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Inhibition method of cylinder oil accumulation in scavenging ports of marine low-speed machine

A technology of scavenging port and low-speed engine, which is applied in the field of suppression of cylinder oil accumulation at the scavenging port of marine low-speed engine, which can solve high mechanical load and thermal load of engine components, early combustion of gas-air premixed gas in cylinder, engine safety hazards, etc. problem, to achieve the effect of reducing the possibility of pre-ignition, reducing PM emissions, and improving the performance of the main engine

Active Publication Date: 2019-05-24
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the free cylinder oil in the cylinder spontaneously ignites before spark ignition or micro injection ignition, it will cause the gas-air premixed gas in the cylinder to ignite prematurely, which will cause the pressure in the cylinder to rise sharply, the maximum explosion pressure in the cylinder will be too high, and the heat release will be too high. Fast, the resulting mechanical and thermal loads on the engine components are too high, thus posing a safety hazard to the engine

Method used

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  • Inhibition method of cylinder oil accumulation in scavenging ports of marine low-speed machine
  • Inhibition method of cylinder oil accumulation in scavenging ports of marine low-speed machine
  • Inhibition method of cylinder oil accumulation in scavenging ports of marine low-speed machine

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Embodiment 1

[0058] Embodiment 1 (short oil passage)

[0059] Such as figure 1 , Figure 4 , Figure 6 to Figure 9 As shown, the present invention provides a method for inhibiting cylinder oil accumulation at the scavenging port of a marine low-speed engine. An oil passage 4 is arranged on the cylinder wall 1 inside the cylinder to avoid the accumulation of lubricating oil along the cylinder at the scavenging port of a low-speed two-stroke marine engine. .

[0060] The oil passage 4 includes a plurality of oil storage grooves 41 processed in the circumferential direction of the cylinder wall 1; the oil passage 4 starts from the inner side of the cylinder wall 1 and is formed by extending along the radial direction of the cylinder to the outside of the cylinder; The circumferential direction of the cylinder wall 1 is evenly distributed with scavenging ports 5, and each oil storage tank 41 is correspondingly processed on the upper edge 2 of the scavenging port of the scavenging port 5, an...

Embodiment 2

[0066] Compared with Embodiment 1, the present embodiment differs only in that, in this example, the obtuse angle α=110°, the acute angle β=70°, and the grooves along the upper surface and the lower surface toward the inside of the cylinder wall are 2mm deep.

[0067] The width of the oil passage 4 is 2 mm, and the distance between the oil passage 4 and the outer contour of the scavenging port 5 is 2 mm.

[0068] The width of the oil passage 4 and the distance between the oil passage 4 and the outer contour of the scavenging port 5 are L, the length of the major axis of the scavenging port is H, and L=0.02H.

Embodiment 3

[0069] Embodiment 3 (long oil passage)

[0070] Such as figure 1 , image 3 , Figure 5 to Figure 9 As shown, the present invention provides a method for inhibiting cylinder oil accumulation at the scavenging port of a marine low-speed engine. An oil passage 4 is arranged on the cylinder wall 1 inside the cylinder to avoid the accumulation of lubricating oil along the cylinder at the scavenging port of a low-speed two-stroke marine engine. .

[0071] The oil passage 4 includes a plurality of oil storage grooves 41 processed in the circumferential direction of the cylinder wall 1; the oil passage 4 starts from the inner side of the cylinder wall 1 and is formed by extending along the radial direction of the cylinder to the outside of the cylinder; The circumferential direction of the cylinder wall 1 is evenly distributed with scavenging ports 5, and each oil storage tank 41 is correspondingly processed on the upper edge 2 of the scavenging port of the scavenging port 5, and ...

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Abstract

The invention provides an inhibition method of cylinder oil accumulation in scavenging ports of a marine low-speed machine An oil passage is formed in a cylinder wall inside a cylinder; the oil passage comprises a plurality of oil storage grooves processed in the circumferential direction of the cylinder wall; the oil passage is processed in the mode of inclining in the radial direction of the cylinder from the inner side of the cylinder wall and extending out of the cylinder; and the circumferential direction of the cylinder wall is uniformly distributed with the scavenging ports, and each oil storage groove is processed in the upper part of the upper edge of the corresponding scavenging port. According to the inhibition method of cylinder oil accumulation in the scavenging ports of the marine low-speed machine, the oil passage is mainly formed in the cylinder wall inside the cylinder, thus cylinder oil accumulation in the upper edges of the scavenging ports is inhibited, through inhibition, cylinder oil near the scavenging ports is stripped under the action of scavenging air blowing and enters the cylinder in a free state, and then cylinder oil spontaneous combustion in the low-speed two stroke marine engine cylinder is controlled from the source.

Description

technical field [0001] The invention relates to the technical field of cylinder oil spontaneous combustion control, in particular to a method for suppressing accumulation of cylinder oil at a scavenging port of a marine low-speed engine. Background technique [0002] Under the wave of global environmental protection, the issue of ship engine emissions has always been the focus of attention. Gas fueled marine engines do not require exhaust aftertreatment to meet IMO Tier 3 emissions regulations. [0003] In recent years, due to the adoption of advanced technologies such as lean combustion, Miller cycle, and two-stage turbocharging, the thermal efficiency and mean effective pressure of gas fuel engines have been significantly improved, but at the same time, the frequent occurrence of deflagration has also become an obstacle to further improve the performance of the main engine. obstacle. [0004] Among the many factors that cause deflagration, the spontaneous combustion of c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02F1/20F02F1/22
CPCF02F1/20F02F1/22F01M11/02F16N2210/06F01M3/00F01M3/04Y02T10/12
Inventor 冯立岩潘敏龚震于正然孙洪杰闫鹏王自鑫刘强
Owner DALIAN UNIV OF TECH
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