JPH0614032Y2 - Whirlpool-type diesel engine with auxiliary nozzle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a vortex chamber type diesel engine with a sub-injection in which the vortex chamber communicates with the main combustion chamber by means of a main injection port and an auxiliary injection port. It promotes agitation and mixing to improve combustion and thereby enhance engine output.

<Prior Art> The basic structure of a vortex chamber type diesel engine with an auxiliary nozzle, which is the subject of the present invention, is as shown in FIG. 1 or FIG.
The bottom portion 3 of the vortex chamber 2 is connected in parallel to the eccentric portion of the main combustion chamber 1 of the vortex chamber type diesel engine E by the main injection port 4 and the auxiliary injection port 5, and the fuel injection nozzle 6 is exposed to the top of the vortex chamber 2. ,
The air is tangentially pushed into the vortex chamber 2 from a portion 2b distant from the center of the main combustion chamber 1, and the combustion gas is blown in a direction A approaching the center of the main combustion chamber 1. The main injection port 4 is formed so as to be inclined, so that the fuel injected from the fuel injection nozzle 6 to the side 2a near the center of the main combustion chamber 1 in the vortex chamber 2 is guided into the main combustion chamber 1. It is of a type in which the auxiliary injection port 5 is oriented.

As a conventional technique of this type, there is a utility model Sho 61-18182.
As shown in the publication (see FIG. 2), the injection port 100 of the fuel injection nozzle 6 is formed so as to be injected from the auxiliary injection port 5 toward the main combustion chamber 1, and the injection is performed. The fuel F is supplied to the side 2a of the vortex chamber 2 near the center of the main combustion chamber 1.
After being sprayed to the main combustion chamber 1 from the main injection port 4 while being directed along the vortex flow B, a part of this fuel is discharged from the sub injection port 5 during the ignition delay. There is something I did.

In the above-mentioned conventional technique, not only the vortex chamber 2 but also the main combustion chamber 1 in which the gas flow is gentle is supplied with fuel via the sub-injection port 5, and combustion proceeds in both chambers 1 and 2. The maximum combustion temperature can be suppressed as compared with the case where the air is burned in the vortex chamber 2, so that the amount of NOx generated can be reduced.

<Problems to be Solved by the Invention> However, in the above conventional technique, the direction B of the vortex flow in the vortex chamber 2 generated by the forced air C during the compression process is the same as the direction D of the injection flow created by the injected fuel flow F. Because it will be the same,
The stirring and mixing of the fuel and air in the vortex chamber 2 is not promoted so much, the particle size of the fuel mist is scarcely changed, and the contact surface with air does not become large.

Further, since the relative speed between the fuel and air is not large, heat transfer is poor and the ignition delay becomes long.

As a result, the combustion in the vortex chamber 2 becomes dull, and the momentum of flame propagation to the main combustion chamber 1 is not strong, so that the engine output and the fuel consumption are reduced and the amount of smoke is increased.

This invention makes it a technical subject to improve combustion in a vortex chamber, and to improve engine output and fuel consumption.

<Means for Solving Problems> Means for achieving the above problems will be described below with reference to the drawings corresponding to the embodiments.

That is, according to the present invention, in the vortex chamber type diesel engine with a sub-injection having the above-mentioned basic structure, the main injection port 7 is provided with the main injection port 7 and the sub-injection port 8 at the tip of the fuel injection nozzle 6, and the main injection fuel M is stored in the vortex chamber 2. The main injection port 7 is formed so as to be opposed to the vortex flow, and the sub injection port 8 is oriented so that the sub injection fuel S is injected from the sub injection port 5 into the main combustion chamber 1. It is characterized by forming.

<Operation> The direction D of the injection flow produced by the main injection fuel M is the direction B of the vortex flow in the vortex chamber 2 generated by the forced air C during the compression stroke.
The two fluids violently collide with each other, which promotes the agitating and mixing of the fuel and air in the vortex chamber 2, and the fuel is miniaturized to increase the contact surface with the air and to promote the oxidation reaction. Make it smooth.

Further, as described above, the relative velocity between the fuel and air is increased, heat transfer is improved, and ignition delay is shortened. Therefore, in combination with the promotion of the stirring and mixing described above, the combustion in the vortex chamber 2 is promoted. Is improved.

Further, the sub-injected fuel S is ejected from the sub-injection port 5 into the main combustion chamber 1 during the ignition delay, combustion proceeds in both the vortex chamber 2 and the main combustion chamber 1, and the maximum combustion temperature is suppressed.

<Effects of the Invention> (1) Since combustion in the vortex chamber is improved, engine output can be increased, fuel consumption can be reduced, and smoke generation can be suppressed.

(2) Since the maximum combustion temperature is suppressed, the amount of NOx generated can be reduced.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical sectional front view of the vicinity of a vortex chamber, in which a cylinder 11 is formed in the center of a cylinder block 10 of a vortex chamber type diesel engine E, and a piston 12 is fitted in the cylinder 11 so as to be vertically slidable. A gap between the upper end of 12 and the lower surface of the cylinder head 14 is set in the main combustion chamber 1.

Further, a substantially spherical vortex chamber 2 is formed between the cylinder head 14 and the mouthpiece 15 fitted from the lower surface thereof, and the vortex chamber 2 is located at an eccentric position deviated from the center of the main combustion chamber 1 of the engine E. Deploy.

The fuel injection nozzle 6 is inserted into the top of the vortex chamber 2, the main injection port 4 and the sub injection port 5 are opened in parallel in the base 15 forming the bottom 3 of the vortex chamber 2, and these are connected to the main combustion chamber 1. To do.

The main injection port 4 is formed in an inclined shape so as to approach the center of the main combustion chamber 1 as it goes down, and the upper end thereof is tangentially connected to a portion 2b of the vortex chamber 2 on the side far away from the center of the main combustion chamber 1. To be done.

Therefore, the air is tangentially pushed into the vortex chamber 2 from the remote portion 2b, and the combustion gas is ejected in an inclined manner in the direction A approaching the center with respect to the main combustion chamber 1.

Further, although the auxiliary injection port 5 is formed in the same inclination direction as the main injection port 4, the inclination gradient is larger than that of the main injection port 4, and the upper end thereof is a portion 2a on the side closer to the center of the main combustion chamber of the vortex chamber 2.
And its lower end is connected to the vicinity of the open end of the main injection port 4 facing the main combustion chamber 1.

A main injection port 7 and a sub-injection port 8 are formed at the tip of the fuel injection nozzle 6 in a direction in which they diffuse into each other, and the main injection port 7 is formed so as to be directed to the remote portion 2b of the vortex chamber 2. M
The direction D of the jet flow is set to face the direction B of the vortex flow generated by the forced air in the vortex chamber 2.

Then, the injection direction of the sub injection port 8 is made to coincide with the opening direction of the sub injection port 5 so that the sub injection fuel S is smoothly ejected from the sub injection port 5 into the main combustion chamber 1.

Therefore, next, the function of the vortex chamber type diesel engine with the auxiliary injection port will be described.

(1) The vortex chamber 2 is tangentially formed through the main injection port 4 during the compression stroke.
As shown in FIG. 1, the forced air that has flowed into the cylinder swirls in the direction B corresponding to the counterclockwise rotation, whereas the main injection fuel M injected from the main injection port 7 of the fuel injection nozzle 6 is Since the fuel and air collide with each other in the D direction, the fuel and air collide with each other to promote agitation and mixing, and the fuel is miniaturized and the heat transfer is improved, so that good combustion is obtained. .

Therefore, the output of the engine E and the fuel consumption are increased, and
Incomplete combustion is prevented and the amount of smoke generated is suppressed.

(2) The sub-injection fuel S injected from the sub-injection port 8 of the fuel injection nozzle 6 proceeds straight down the vortex chamber 2 to the main combustion chamber 1 from the sub-injection port 5 of the mouthpiece 15 and to the main combustion chamber 1. Ejects along the direction A approaching the center.

As a result, in parallel with the combustion in the vortex chamber 2, combustion is also started in the main combustion chamber 1, the maximum combustion temperature is suppressed, and NOx is reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional front view of the vicinity of a vortex chamber 2 of a vortex chamber type diesel engine with a secondary injection port showing an embodiment of the present invention, and FIG. 2 is a view corresponding to FIG. 1 ... Main combustion chamber, 2 ... Vortex chamber, 2a ... 2, part of the side closer to the center of 1; 2b ... 2, part of the side away from the center of 1; 4 ... Main injection port, 5 ... Sub injection port, 6 ... Fuel injection nozzle, 7 ... Main injection port, 8 ...
Sub injection port, E ... Engine, M ... Main injection fuel, S ...
Secondary injection fuel.

Claims (1)

[Scope of utility model registration request] 1. A vortex chamber of a main combustion chamber 1 of a vortex chamber type diesel engine E is provided with a bottom portion 3 of a vortex chamber 2 at a main injection port 4 and a sub injection port 5.
And the fuel injection nozzle 6 is faced to the top of the vortex chamber 2, and the air is tangentially pushed into the vortex chamber 2 from a portion 2b which is far from the center of the main combustion chamber 1. At the same time, the main injection port 4 is formed so as to be inclined so that the combustion gas blows out in the direction A approaching the center of the main combustion chamber 1, and the main combustion chamber 1 in the vortex chamber 2 is formed from the fuel injection nozzle 6. In the vortex chamber type diesel engine with a sub-injection port formed by orienting the sub-injection port 5 so that the fuel injected to the side 2a close to the center of the The main injection port 7 is formed so that the main injection port 7 and the sub injection port 8 are opened and the main injection fuel M is injected so as to be opposed to the vortex flow in the vortex chamber 2. So as to be injected into the main combustion chamber 1 from the sub injection port 5 Secondary injection port with the swirl chamber type diesel engine, which comprises an oriented formation.