JPS62206311A - Two-fluid jetting device of atomizing type burning equipment - Google Patents

Abstract

PURPOSE:To make the atomization of fuel and fire flame excellent over a wide range of the flow amount by a method wherein fluid fuel is spouted into an air flow revolving chamber for atomization and the fuel is atomized by an air flow for atomization spouted from the opening of an orifice while revolving around a fuel spouting needle. CONSTITUTION:At a burning air flow revolving chamber 2 a burning air flow is introduced around the axial center of the chamber and liquid fuel such as gas oil and kerosene or gasoline is sprayed into the center of a revolv-air flow at the chamber 2 from a two-fluid jetting device 11. When the spouting end of a fuel spouting needle is placed at the contracted flow part of an air flow for atomization spouted from the opening of an orifice 19 in projecting state from the face of the orifice 19, fuel spouted from the end of the needle 15 is smoothly mixed with the air flow for atomization spouted from the opening of the orifice 19 and transferred to stabilize the atomization of fuel and also make the atomization excellent. Further, the atomization of fuel is prevented from carbonization caused by its adhesion on the orifice 19.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a two-fluid injection device for a spray-type combustion apparatus, particularly a small-sized spray-type combustion apparatus for use in a vehicle.

Conventionally, small-sized spray combustion devices for on-vehicle use were developed through patent applications filed in 1980-
Ko/7! ;As shown in No. 1rA of No. II,
A two-fluid injection device is provided at one end of a cylindrical swirling chamber into which a combustion air flow swirling around the axis is introduced, and which injects liquid fuel to the other end of the swirling chamber. A combustion chamber is attached to the combustion chamber. In the above-mentioned 2m injection device, the fuel nozzle is arranged at the axial center position in the nitrogen passage, and the ejection end of the fuel nozzle is made to face the opening of the orifice provided at the air-qualified tip.

The liquid fuel f- and fP ejected from the ejection end of the fuel nozzle are atomized by airflow flowing from the outer circumferential position of the nozzle to the opening of the orifice.

However, in this two-fluid injection device, the fuel spray angle is narrow and the spray penetration force is strong.

Poor spray dispersion and poor mixing of the fuel spray with the combustion air stream. In particular, if the fuel flow rate is increased, part of the fuel spray may pass through the combustion chamber without being combusted. On the other hand, if the fuel flow rate is reduced, the fuel spray and thus the flame will become unstable and vibrate, which may cause the flame to blow out.

In other words, the range of fuel flow rates at which fuel jets or flames and therefore combustion are good is narrow, and the range of fuel flow rates that are good is narrow.
It is difficult to burn the fuel well.

An object of the present invention is to solve the above-mentioned problems.

It is an object of the present invention to provide a two-fluid injection device of a spray type combustion device that provides good fuel spray or flame over a wide range of fuel flow rates.

The present invention provides a two-fluid injection device that sprays liquid fuel toward the other end of a cylindrical combustion air flow swirling chamber into which a combustion air flow swirling around an axis is introduced. This is a two-fluid injection device of a spray type combustion device in which a combustion chamber is connected to the other end side of an airflow swirling chamber.

A cylindrical atomization air flow swirling chamber is formed around the fuel injection needle at the axial center position, into which an atomization air flow swirling in the same direction as the combustion air flow is introduced.

The ejection end tube of the fuel ejection needle is inserted into the opening of the orifice provided at one end of the atomization air flow swirling chamber, and the fluid fuel f ejected from the fuel ejection end is ejected from the opening of the orifice while swirling around the fuel ejection needle. Have you configured it to be atomized by the atomization airflow? This is a two-fluid ejection device with special features.

In the two-fluid injection device of the present invention, the liquid fuel is drawn from the ejection end of the fuel injection needle into the combustion air flow swirling chamber in which the combustion air flow swirls, and the combustion air flow flows around the fuel injection needle. While rotating in the same direction, the particles are atomized by the atomizing airflow jetted from the opening of the orifice. Therefore,
Fuel ri - as the atomizing air stream swirls in the same direction as the combustion air stream.

The fuel spray is stabilized and the spray angle is widened.

Also, since the angle of the fuel spray becomes wider, the angle of the spray becomes wider.
Since the force is weak, the spray is better dispersed, and the fuel spray is more easily mixed with the combustion air flow, resulting in better combustion. Even if the number of fuel flow pipes is increased, part of the fuel spray will not pass through the combustion chamber without being combusted. Since the fuel spray is stabilized, even if the fuel flow rate is reduced, the fuel spray or flame will not vibrate or the flame will not blow out.

That is, the fuel spray or flame is good over a wide range of fuel flow rates.

Next, one embodiment of the present invention will be described.

The spray combustion device equipped with the two-fluid injection device of this example has the seventh
15i! As shown in I, a two-fluid injection device is provided concentrically with αη to spray liquid fuel to one end side of a cylindrical combustion air flow swirling chamber (2) formed in the center of a swirler (1). A cylindrical first combustion chamber (with a diameter larger than that of the swirling chamber (2)) is connected to the other end of the combustion air flow swirling chamber (2) via a first throttle (4).
2) are arranged concentrically. In the stopping part of the first combustion chamber t2, that is, in the fuel spray area of the two fluid injection devices a and η, the ignition part at the tip of one spark plug is protruded, and the ignition source (c) is connected to the terminal at the base end of one spark plug. Connected. At the outlet of the first smoking chamber, a second combustion chamber having the same diameter as the first combustion chamber is concentrically connected via a second restrictor ◆. As shown in FIG. 1 and the second factor, the container (1) has an inner circumferential wall (3
) and a cylindrical outer circumferential wall (4) arranged concentrically around the outer circumferential position thereof.A front end plate (5) and a rear end plate (6) are provided at the front and rear ends of the cylindrical outer circumferential wall (4) to form a circular air swirling circuit (7). Forming and outer peripheral wall (4)
An air inlet pipe (8) is installed along the tangential direction of the
) are all connected to form nine air introduction passages (8) by connecting the air swirl circuits (7) and K, and connecting the air supply source (9) to the air introduction passage (81).
, and air inlet holes (+(I r
r: [The air swirl circuit (7) is connected to the combustion air flow swirling chamber (2), and the combustion air flow swirling around its axis is connected to the combustion air flow swirling chamber (2). I am configuring it to be installed.

2 fluid injection device 1t (lυ is, as shown in Fig.
liquid fuel from the fuel supply line l'I3, which penetrates the hole in the hole of It is a co-fluid spray type that is atomized by the flow. As shown in the 31st threshold and FIG.
A cylindrical atomization airflow swirling chamber Of3 is formed concentrically around the cylindrical part (to). Peripheral wall α of airflow swirling chamber Oe for atomization
At the ≠ point of η, set the air introduction hole (to) along the tangential direction of the inner circumferential surface at that point in the same direction as the air introduction hole C1O of the combustion air flow swirling chamber (2). Set it up.

An air supply vfPQ41 is connected to the atomization air flow swirling chamber OG, and the atomization air flow swirls in the same direction as the combustion air flow around the fuel injection needle 4 at the axial position of the atomization air flow swirling chamber Q6. Introducing; B configuration.

At the tip of the atomization airflow swirling chamber αG, an oriice 09 is provided concentrically, and the ejection end of the fuel injection needle 09 is inserted into the tapered opening of the orifice 09 to form a fuel injection needle/
The liquid duck material spouted from the L/4 spout end is atomized by the atomization air flow spouted from the opening of the mill chair 09 while rotating around the fuel jet needle α9.

In addition, the spray type combustion device of this example has a combustion chamber 21), e
13 is supplemented with a heat exchanger (to) to form a car heater.

As shown in Figure 1, the heat exchanger is connected to the first combustion chamber (toward the first combustion chamber).
and a cylindrical container-shaped vessel gradient is fitted into the second combustion chamber (toward),
``A Between the body ridge and the 1st and 2nd combustion chambers (to) and (a).

) is formed in the gas passage communicating with the outlet of the second combustion chamber M,
A large number of heat exchange fins 4 are provided at equal intervals along the axial direction at the outer circumferential position of the t4Ij2 combustion chamber on the inner peripheral surface of the vessel body, and a gas passage is provided in the first combustion chamber @ side portion of the vessel body. (To) Exit ■ is provided. The 2nd PS firing chamber (A) of the vessel body (A)
(1) The part is formed into a double container shape, and the fluid flow path is 0D.
A spiral heat exchange fin is provided on the inner peripheral surface of the fluid passage 6υ, and an inlet 0 is provided at one end and the other end of the fluid passage 0υ.
and an exit (b).

Note that a fluid supply source is connected to the inlet (to) of the fluid passage, and a combustor is connected to the outlet (b) of the fluid passage.

When the spray combustion device of this example is operated, a combustion air flow swirling around its axis is introduced into the combustion air flow swirling chamber (2), and from the co-fluid injection device αη to the combustion air flow swirling chamber (2).
Liquid fuel such as light oil, oil, or gasoline is injected into the center of the swirling UfX+ airflow in 2), and the mixed airflow of the sprayed fuel and swirling air flows from the combustion airflow swirling chamber (2) to the seventh throttle (trundle). ) flows into the first combustion chamber @.

It is ignited by the spark plug (2) and burns, and the combustion flame flows from the first combustion chamber @ to the second combustion chamber 4 with a diameter of tIIJ2 throttle, and the combustion exhaust gas flows from the second combustion chamber (toward). Gas passage (flowing into the mountain pass, fins and vessels for heat exchange in the gas passage @
It is fully heated and discharged from outlet (■). On the other hand, a fluid such as water or air supplied to the inlet of the fluid passage flows into the fluid passage GO, is heated by the heat exchange fins (2) of the fluid passage and the vessel body (2), and becomes high temperature. Exit - Ushima and others flow out.

In the two-fluid injection device RQll of this example, the orifice Q
The atomization air flow passage area of the opening No. 9 is set to 70 times or less of the opening area of the ejection end of the fuel injection needle αn on a credit sales basis. When it is within this setting range, the flow rate of the atomization air flow can be kept to the minimum necessary, and the fuel jet or flame can be stabilized.

Also, the opening diameter of the injection end of the fuel injection needle 09 is set to 0, 4.
It is set to 4 fl or less. If the setting f@ is within this range, the fuel spray will be stable without perturbation even if the fuel flow rate is as small as 0.0/ct/sea.

Moreover, the ejection end of the fuel ejection=-do/L/cL9 protrudes from the surface of the orifice fl'J and is arranged at the contraction part of the atomization air flow ejected from the opening of the orifice.

When arranged in this way, the fuel ejected from the ejection end of the fuel injection needle 09 is smoothly mixed with the atomization air flow ejected from the orifice opening, and is conveyed, stabilizing the fuel spray and atomizing the fuel. The situation is well maintained. Furthermore, the fuel spray does not adhere to the Oriice Q9 and cause carbonization.

In the two-fluid injection device αυ of the above embodiment.

Air introduction holes (to) are provided at several locations of the grain compensation airflow swirling chamber CJQO peripheral wall αη along the connecting direction of the inner circumferential surface of those locations. J3 figure and 4th! As shown in ■, it is parallel to the radial direction of the atomization airflow swirling chamber 0.
As shown in the figure, it may be moved obliquely.

Brief explanation of lA 9 planes Figure 1 shows 1 embodiment of the present invention 2 jet 4-type combustion with 2 fluid jet tilp pupil! It is a vertical side view of 'l1fi.

FIG. 2 is a sectional view taken along the line 1-1 in FIG. 1.

FIG. 3 is a partially enlarged vertical cross-sectional side view of the two-fluid ejection device on the same side.

FIG. μ is a sectional view taken along the line IV-IV in FIG. 3.

FIG. 5 is a partially enlarged longitudinal sectional side view of a two-fluid ejection device according to another embodiment.

FIG. 6 is a cross-sectional view taken along the line ■-■ in FIG. 85.

2: Combustion air flow swirling chamber 1): 2 fluid injection device 15: Fuel injection = -do V 16: Atomization air flow swirling chamber 19 Niorifice 21: Seventh combustion chamber 25: Co-combustion chamber

Claims (4)

[Claims] (1) A two-fluid injection device that sprays liquid fuel toward the other end is provided at one end of a cylindrical combustion air flow swirling chamber into which a combustion air flow swirling around the axis is introduced. This is a two-fluid injection device of a spray combustion device with a combustion chamber connected to the other end of the airflow swirling chamber, which swirls in the same direction as the above-mentioned combustion airflow around a fuel injection needle located at the axial center position. forming a cylindrical atomization airflow swirling chamber into which an atomization airflow is introduced;
The ejection end of the fuel injection needle is inserted into the opening of the orifice provided at one end of the atomization air flow swirling chamber, and the fluid fuel ejected from the ejection end of the fuel injection needle is directed to the orifice while swirling around the fuel injection needle. A two-fluid ejecting device characterized by having a structure in which atomization is performed by an atomization airflow ejected from an opening. (2) The two fluids according to claim 1, characterized in that the atomization air flow passage area of the opening of the orifice is set to 8 times or more and 40 times or less of the opening area of the jetting end of the fuel jetting needle. Injection device. (3) Set the opening diameter of the fuel injection needle to 0.4 fm.
Claim 1 characterized in that the setting is less than or equal to m.
The two-fluid ejection device according to item 1 or 2. (4) The ejection end of the fuel ejection needle protrudes from the surface of the orifice and is disposed in the contraction part of the atomization air flow ejected from the opening of the orifice.
2. A two-fluid ejection device according to item 2, item 2, or item 3.