CN213235302U

CN213235302U - Oil sprayer, diesel engine and vehicle

Info

Publication number: CN213235302U
Application number: CN202022040763.2U
Authority: CN
Inventors: 孙振宇; 庞斌; 周鹏; 沈健
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2020-09-17
Filing date: 2020-09-17
Publication date: 2021-05-18
Anticipated expiration: 2030-09-17

Abstract

The utility model discloses a sprayer, diesel engine and vehicle relates to vehicle technical field. The fuel injector is used for injecting fuel bundles to a combustion chamber and comprises a fuel injector body and a nozzle connected with the fuel injector body, wherein the nozzle is eccentrically arranged relative to the combustion chamber and comprises a plurality of spray holes arranged at intervals, and the spray holes are distributed along the circumferential direction of the nozzle; the diameter of the injection hole close to the wall surface of the combustion chamber is smaller than that of the injection hole far away from the wall surface of the combustion chamber. The fuel injector is provided with a plurality of spray holes which are circumferentially arranged at intervals, the diameter of the spray hole close to the wall surface of the combustion chamber is smaller than that of the spray hole far away from the wall surface of the combustion chamber, oil beams sprayed from the spray holes close to the wall surface of the combustion chamber can be reduced and sprayed to the surface of a cylinder sleeve of the cylinder, flame quenching can be reduced, and HC emission is reduced.

Description

Oil sprayer, diesel engine and vehicle

Technical Field

The utility model relates to the technical field of vehicles, especially, relate to a sprayer, diesel engine and vehicle.

Background

With the rising of fuel price, people begin to pay more and more attention to the energy conservation and emission reduction of engines in the competition of vehicle power systems. Two-valve diesel engines are currently widely used in automotive and non-road products and will continue to function for a considerable period of time. At present, under the influence of an air passage arrangement form, fuel injectors of a two-valve diesel engine are obliquely arranged, and a combustion chamber is eccentrically arranged. This arrangement results in inconsistent distances from each orifice to the liner. Spray hole oil beams close to the cylinder sleeve are easy to spray on the surface of the cylinder sleeve, flame quenching is caused, combustion is not good, and a large amount of Hydrocarbon (HC) is generated.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a sprayer, diesel engine and vehicle can improve the in-cylinder burning, and reduce oil consumption and HC discharge.

To achieve the purpose, the utility model adopts the following technical proposal:

a fuel injector is used for injecting a fuel bundle to a combustion chamber and comprises a fuel injector body and a nozzle connected with the fuel injector body, wherein the nozzle is eccentrically arranged relative to the combustion chamber, the nozzle comprises a plurality of spray holes arranged at intervals, and the spray holes are distributed along the circumferential direction of the nozzle; the diameter of the injection hole close to the combustion chamber wall surface is smaller than the diameter of the injection hole far away from the combustion chamber wall surface.

Alternatively, the diameters of the injection holes at the same distance from the combustion chamber wall surface are the same.

Optionally, the positions of the plurality of spray holes in the circumferential direction of the nozzle are symmetrical with respect to a section of the nozzle along the length direction of the nozzle.

Optionally, the axis of the nozzle is arranged at an angle to the centre line of the combustion chamber floor.

Optionally, the flow rate of the orifice is proportional to the area swept by the oil jet.

Alternatively, the intersection points of the central lines of the oil bundles injected from the respective injection holes and the wall surface of the combustion chamber are located on the same contour line.

Optionally, the number of the spray holes is 5-10.

Optionally, the cross-section of the nozzle hole is circular.

A diesel engine comprises the fuel injector.

A vehicle comprises the diesel engine.

The utility model has the advantages that: the utility model provides a sprayer is provided with a plurality of circumference interval arrangements's orifice, and the diameter that is close to the orifice of combustion chamber wall is less than the diameter of the orifice of keeping away from the combustion chamber wall, can reduce to spout cylinder liner surface apart from the nearer orifice spun beam of oil of combustion chamber wall, can reduce flame quenching, reduces HC and discharges.

Drawings

FIG. 1 is a schematic structural diagram of a fuel injector jet bundle provided by an embodiment of the present invention;

fig. 2 is a schematic view of a first perspective structure of a fuel injector nozzle provided by an embodiment of the present invention;

fig. 3 is a schematic diagram of a second perspective structure of a fuel injector nozzle according to an embodiment of the present invention.

In the figure:

1-oil beam;

2-a nozzle; 21-spraying holes; 211-a first orifice; 212-a second nozzle hole; 213-third nozzle hole; 214-fourth nozzle hole; 215-fifth jet orifice; 216-sixth orifice;

3-combustion chamber.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solutions adopted by the present invention and the technical effects achieved by the present invention clearer, the following will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical solution of the present invention will be further explained by the following embodiments with reference to the accompanying drawings.

As shown in fig. 1-3, the fuel injector is used for injecting a fuel bundle 1 to a combustion chamber 3, and comprises a fuel injector body and a nozzle 2 connected with the fuel injector body, wherein the nozzle 2 is eccentrically arranged relative to the combustion chamber 3, the nozzle 2 comprises a plurality of spray holes 21 arranged at intervals, and the plurality of spray holes 21 are distributed along the circumferential direction of the nozzle 2; the diameter of the injection hole 21 close to the wall surface of the combustion chamber 3 is smaller than the diameter of the injection hole 21 far from the wall surface of the combustion chamber 3. It can be understood that the injector is provided with a plurality of injection holes 21 which are arranged at intervals in the circumferential direction, the diameter of the injection hole 21 close to the wall surface of the combustion chamber 3 is smaller than that of the injection hole 21 far away from the wall surface of the combustion chamber 3, the oil beam 1 injected from the injection hole 21 close to the wall surface of the combustion chamber 3 can be reduced to be injected to the surface of a cylinder sleeve, flame quenching can be reduced, and HC emission can be reduced.

Alternatively, the axis of the nozzle 2 is angled with respect to the centerline of the bottom surface of the combustion chamber 3. It will be appreciated that the nozzle 2 is arranged eccentrically with respect to the combustion chamber 3, and the axis of the nozzle 2 is arranged at an angle to the centre line of the bottom surface of the combustion chamber 3, which will result in non-uniform distances from the nozzle holes 21 to the wall surface of the combustion chamber 3. By setting the hole diameter of the injection hole 21, the oil beam 1 injected from the injection hole 21 close to the wall surface of the combustion chamber 3 can be prevented from being injected to the surface of the cylinder liner, flame quenching can be reduced, and HC emission can be reduced.

Optionally, the number of orifices 21 is 5-10. Specifically, the cross section of the nozzle hole 21 is circular. In this embodiment, as shown in fig. 1, the number of the injection holes 21 is 6. In other embodiments, the number of the injection holes 21 may be 7, 8, or the like, and the shape of the injection holes 21 may be adaptively selected.

Alternatively, the diameters of the injection holes 21 at the same distance from the wall surface of the combustion chamber 3 are the same. It can be understood that making the diameters of the injection holes 21 at the same distance from the wall surface of the combustion chamber 3 the same can further simplify the machining process while reducing the spray of the oil bundles 1 sprayed from the injection holes 21 closer to the wall surface of the combustion chamber 3 to the cylinder liner surface. In this embodiment, as shown in fig. 3, the first nozzle holes 211 and the sixth nozzle holes 216 have the same aperture, the second nozzle holes 212 and the fifth nozzle holes 215 have the same aperture, and the third nozzle holes 213 and the fourth nozzle holes 214 have the same aperture, so that only three nozzle holes 21 with different apertures need to be designed. In other embodiments, the adaptation may be performed according to the number of the injection holes 21 and the distance from the injection holes 21 to the wall surface of the combustion chamber 3.

Alternatively, the positions of the plurality of nozzle holes 21 in the circumferential direction of the nozzle 2 are symmetrical with respect to a section of the nozzle 2 in the length direction thereof. In the present embodiment, symmetrical cross sections are located between the first nozzle hole 211 and the sixth nozzle hole 216, and between the third nozzle hole 213 and the fourth nozzle hole 214. In other embodiments, the symmetrical cross-section can be adaptively selected according to the number and the positions of the injection holes 21.

Specifically, the aperture of each injection hole 21 can be determined by the flow rate of the injector and the distance from the injection hole 21 to the wall surface of the combustion chamber 3. It can be understood that the type and the type of the injector are different, and the flow rate is also different, so that the aperture of the spray hole 21 determined by combining the flow rate of the injector and the distance from the spray hole 21 to the wall surface of the combustion chamber 3 can ensure that the fuel of the oil beam 1 close to the spray hole 21 of the cylinder sleeve of the cylinder can be effectively reduced to touch the wall of the injector under the condition of proper flow rate, the flame quenching is reduced, and the HC emission is reduced. In this embodiment, the distance between the third nozzle hole 213 and the fourth nozzle hole 214 and the wall surface of the combustion chamber 3 is the largest, so the aperture between the third nozzle hole 213 and the fourth nozzle hole 214 is the largest, and the distance between the first nozzle hole 211 and the sixth nozzle hole 216 and the wall surface of the combustion chamber 3 is the smallest, so the aperture between the first nozzle hole 211 and the sixth nozzle hole 216 is the smallest. The specific size of the aperture of the nozzle hole 21 is not limited, and may be selected adaptively in the above manner.

Specifically, the specific positions of the injection holes 21 arranged in the circumferential direction of the nozzle 2 can be determined according to the flow rates of the injection holes 21. Further, the flow rate of the nozzle hole 21 is proportional to the area swept by the oil jet 1 ejected therefrom. It can be understood that, under the influence of the swirl in the cylinder, the oil bundles 1 injected from the injector nozzle holes 21 rotate along the swirl direction, each oil bundle 1 sweeps a certain area in the combustion chamber 3, the oil bundles 1 injected from each nozzle hole 21 are circumferentially distributed according to the difference of the flow rates of the nozzle holes 21 with different apertures, and the flow rates of the nozzle holes 21 are in direct proportion to the area swept by the oil bundles 1 injected from the nozzle holes, so that the proportion of oil and gas around each oil bundle 1 can be ensured to be consistent (i.e., the excess air coefficients are the same), the combustion can be improved, and the oil consumption can be reduced. In this embodiment, when the vortex in the cylinder rotates clockwise, the first area swept by the first nozzle hole 211 is determined by the flow rate of the first nozzle hole 211, and the distribution position of the sixth nozzle hole 216 can be obtained according to the first area, and so on, the specific positions of the circumferential distributions of the remaining nozzle holes 21 can be obtained. In other embodiments, the determination is also performed by the above method according to the number of the injection holes 21.

Alternatively, as shown in fig. 2, the intersection points of the center lines of the oil bundles 1 injected from the respective injection holes 21 and the wall surface of the combustion chamber 3 are located on the same contour line. It can be understood that, after the oil bundles 1 are ejected from the nozzle holes 21, the oil bundles will eventually hit the wall surface of the combustion chamber 3, so that the intersection points of the central lines of the oil bundles 1 and the wall surface of the combustion chamber 3 are located on the same contour line, that is, the intersection points are all located on the same circular arc line of the same contour, which can ensure that the oil bundles 1 are uniformly distributed in the combustion chamber 3, and is beneficial to complete combustion. The specific position of the contour line is not limited herein, and can be adaptively selected according to actual use requirements.

The embodiment also provides a diesel engine which comprises the oil injector. The diesel engine is a two-valve diesel engine, and the size of the aperture can be changed according to the distance from the spray hole 21 to the wall surface of the combustion chamber 3 by arranging the spray holes 21 in the fuel injector, so that the fuel oil of the oil beam 1 of the spray hole 21 close to the cylinder sleeve of the cylinder is effectively reduced to touch the wall, the flame quenching is reduced, and the HC emission is reduced; meanwhile, combustion can be improved through circumferential arrangement of the spray holes 21, oil consumption is reduced, and the use performance of the diesel engine is further improved.

The embodiment also provides a vehicle which comprises the diesel engine, and HC emission can be reduced while sufficient combustion is ensured through the arrangement of the injector spray hole 21 in the diesel engine, so that the power performance of the vehicle is improved.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A fuel injector for injecting a fuel jet (1) into a combustion chamber (3), comprising a fuel injector body and a nozzle (2) connected to the fuel injector body, the nozzle (2) being eccentrically arranged with respect to the combustion chamber (3), characterized in that the nozzle (2) comprises a plurality of spray holes (21) arranged at intervals, the plurality of spray holes (21) being distributed along a circumferential direction of the nozzle (2); the diameter of the injection hole (21) close to the wall surface of the combustion chamber (3) is smaller than the diameter of the injection hole (21) far away from the wall surface of the combustion chamber (3).

2. A fuel injector according to claim 1, characterized in that the diameters of the injection holes (21) at the same distance from the wall surface of the combustion chamber (3) are the same.

3. Fuel injector according to claim 1, characterized in that the positions of the plurality of injection holes (21) in the circumferential direction of the nozzle (2) are symmetrical with respect to a cross section of the nozzle (2) in the length direction thereof.

4. Fuel injector according to claim 1, characterized in that the axis of the nozzle (2) is arranged at an angle to the centre line of the bottom surface of the combustion chamber (3).

5. Fuel injector according to claim 4, characterized in that the flow rate of the nozzle hole (21) is proportional to the area swept by the oil jet (1) injected by it.

6. A fuel injector as claimed in claim 1, characterized in that intersection points of the center lines of the fuel bundles (1) injected from the respective injection holes (21) and the wall surface of the combustion chamber (3) are located on the same contour line.

7. Injector according to claim 1, characterized in that the number of injection holes (21) is 5-10.

8. Fuel injector according to any of claims 1 to 7, characterized in that the cross section of the injection hole (21) is circular.

9. A diesel engine characterised by comprising a fuel injector as claimed in any one of claims 1 to 8.

10. A vehicle comprising a diesel engine as claimed in claim 9.