Piston top surface structure for reducing soot in diesel engine cylinder

A piston crown and diesel engine technology, applied to internal combustion piston engines, pistons, mechanical equipment, etc., can solve the problem that the oil-gas mixing state of the combustion chamber pit cannot be completely changed, so as to improve the oxidation rate of soot and reduce the emission of soot in the cylinder , Improve the effect of oil-gas mixing state

Inactive Publication Date: 2018-10-19
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent document 2CN105909420A discloses a combustion chamber for reducing soot in a diesel engine cylinder. In addition to optimizing the shape of the ω-shaped combustion chamber cavity in the center of the top surface, the combustion chamber also adds an annular guide surface on the edge, which can prevent the Part of the mixed gas directly enters the low-temperature anoxic area close to the cylinder wall, which plays a certain role in reducing the soot outside the pit, but this patent cannot completely change the oil-gas mixing state outside the pit of the combustion chamber

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  • Piston top surface structure for reducing soot in diesel engine cylinder
  • Piston top surface structure for reducing soot in diesel engine cylinder
  • Piston top surface structure for reducing soot in diesel engine cylinder

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Embodiment 1

[0024] Such as figure 1 and figure 2 As shown, a kind of piston top surface structure that reduces soot in the diesel engine cylinder of the present invention is to dig a soot oxidation annular groove 3 whose cross-sectional shape is an inverted trapezoid on the piston top surface 2, and the inverted trapezoidal soot oxidation annular groove 3 The included angles between the two waistlines, i.e., the discharge slope 4 and the flow blocking wall 6, and the piston top surface 2 are α 1 =30~70°, β 1 =30~70, the ring groove bottom 5 is connected smoothly with the discharge slope 4 and the flow blocking wall 6, the distance H between the ring groove bottom 5 and the piston top surface 2 1 The soot oxidation ring groove 3 is coaxial with the combustion chamber 1, and its upper top surface is a part of the piston top surface 2, and its radial position is formed by the intersection of the highest point of the combustion chamber 1 and the piston top surface 2 circle (diameter D 1 ...

Embodiment 2

[0026] Such as figure 1 and image 3 As shown, a piston top surface structure for reducing soot in a diesel engine cylinder of the present invention is to dig a soot oxidation annular groove 3 with a cross-sectional shape that is a left-right symmetrical arc on the piston top 2, and the left-right symmetrical arc soot oxidation The angle between the discharge slope 4 of the ring groove 3 and the piston top surface 2 is α 2 =30~70°, the included angle between the blocking wall 6 of the soot oxidation ring groove 3 and the piston top surface 2 is β 2 =30~70°, the ring groove bottom 5 is smoothly transitioned to the discharge slope 4 and the blocking wall 6, and the distance H between the ring groove bottom 5 and the piston top surface 2 2 The soot oxidation ring groove 3 is coaxial with the combustion chamber 1, and its upper top surface is a part of the piston top surface 2, and its radial position is formed by the intersection of the highest point of the combustion chamber 1...

Embodiment 3

[0028] Such as figure 1 and Figure 4 As shown, a piston top surface structure for reducing soot in the diesel engine cylinder of the present invention is to dig a soot oxidation annular groove 3 with a cross-sectional shape that is shallow on the left and deep on the right and deep on the piston top surface. The included angle between the discharge slope 4 of the deep asymmetric arc-shaped soot oxidation ring groove 3 and the piston top surface 2 is α 3 =10~40°, the included angle between the blocking wall 6 of the soot oxidation ring groove 3 and the piston top surface 2 is β 3 =60~90°, the ring groove bottom 5 is smoothly connected with the discharge slope 4 and the flow blocking wall 6, the distance H between the ring groove bottom 5 and the piston top surface 2 3 The soot oxidation ring groove 3 is coaxial with the combustion chamber 1, and its upper top surface is a part of the piston top surface 2, and its radial position is formed by the intersection of the highest p...

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Abstract

The invention discloses a piston top surface structure for reducing soot in a diesel engine cylinder. The structure comprises a piston top surface of a combustion chamber, characterized in that: the piston top surface is provided with a soot oxidation annular groove, the soot oxidation annular groove is coaxial with the combustion chamber, the radial position is between a circle having a diameterD1 and a maximum outer circle having a diameter D2 of the piston top surface, wherein the circle having a diameter D1 is formed by intersecting the highest point of the combustion chamber with the piston top surface. The piston top surface structure has the beneficial effects that the soot oxidation annular groove can increase the amount of fresh air at the piston top, increase the soot oxidationrate in the region, and allow more soot to be oxidized in the soot oxidation annular groove, thereby reducing the soot emissions in the diesel engine cylinder. Compared with a flat-top piston diesel engine of the same combustion chamber, the diesel engine with such a top surface structure reduces the in-cylinder soot emissions by 85.6%.

Description

technical field [0001] The patent of the invention belongs to the field of diesel engine combustion, and in particular relates to a piston top surface structure for reducing soot in a diesel engine cylinder. Background technique [0002] The main pollutant emissions of diesel engines are soot and nitrogen oxides, among which the soot emitted by diesel engines is considered to be one of the main reasons for the aggravation of smog in recent years. In order to solve this problem, the National VI emission regulations set very strict limits on the soot emission of diesel vehicles. Since most of the national VI technical solutions introduce exhaust gas recirculation (EGR) technology to reduce nitrogen oxides, its side effect is to further increase the soot emission in the cylinder. In addition, the particulate filter (DPF) used in the National VI technical solution needs to consume fuel for regeneration. The greater the soot emission in the cylinder, the more frequent the regene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02F3/26F02F3/24
CPCF02F3/24F02F3/26F02B23/0684Y02T10/12
Inventor 赵伟金华玉胡芳陈长军包宁胡志林孟令军
Owner CHINA FIRST AUTOMOBILE
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