JPS6022068A - Fuel injection valve device - Google Patents

Abstract

PURPOSE:To obtain a good spraying characteristic at all times by a method wherein a return hole is opened at a place opposite to the nozzle of an eddy-current chamber and a choke, opened and closed in accordance with the pressure of the eddy-current chamber, is provided on the way of a fuel return path from the return hole, in the fuel injection valve equipped with the eddy-current chamber. CONSTITUTION:The fuel injection valve 1 in a gas turbine engine is constituted by forming the first eddy-current chamber 26 between a vortex plate 16 and a valve body 18 and the second eddy-current chamber 28 between a bortex holder 14 and the first eddy-current chamber 26 in the lower part thereof and the eddy-current chamber 26 is opened in the same chamber 28 through a nozzle 30 while the eddy-current chamber 28 is opened in a combustion chamber through the nozzle 32 respectively. In this case, a relief opening 185 is provided on a wall surface opposite to the nozzle 30 of the eddy- current chamber 26 and the opening 185 is communicated with a return pipe through a reverse flow preventing valve 80, a choke member 74 and the like. The choke member 74 is provided with a control valve 75 constituted so as to chole the opening area of an orifice 741 in accordance with the pressure of the eddy-current chamber 26 in case the pressure of the eddy-current chamber 26 has arrived at a predetermined value.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to an AJ valve for use in a continuous combustion device such as a gas turbine engine.

BACKGROUND ART Fuel injection valves for combustors such as those equipped with a swirl chamber are known.
The valve has good atomization characteristics, but due to atomization, C
A certain amount of pressure 141 and flow rate to one vortex chamber is required. Contamination, on the other hand, means a lack of applicability when the pressure and flow rate to the swirl chamber is low.

In order to improve the characteristics of a fuel injection valve equipped with a swirl chamber at low flow rates, it is conceivable to connect the swirl chamber to a return pipe through a throttle. That is, the difference between the amount of fuel entering the swirl chamber and the amount of fuel being returned is the actual injection amount. That is, the amount of fuel that is returned multiplied by -U becomes the fuel that enters the swirl chamber. As a result, the fuel pressure is increased, and sufficient vortex strength can be obtained within the vortex chamber, resulting in improved spray characteristics at low flow rates. However, simply returning some fuel from the swirl chamber does not provide control over a wide range of flow rates and wastes energy at high flow rates.

Purpose of the Invention The present invention has been made in view of the above problems, and it is possible to suppress wasteful energy consumption while covering a wide flow rate range.
ζAn object of the present invention is to provide a fuel injection valve that can obtain good spray characteristics.

According to the present invention, in order to achieve the above object, Vortex/J! j
In a fuel injection valve with a chamber, the injection IJ in the swirl chamber
A return hole is opened on the opposite wall of the fuel return passage from the return hole. A fuel injection valve device is provided in which a weak spring C is inserted between the return hole and the return hole to close the return hole.

Actual Example - To explain an example, in Fig. 1, 1 is a fuel injection valve, which is installed in the combustion chamber wall 2 of a combustion engine. is introduced into the flow control device 5 by the pump 4.The flow control device introduces fuel at a pressure (flow rate) corresponding to the operating conditions of the engine into the fuel injection valve 1 via a vibro. Return the fuel a::V to the tank.

Fig. 2 shows the structure of the fuel injection valve 1 according to the present invention in perspective.1 The embodiment shown in Fig. 2 has two large and small swirl chambers, and when the flow rate is small, the smaller swirl chamber The present invention is applied to a type of apparatus in which in addition to this vortex chamber, a larger vortex chamber is used to receive each jet. In the figure, 10 is a main body, and 12 is a nozzle holter. The nozzle boulder 12 has a cylindrical shape, and a portex holder 14, a portex plate 16, a valve body 18, and a valve plate 1-20 are sequentially inserted into the nozzle boulder 12.

In this inserted state, the main body 10 is inserted into the nozzle main body 12 via the O-ring 22, and the outer cylinder 24 brings them into a mutually fastened state.

As shown in the enlarged view in Figure 3, portex plate 1
A first swirl chamber 26 is formed between the portex plate 16 and the valve body 18, and a second swirl chamber 28 is formed between the portex plate 16 and the Borna 7X bolter 14 in the T direction of the first swirl chamber 26. is formed. The first vortex chamber 26 is
The second swirl chamber 28 opens into the combustion chamber of the cast turbine engine by means of a second jet 32. 3
0 is located on two sides of the second nozzle 32 so as to face it.

In FIG. 1, 34 indicates a fuel supply connector 36 and a plug μ.
O'; It is a plate having a return double blind connector 38, and is fixed to the main body 10 of 7' by a camp 40 via an O ring old and 41'. The camp 40 has a cylindrical part 401 which is fitted into the hole 101 of the main body IO by 11x, and a backflow prevention valve 42 is installed in the 16j-shaped part 461. This check valve 42 is formed as a ball valve,
It is arranged between the valve seat 44 and the spring seat 46, which are inserted into the Ti91-shaped part 40I.

Spring 48 V1 Valve 42 'CC always Halxy-1-44
The valve holes of the valve seats 1 and 44 are connected to the fuel TL of the fuel supply connector 36 through the vertical holes 402 and 2 holes 403 in the camp 40.
3 Connected to Gl. -1 of the check valve 42
The fuel chamber 50 formed in the flow is connected to the passage 102 in the body 10.
, annular passage 52 between body 1 (+) and nozzle hole 12, annular passage 54 between halcyon body 18, valve plate 1-20 and nozzle hole 912, in valve body I8; heating hole 181, valve body 184 and portex plate 16 and a first inlet 158
1-1 to the first swirl chamber 56 (see FIG. 3).

In FIG. 2, 60 is a control valve, which is configured as a ball valve. The control valve 60 is biased by an adapter 64 which receives the force of a spring 62 to seat the valve seat 1-202 formed in the valve plate 20. The valve bore of the valve seat 1-202 opens into the annular passage 54 through a bore 204 in the valve plate 20 and receives fuel supply therefrom.

The space 66 above the valve seat 1 is a passage 206 in the valve plate l-, a fuel passage 184 in the half body 18,
A passage 161 in the portex plate 6 opens into the second vortex chamber 28 via an annular passage 67 and a second inlet L170 (see FIG. 3).

The first inflow 1'' 58 into the first swirl chamber 26 opens in its tangential direction, as schematically shown in FIG.

Similarly, the second inflow 70 into the second swirl chamber 28 is also tangentially open. As is well known, the opening L1 of the inlet 1 into the vortex chamber in the tangential direction causes a circulation in the vortex chamber.

According to the present invention, when the flow rate is small, (The vortex chamber 26 that handles J is provided with a relief opening IJ (hole) 185 on the wall opposite to the nozzle. The opening I) 35 is bored in the portex plate I6, and as described below. A portion of the fuel is returned from the swirl chamber 26.

+1/i I'+ By installing it in the opposite case to 26, it is possible to conduct part of the fuel 1 Nj without affecting the swirling flow in the vortex chamber 26 in the slightest. can. Swirl chamber 2 (i & J open 1.-1185, pore 1 in valve body 8) (7, constriction part 4A74, hole 207 in valve syringe [20, body 1 (l and valve sylle 1-
annular 1Iiii passage 76 between 20 and passage 1 in body 10;
05, HIU, and a vertical hole 381 and a horizontal hole 382 in the fuel return connector 38, it is connected to the pipe 7 in FIG. is configured as a 1゛1↑1 shape, and is threadedly fitted into the thread 1878 in the bore IB'7.

The aperture member 74 has a hexagonal hole 740 at -0111,
Insert a tool into the hole and press it six times to adjust the return amount as described below.The throttle member 74 has an orifice 41 at the other end.A control valve 75 serving as a needle faces this orifice. The needle 75 receives a force such that it slides against the orifice 741 by the spring 76.A communication hole 185 that opens into the first swirl chamber 26
is equipped with a second non-return valve 8o, and this valve 80 has an extremely weak spring 77 whose upper end abuts against the needle 75, so that the valve seat 188 near the communication hole 185 is always kept cold (=J
He is exerting his power.

To describe the operation of the device of the present invention described above, when the device is stopped, the force of the spring 48 causes the first check valve 42 to close the valve seat 1-4'4, while the force of the spring 77 causes the first check valve 42 to close the valve seat 1-4'4.
A downward force is applied to the second check valve 8o to open it [formerly 85
Valve seat 188 close to cold. This prevents fuel from dripping out of the nozzle when stopped.

When the device starts operating, pump 4 then 1! from flow control device 5! , the fuel is from the Bizoro to the fuel '1' of the fuel injector I.
1 supply: Introduced to J connector 3G, passage 361, hole 40
3. 4+12, the check valve 42 is pushed open and the combustion chamber 50 is entered. Fuel flows from the chamber 50 through the passage ■02°52.
54 p 181 p 5b and enters the first inlet 58
is introduced tangentially into the first vortex chamber 26 and generates hr times θ:t therein. The swirling property ('1') The fuel Au+ flow is sprayed from the first jet 1 30 through the second nozzle 32 into the combustion chamber in the form of a thin liquid film in the shape of a circle tIC. When the liquid film in the form of a thin circle 1'' reaches a flight distance of 1, it is well atomized into particles 111.
When the JF force of h1 fuel is small, that is, the spray is in the low flow rate i1 region (lLj l), and the characteristic input U-1 pressure (i.e., the fuel from the flow rate control device) is The pressure) is expressed by the solid line II in Fig. 6.Since the fuel pressure acting on the control light fi (l) is small, the pressure state is 4.2.1 The cylinder is closed. Second swirl chamber 2
8 to fuel &;t: (Jli not supplied. This low flow ht
At this point, the pressure of the fuel supplied into the first vortex 6fE chamber 26 acts on the check valve 80 and pushes it open from the valve seat 188 against the spring 77. At a pressure of , the spring 76 is set so that the needle 75 does not move, thus opening the orifice 741, i.e.
The first swirl chamber 26 includes a communication hole 185 and an orifice 74.
1, passages 207, 105, 106, holes 381.
It communicates with the return pipe 7 via 382. The return flow at this time is determined by the diameter of the orifice 741.

As described above, since the fuel is flowing out from the first vortex chamber 26, the flow rate introduced into this chamber 26, that is, the pressure p must be increased, otherwise the expected injection amount from the nozzle 30 will be reduced. I
It will be like not being able to get M. As a result, sufficient swirling flow strength can be achieved in the swirl chamber 26 even in a region where the injection amount is small, and sufficient atomization can be achieved even in this region. Unlike the present invention, when such a return piping system is not installed, the spray amount characteristics from the first swirl chamber 26 are as shown in Fig. 5 m1.
It will be as follows. By installing a return arrangement L system for the same amount of cinders, the population pressure of the vortex chamber can be increased.

This allows good atomization to be maintained at low flow rates.

When the pressure in the first swirl chamber 26 reaches pl in FIG. Therefore, the needle 75 lifts the opening area of the orifice 741 according to the increase in pressure in the vortex chamber. Therefore, the amount of returned fuel gradually decreases. As a result, the injection amount gradually approaches the characteristic m1 in the case where there is no orifice, as indicated by X in Fig. 741 was fully opened, and as a result,
The return combustion ++1 becomes zero, and the injection amount characteristic becomes ml.

When the fuel 1 pressure reaches the set value p3, the control valve 60
<The fuel pressure is overcome by the spring 62 and the valve 60 is separated from the valve seat 202, and the fuel flows through the passage 2 (16, 184, 101).

7 leads to a second inflow 1170, which is introduced tangentially into the second vortex chamber 21. Each time the jet from the swirl chamber 28 is added to the jet from the first swirl chamber 26, the flow rate characteristic is expressed as 0 instead of n12 in FIG. m i
From the flow rate Q1 at time n, a wide change in flow 'rUl at maximum pressure (]2 is fl. Shown by the two-dot chain line in the figure!1
and (When 17 uses orifice 741 as a fixed aperture,
The one-dot chain lines ml and ml are the characteristics when the orifice 741 is not installed, that is, when fuel reflux is not performed. In the low flow rate region, a small flow rate equivalent to that with a fixed orifice (#+) can be obtained, and in the high flow rate region, a large flow rate equivalent to that without an orifice (ml) can be obtained.

In the second embodiment shown in FIG.
0 is threadedly fitted, and the lower end of the needle 75 is in contact with this adjuster 9 (). The adjuster 90 also serves as the spring 4 of the return spring 77. Adjuster 9
0 has an opening 901 in the center and a needle 75.
The lower end flange 752 of the groove 752A is arranged so as to not interfere with the smooth flow of the return port when the needle 75 is closed. In this embodiment, by adjusting the adjuster 90, the initial pressure 1 of the needle '15, that is, the force pl in FIG. 5 that starts to control the Jl flow, can be made variable.
Fuel injection! 11 + I of 14 valves, gender change, and even quality 13 will become easier.

Effects of the Invention The present invention provides GJ, as shown in the graph of FIG.
The pressure of the orifice is changed according to the pressure of the vortex chamber.This results in a lower flow rate compared to the case where the refill is not variable. A wide flow rate range is possible.

Masoko, as in the example, two large and small vortex chambers are used together)
, 2, from the property of 11 to the zero property of ml) ° is η- to the circle li between the pressure of 1) and pl, and if
(Point 1) Flow that would occur if the switch was made at 3) 11
Sudden changes are suppressed. Furthermore, each time the check valve 80 is closed and the spring 77 is installed, the fuel injection
Regardless of the J attitude, fuel dripping can be prevented by 1.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of the entire device including the fuel injection valve of the present invention, Fig. 2 is a sectional view of the natural injection valve Qb' of Fig. 1, and Fig. 3 is a full sectional view of the FIG. 4 is a plan view of the swirl chamber, FIG. 5 is a flow rate characteristic diagram of the fuel injector of the present invention, and FIG. 6 is a partial enlarged view of the second embodiment. A small enlarged view, Fig. 7 is a bottom view of the knee 1 along the Vll-■ line in Fig. 6. ■... Fuel injection valve, 7... Return pipe, 26, 2
8... Whirlpool chamber, 30, 32--spout, 74... Throttle part shrine, 77... Spring, 80... Backflow prevention valve. Patent Applicant: Yota Jidosha Co., Ltd., Patent Application Agent: Akira Aoki, Physician, Patent Attorney, Kazuyuki Nishidate, Patent Attorney, Takao Mitsui, Patent Attorney, Akira Yama, Ll. : ::', ,,, 7+
+. Figure 5 Pressure'. JP-A ■GGO-22068 (6) Figure 6 0 Figure 7

Claims (1)

[Claims] ■In a fuel injection valve equipped with a swirl chamber, a return hole is opened on the wall surface opposite to the jet entering the swirl chamber, a throttle is placed in the middle of the fuel return passage from the return hole, and the throttle is A fuel injection valve device having a needle that opens and closes according to the pressure of a swirl chamber, and a biased check valve that closes the return hole with a weak spring between the needle and the return hole. .