to an isobaric fuel injection pump of a high-speed machine, which adopts an isobaric oil outlet valve structure to avoid secondary injection of a nozzle. An oil outlet valve baseadopts a split type and is compact in structure; an oil adjustment mechanism adopts a control sleeve to drive a deflector rod matched with the tail of a plunger so as to drive the plunger to rotate to adjust the effective stroke of pressurization oil supply; compared with a traditional gear ring and rack mechanism, the structure is compact, weakening of a pump body is small, the machining difficulty is low, a transmission part adopts a guide cylinder assembly, the motion mass is small, plunger springs adopt a double-spring parallel connection mode with opposite rotating directions, the structure is compact, continuous tracking between a transmission part and a cam is guaranteed through a large spring, a small spring guarantees that the plunger rapidly descends to flush oil for the next cycle after running to the top dead center, an anti-corrosion check block installed on the inner wall of a low-pressure cavity of the pump body is used for preventing cavitation, the structure is simple, and the machining difficulty is low.

Description

technical field [0001] The invention relates to a mechanical fuel injection pump, in particular to a constant pressure fuel injection pump for a high-speed machine, and belongs to the technical field of marine engines. Background technique [0002] The fuel injection pump, also known as the high-pressure fuel pump, is the most important part of the fuel injection system and is a key part of the diesel engine. The function of the fuel injection pump is to increase the fuel pressure, and according to the needs of the diesel engine, a certain amount of fuel is sprayed into the combustion chamber through the nozzle in the form of mist within an accurate time, forming a good mixed gas with the air to ensure high-efficiency combustion needs. With the increasingly stringent emission regulations, fuel injection systems are developing towards intelligence and digitalization, but in the field of marine engine technology, mechanical fuel injection systems still occupy an irreplaceable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M59/10F02M59/20F02M59/44F02M59/46
CPCF02M59/10F02M59/20F02M59/44F02M59/462
Inventor 龚元华陈廷博黄威彭琦扈爽徐伟
Owner CHONGQING HONGJIANG MACHINERY
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