CN211975178U

CN211975178U - Engine combustion chamber and engine combustion system

Info

Publication number: CN211975178U
Application number: CN201922488589.5U
Authority: CN
Inventors: 周鹏; 蔡志勇; 庞斌; 孙振宇
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-11-20
Anticipated expiration: 2029-12-31

Abstract

The utility model relates to an engine technical field, concretely relates to engine combustion chamber and engine combustion system. The utility model discloses an engine combustion chamber includes: the device comprises a cylinder body, a first oil injection pipeline and a second oil injection pipeline; an arc-shaped cavity is formed in the cylinder body, and the first oil injection pipeline and the second oil injection pipeline are arranged along the circumferential direction of the cross section of the arc-shaped cavity; the first oil injection pipeline and the second oil injection pipeline are not level in height. The utility model discloses an among the engine combustion chamber, the circumference setting of the cross section of arc chamber is followed to first oil spout pipeline and second oil spout pipeline, and first oil spout pipeline and second oil spout pipeline reverse jet avoid the homonymy to spray the oil beam alternately. The arc-shaped cavity enables the combustible mixed gas to circularly flow in the cavity, a local concentrated area on the wall surface appears, and the heat load is more uniform. The first oil injection pipeline and the second oil injection pipeline are not parallel and level in height, and the inner surface of the arc-shaped cavity is convenient to process to form a circular motion space.

Description

Engine combustion chamber and engine combustion system

Technical Field

The utility model relates to an engine technical field, concretely relates to engine combustion chamber and engine combustion system.

Background

The fuel injection of the existing opposed GCI (Gasoline direct injection Compression Ignition) engine is generally two nozzles which are arranged in a positive and opposite way, each nozzle is provided with three spray holes which are in opposed cross injection, pits on the top surfaces of an air inlet side piston and an air outlet side piston are in simple elliptical ball shapes, the space of the whole combustion chamber is in a football shape, and the cross injection mode cannot completely avoid the overlapping of oil beams.

Particularly, the GCI engine has high injection pressure and a large oil beam atomization cone angle, and the edges of the oil beams are easy to overlap, so that the oil consumption smoke emission is increased. Under high injection pressure, the penetration distance of the oil beam is large, a large amount of fuel oil is gathered at two ends of the olive-shaped combustion space, so that an oil-gas mixed concentrated region appears at two electrodes, the mixed gas in the middle region is thin, and the spatial distribution of the oil-gas concentration is very uneven. The gradient of the change of the heat load and the flame propagation speed is large, the mixed gas near the oil nozzle is too thick, the heat load is high, and the mixed gas is easy to burn out. The risk of carbon deposition of the piston ring is high, and cylinder scuffing is easily caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the existing engine combustion chamber at least, overlapping and the very inhomogeneous problem of oil gas concentration spatial distribution appear easily at the oil beam edge. The purpose is realized by the following technical scheme:

the utility model discloses a first aspect provides an engine combustion chamber, engine combustion chamber includes: the device comprises a cylinder body, a first oil injection pipeline and a second oil injection pipeline;

an arc-shaped cavity is formed in the cylinder body, and the first oil injection pipeline and the second oil injection pipeline are arranged along the circumferential direction of the cross section of the arc-shaped cavity;

the first oil injection pipeline and the second oil injection pipeline are not level in height.

According to the utility model discloses an among the engine combustion chamber, the circumference setting of the cross section of arc chamber is followed to first oil spout pipeline and second oil spout pipeline, and first oil spout pipeline and second oil spout pipeline reverse jet avoid the homonymy to spray the oil beam alternately. The arc-shaped cavity enables the combustible mixed gas to circularly flow in the cavity, a local concentrated area on the wall surface appears, and the heat load is more uniform. The first oil injection pipeline and the second oil injection pipeline are not parallel and level in height, and the inner surface of the arc-shaped cavity is convenient to process to form a circular motion space.

In addition, according to the utility model discloses an engine combustion chamber still can have following additional technical characterstic:

the utility model discloses an in some embodiments, first oil spout pipeline with adopt a plurality of arcwall faces between the oil spout pipeline of second, the arcwall face is including the first arcwall face, second arcwall face and the third arcwall face that connect gradually, the radius of first arcwall face, second arcwall face and third arcwall face crescent. The utility model discloses an in some embodiments, first oil spout pipeline with oil spout pipeline follows the difference in height in the vertical direction of the cross section in arc chamber is 8.5mm ~ 9.5 mm.

In some embodiments of the present invention, the ratio of the maximum length DX of the cross section of the arc-shaped chamber to the cylinder diameter is 0.7-0.8.

In some embodiments of the present invention, the ratio of the maximum width d0 of the longitudinal section of the arcuate chamber to the maximum width DY of the transverse section of the arcuate chamber is 1.1-1.25.

The utility model also provides an engine combustion system, including above-mentioned engine combustion chamber, still include first nozzle and second nozzle, first nozzle is located in the first oil spout pipeline, the second nozzle is located in the second oil spout pipeline.

In some embodiments of the present invention, the spraying direction of the first nozzle and the spraying direction of the second nozzle are parallel to each other along the cross-sectional direction of the arc-shaped chamber.

In some embodiments of the present invention, the first nozzle and the second nozzle are provided with a plurality of nozzles, and the nozzle is adjacent to the nozzle along the same included angle of the longitudinal section of the arc-shaped cavity.

In some embodiments of the utility model, adjacent the orifice is followed the longitudinal section contained angle of arc chamber is 35 ~ 45.

In some embodiments of the present invention, the nozzle hole has an included angle of 155 to 165 ° with a horizontal line along a cross-section of the arc-shaped chamber.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:

fig. 1 schematically shows a schematic view of a cross-sectional direction of an engine combustion chamber according to an embodiment of the invention;

fig. 2 schematically shows a schematic view of a longitudinal section of an engine combustion chamber according to an embodiment of the invention.

The reference numerals in the drawings denote the following:

1: a cylinder body; 2: a first oil injection line; 3: a second fuel injection line; 4: an arcuate chamber.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

As shown in fig. 1 and 2, fig. 1 is a sectional view of the cylinder block 1, and fig. 2 is a sectional view of the cylinder block 1 after being vertically turned. The engine combustion chamber in the present embodiment includes: the device comprises a cylinder body 1, a first oil injection pipeline 2 and a second oil injection pipeline 3; an arc-shaped cavity 4 is arranged in the cylinder body 1, and the first oil injection pipeline 2 and the second oil injection pipeline 3 are arranged along the circumferential direction of the cross section of the arc-shaped cavity 4; the first oil injection pipeline 2 and the second oil injection pipeline 3 are not level in height.

First oil spout pipeline 2 and second oil spout pipeline 3 along the circumference setting of the cross section of arc chamber 4, and first oil spout pipeline is at oil spout pipeline 2 and the interior reverse injection of second oil spout pipeline 3, avoids the homonymy to spout the oil beam alternately. The arc-shaped cavity 4 enables the combustible mixed gas to circularly flow in the cavity, a local concentrated area on the wall surface appears, and the heat load is more uniform. The first oil injection pipeline 2 and the second oil injection pipeline 3 are not parallel and level in height, and the inner surface of the arc-shaped cavity 4 is convenient to process to form a circular motion space. Two oil spout pipelines of two sides are not avoided the radial motion of opposition piston on same water flat line, and the equilibrium is also stronger. The arc-shaped chamber 4 is in an irregular oval shape.

In some embodiments of the utility model, adopt a plurality of arcwall faces along the cross section direction of arc chamber 4 between first oil spout pipeline 2 and the second oil spout pipeline 3, a plurality of arcwall faces are including the first arcwall face, second arcwall face and the third arcwall face that connect gradually, and the radius of first arcwall face, second arcwall face and third arcwall face is crescent, and r1 is less than r2 and is less than r3 promptly.

The arc-shaped surface is arranged, and compared with the original regular oval concave pit, only one section of arc-shaped surface can better ensure that the fuel has enough rebound and sliding effects after colliding with the wall. The radius of the first arc-shaped surface, the radius of the second arc-shaped surface and the radius of the third arc-shaped surface are gradually increased and matched with the movement characteristics of the oil bundles.

In some embodiments of the present invention, the height difference between the first oil spraying pipeline 2 and the second oil spraying pipeline 3 along the vertical direction of the cross section of the arc-shaped cavity 4 is 8.5mm to 9.5 mm.

An included angle a between the axis of the spray hole and the horizontal direction is matched with the height difference h of the installation positions of the oil sprayers on the two sides, and the a/h is 17-18.5.

In some embodiments of the present invention, the ratio of the maximum length DX of the cross section of the arc-shaped chamber 4 to the diameter of the cylinder body 1 is 0.7-0.8. This design value mainly affects the intensity of the air flow movement in the arc-shaped chamber 4.

In some embodiments of the present invention, the ratio of the maximum width d0 of the longitudinal section of the arcuate chamber 4 to the maximum width DY of the transverse section of the arcuate chamber 4 is 1.1-1.25. The maximum width d0 of the longitudinal section of the arc-shaped chamber 4 is larger than the maximum width DY of the transverse section of the arc-shaped chamber 4, and the oil beam interval angle can be reasonably arranged.

The distance between the two parallel lines is d, Dy/d is 1.15-1.35, and the design value is mainly that enough oil beam diffusion space is available for matching the high ground injection pressure under different working conditions.

In some embodiments of the present invention, the spraying direction of the first nozzle is parallel to the spraying direction of the second nozzle along the cross-sectional direction of the arc-shaped chamber 4.

In some embodiments of the present invention, the first nozzle and the second nozzle are both provided with a plurality of nozzles, and the included angles of a plurality of adjacent nozzles along the longitudinal section of the arc-shaped cavity 4 are the same.

In some embodiments of the present invention, the included angle between the longitudinal section of the adjacent nozzle holes along the arc-shaped cavity 4 is 35-45 °. The number of the spray holes is generally 3, and the oil beam interval angle b is 35-45 degrees.

In some embodiments of the present invention, the nozzle hole has an angle of 155 to 165 ° with the horizontal line along the cross section of the arc chamber 4.

In the engine combustion system of the utility model, the mounting directions of the spray holes of the first nozzle and the second nozzle are opposite, and the first nozzle and the second nozzle on both sides adopt a reverse injection mode to avoid the intersection problem of oil beam injection at the same side; the reverse injection direction improves the air utilization rate of the space in parallel; smooth semi-elliptical circumferentially symmetrical pits are designed, so that sliding movement after fuel injection collides with the wall is facilitated, and oil-gas mixing is enhanced; the design of the elliptical circumferential symmetric combustion space enables the combustible mixed gas to circularly flow in the cavity, a local thick area on the wall surface appears, and the heat load is more uniform; the bilateral nozzles are not on the same horizontal line to avoid radial movement of the opposed pistons, and the balance is stronger.

To sum up, the utility model discloses an in the engine combustion chamber, first oil spout pipeline 2 and second oil spout pipeline 3 along the circumference setting of the cross section of arc chamber 4, first

oil spout pipeline

2 and 3 reverse injection of second oil spout pipeline avoid the homonymy to spray the oil beam alternately. The arc-shaped cavity 4 enables the combustible mixed gas to circularly flow in the cavity, a local concentrated area on the wall surface appears, and the heat load is more uniform. The first oil injection pipeline 2 and the second oil injection pipeline 3 are not parallel and level in height, and the inner surface of the arc-shaped cavity 4 is convenient to process to form a circular motion space.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An engine combustion chamber, comprising: the device comprises a cylinder body, a first oil injection pipeline and a second oil injection pipeline;

2. The engine combustion chamber of claim 1, wherein a plurality of arcuate surfaces are employed between the first fuel injection line and the second fuel injection line, the plurality of arcuate surfaces including a first arcuate surface, a second arcuate surface, and a third arcuate surface that are connected in sequence, and radii of the first arcuate surface, the second arcuate surface, and the third arcuate surface are gradually increased.

3. The engine combustion chamber of claim 1, wherein a difference in height of the first and second injection lines in a vertical direction along a cross-section of the arc-shaped chamber is 8.5mm to 9.5 mm.

4. The engine combustion chamber of claim 1 wherein the ratio of the maximum length DX of the transverse plane of the arcuate chamber to the block diameter is 0.7-0.8.

5. The engine combustion chamber as set forth in claim 1 wherein the ratio of the maximum width d0 of the longitudinal section of the arcuate chamber to the maximum width DY of the transverse section of the arcuate chamber is between 1.1 and 1.25.

6. An engine combustion system comprising the engine combustion chamber of any one of claims 1 to 5, further comprising a first injector and a second injector, the first injector being disposed in the first injection line, the second injector being disposed in the second injection line.

7. The engine combustion system of claim 6, wherein the injection direction of the first nozzle and the injection direction of the second nozzle are parallel in the cross-sectional direction of the arcuate chamber.

8. The engine combustion system of claim 6, wherein a plurality of orifices are disposed in each of the first nozzle and the second nozzle, and wherein the angles of adjacent orifices along a longitudinal section of the arcuate chamber are the same.

9. The engine combustion system of claim 8, wherein the included angle between adjacent nozzle holes along the longitudinal section of the arc-shaped cavity is 35-45 degrees.

10. The engine combustion system of claim 8, wherein the angle between the nozzle hole and a horizontal line along a cross-section of the arcuate chamber is 155-165 °.