Method of assembling fuel nozzle for combustion chamber and sprayer for fuel nozzle

FIELD: engine engineering.

SUBSTANCE: method comprises filling with solder the radial spaces made in the ring nozzle tip provided with the first nozzle openings for injecting primary fuel and in the cylindrical nozzle that embraces the ring nozzle tip and has second nozzle openings for injecting secondary fuel, setting the ring nozzle tip inside the cylindrical nozzle, mounting both of the members on the first fuel supply pipe for primary fuel and second fuel supply pipe for secondary fuel that embraces the first pipe and on the outer wall of the fuel nozzle, and setting the nozzle spryer assembled into the chamber where it is heated to provide adhesion of the members with solder.

EFFECT: expanded functional capabilities and eased assembling.

6 cl, 7 dwg

 

The technical field to which the invention relates.

The present invention relates to the field of fuel injection in turbomachines and, in particular, to the Assembly of the fuel injector in the combustion chamber of a turbomachine equipped with two units of the fuel injectors.

The level of technology

In combustion chambers with two sets of fuel injectors the fuel injectors that provide start-up and phase of small gas turbojet or turboprop engine (measured), called "trigger nozzle, and the fuel injectors that operate in cruise flight phases, - "key, or the workers." To trigger the injectors, the fuel is fed continuously, while the main fuel injectors the fuel is supplied, only starting from a certain minimum mode (which typically ranges from 10 to 30% of the nominal mode). In addition, during some modes of operation can operate only half of them, and the other half may be temporarily removed from operation.

There are various types of designs of fuel injectors. For example, in international application WO 94/08179 illustrates a typical two-block design, the starting fuel injector which is depicted in figure 3, and the main fuel injector - 4. These two fuel injector is essentially characterized by its the end part (spray), which contains a large number of parts and requires the use of sealing gaskets to ensure a proper seal between the primary and secondary supply systems.

This fact determines, on the one hand, the complexity of manufacture and Assembly of the fuel nozzles and, on the other hand, in certain conditions, namely under conditions of high temperatures, leads to the deterioration of their work, which is associated with a significant decrease in durability of the combustor and/or turbine, up to failure of the fuel injector and, respectively, are measured.

The invention

The problem to which the present invention is directed, is to create a method of assembling spray (end portion) of the fuel injector, which can eliminate the above mentioned shortcomings. Thus, another objective of the invention is to provide a specified sprayer with a minimum number of parts and reduced dimensions. Another object of the invention is to be embedded in the nozzle of the fuel injector cooling system and thereby to ensure that the fuel injectors at a very high temperature.

In accordance with the invention the solution of this problem is achieved by a method of assembling the fuel spray nozzles designed for ka is a career combustion are measured and containing means to supply primary fuel, includes the first fuel supply tube, to which is attached a ring to allow the tip of the first nozzle orifices for injection of the primary fuel in the specified combustion chamber, and means to supply secondary fuel, which includes a second fuel injection tube which surrounds the specified first pipe. The second fuel injection tube attached cylindrical nozzle surrounding specified to allow the tip and containing the second nozzle holes for injection of secondary fuels in the specified combustion chamber. The method according to the invention is characterized by the fact that the cylindrical nozzle and the ring to allow the tip is provided with radial cavities for receiving solder. At first, these cavities are filled with solder, then the ring to allow the tip is mounted inside a cylindrical nozzle, and these parts are mounted on the first and second fuel injection pipes supply of primary and secondary fuels, as well as on the outer wall of the fuel injector. In conclusion, such a nozzle is placed in a chamber where it is heated to provide alloy solder with the specified details.

Through the use of such technology soldering Assembly spray fuel injector is greatly simplified and is highly reliable and at the same time, more is quickly. In addition, a very small number of necessary parts for manufacturing such a fuel spray nozzle (in the preferred exemplary embodiment only two parts adjacent to the fuel injection tubes) greatly simplifies the subsequent maintenance.

In another preferred example, run the installation annular nozzle tip at a first fuel injection tube is carried out using a cylindrical connecting part containing radial cavity for receiving solder. Adding this third part allows to simplify the manufacture of the annular nozzle tip and easier to replace if necessary.

According to the exemplary embodiment, intended specially for the main fuel injector, before its installation on the specified outer wall of the injector installs a dividing wall in the cylindrical nozzle, the lower end of this wall is attached to the third tube, intended for supply of the cooling agent and environment are specified first and second fuel tubes.

Preferably the solder is chosen on the basis of gold or Nickel, and in the heating chamber to create a certain temperature selected in the range from 600 to 1100°depending on the properties subject to the Assembly of parts and used solder.

The invention is tositsa well as to spray the fuel injector to the combustion chamber of the turbomachine, collected using the described method according to the invention.

List of drawings

An example implementation of the present invention, additional features and advantages will be described in more detail below with reference to the accompanying drawings, on which:

figure 1 depicts in schematic form the cooling system of the fuel injectors of the turbomachine;

figure 2 depicts in enlarged scale, in the context of the main fuel atomizer nozzle according to the invention;

figure 3 depicts the sprayer on the form in the section plane III-III in figure 2;

figure 4 depicts the sprayer on the form in the section plane IV-IV in figure 2;

figure 5 depicts in enlarged scale, in the context of spray starting fuel injector according to the invention;

6 depicts a perspective exploded view of the nozzle of the fuel injector of figure 2;

7 depicts in perspective the nozzle of the fuel injector of figure 2 with a partial tear-out.

Information confirming the possibility of carrying out the invention

Figure 1 in the schematic view shows the fuel supply system and cooling of the fuel injectors of the combustion chamber of the turbomachine.

To facilitate understanding of the cooling system is illustrated with two fuel injectors (although in practice it may cover, for example, 20 starting and 40 of the main fuel injectors). System ohla the Denia is fed from a source 10 of the supply of the cooling agent (such as oil, water or any other fluid), the cooling system may be Autonomous or nonautonomous. The cooling agent initially passes through a "trigger" fuel injector 12, which enables the launch of the turbomachine and in idling conditions (low power). Next, the cooling flow is supplied in parallel (according to the principle of even number and odd number) through two so-called "basic" fuel injector 14, 16, which operate in the cruise, and then returns to the source 10, closing thus the cooling circuit. Of course, the system in the standard version also contains a feed pump cooling agent, filters, and various hydraulic regulators flow of the cooling agent.

The design of the launcher and main fuel injectors aeromechanical type are identical in relation to the fuel supply system and regulate its flow. The fuel supply system includes two systems: the primary system 120, 140 to ensure low costs and secondary system 122, 142 to ensure high costs. A relief valve 124, 144 provides the impossibility of the return flow from the fuel injector to a source 18 of the fuel supply and metering valve 126, 146 regulates the flow in the secondary system to ensure efficient operation under conditions reported to the I of the primary and secondary systems. In addition, each system is in its final part provided with a swirler 128, 130; 148, 150, which is due to its geometry provides spraying (zavarivanje) fuel.

In the starting of the fuel injectors 12 cooling system is limited by the fact that surrounds the metering valve 126 at the level of the valve head. In contrast, the main fuel injectors 14, 16 cooling system goes down to the nozzle of the spray from these nozzles before again rising to the dosing valve 146, which she also surrounds. As practice shows, there is the problem of coking main fuel nozzles 12, which may be exposed to high temperatures due to the lack of circulation of fuel during certain modes of operation. With regard to spray starting fuel injectors, their temperature does not exceed the threshold coking (150° (C) due to the continuous circulation of the cooling agent in all operating modes. Therefore, in principle, cooling tips starting the fuel injectors is not required. Of course, you can take the same design of the cooling system for both types of fuel injectors that will simplify the overall manufacturing process of the nozzle.

Figure 2 and 3 shows more detail on passing into the chamber 20 of the combustion end part, or the main spray top the top nozzle 14, 16 in accordance with the invention. For clarity in these drawings, the fuel injector shown in greatly enlarged scale. Almost spray the fuel injector has a diameter of about 10-15 mm

In this end portion of the fuel injector contains a ring to allow the tip 152 with the longitudinal axis 154 corresponding to the Central axis of the fuel injector. Ring to allow the tip 152 is installed in the inner groove 156 of the cylindrical nozzle 158 is fixed by soldering to the end of the outer wall 160 of the fuel injector. The connection by soldering the two parts 158, 160 are made using stock metal solder, which are in radial cavities 159a, 159b, machined radially at the upper end of the nozzle 158. In the process of heating the metal comes from the radial cavities 159a, 159b capillary movement and provides a rigid connection between these two parts. The nozzle includes an annular groove 162 that surrounds the inner groove 156 and goes in depth on the end of the annular nozzle tip 152, from which it is separated by a cylindrical sleeve 164. The upper end of the cylindrical sleeve 164 is also strengthened by soldering on the Central cylindrical part 166a of the connecting part 166. In this cylindrical part 166 is made blind (blind) axial groove 168, PR is walking from the Central part 166a in the lower portion 166b. The open end of the groove 168 to the cylindrical part 166 is attached by soldering the first toplivopodayuschaya tube 170. The tube 170 is designed to supply the primary fuel from the main body of the fuel nozzle 172 to which it is attached to its upper end. The housing is mounted on the casing of the turbomachine in a known manner, so that it is fixed on the drawing is not presented.

The connection by soldering the three parts 164, 166a, 170 also is manufactured using stocks solder located in the radial cavities a, 165b, s. These cavities machined radially in the Central part 166a of the specified cylindrical part 166, capillary exit of the solder during heating of the solder, which provides a rigid connection of this cylindrical part 166 of the sleeve 164 on the one hand and the Central tube 170 with the other hand. The lower portion 166b cylindrical part 166 having a smaller diameter in comparison with the Central part 166a, set with a partial fence and attached by soldering in an internal groove 174 of the annular nozzle tip 152 (using reserves solder in the cavities a, 175b, machined radially in the annular nozzle tip 152). The upper part is cylindrical part 166, which has a larger diameter (the thickness of the sleeve 164) compared with the Central part 166a, attached by soldering to the second end of toprivate the soup of the tube 176, which is located coaxially of the first fuel injection tube 170 and has a larger diameter. Second toplivopodayuschaya tube 176 is designed to supply secondary fuel from the main body of the fuel injector 172, the output of which it is also attached. The connection by soldering the two parts s, 176 also is manufactured using stocks of solder in the cavities a, 177b. These cavities machined radially in the upper part C details 166, capillary exit of the solder during heating of the solder, which provides a rigid connection of these two parts. Second toplivopodayuschaya tube 176 extends into the internal annular cavity 178, which is made in the upper part s parts 166 and communicates with the longitudinal hole 180 (for example, with three evenly spaced around the circumference of channels for the circulation of secondary fuels in part 166.

In the connecting part 166, near its back end 166b performed also through the transverse holes a, 182b, is intended for messages of its Central groove 168 with an internal groove 174 of the annular nozzle tip 152 (preferably these transverse holes alternating with radial cavities a, 165b, s, as shown in figure 4). In addition, on the free lower end of the connecting part 166 machined screw channels 184 (forming the primary swirler 14), designed for zavarivanje primary fuel. The fuel goes from the first fuel injection tube 170 and sequentially passes through the axial groove 168, the inner groove 174 and the transverse holes 182. Similarly the ring to allow the tip 152 at its outer wall, which is in contact with the inner groove 156 of the cylindrical nozzle 158, provided with spiral grooves 186 (forming the secondary swirler 150). Helical grooves 186 are designed to zavarivanje secondary fuel, which extends from the second fuel supply tube 176 and sequentially passes through the annular cavity 178, longitudinal holes 180 and the inner groove 156. At its free end which is not connected with the connecting part 166, the circuit to allow the tip 152 contains the first coplowe hole 188, equipped with a primary discharge cone, for injection of the primary fuel coming out of the screw channels 184. For the secondary fuel coming out of the screw grooves 186, provided that the internal groove 156 of the cylindrical nozzle 158 surrounding the ring to allow the tip 152, ends with the second nozzle hole 190 with secondary exhaust cone concentric with the first.

In addition to these funds flow from the fuel injector and primary and secondary fuel, primary fuel and force the NCA contains special funds supply of the cooling agent, which allow a General cooling of the nozzle with a maximum heat dissipation. For this purpose the tubular dividing element 192 is introduced in an annular groove 162 of the cylindrical nozzle 158 in such a way that on both sides of this element is formed of first and second coaxial annular channels 194 and 196, which can circulate under the pressure of the cooling agent. The passage of the cooling agent between the two zones is provided by multiple connecting holes 198, which are made in this item at the level of its lower end. This lower end rests on the bottom of the grooves 162 and passes below the level of the first nozzle holes 188, thereby providing cooling of the entire sprayer, until the very end of the fuel injector.

The upper end of the separating element 192 is attached by soldering to the third tube 200, which is located coaxially aligned first and second fuel injection tubes 170, 176, has a slightly larger diameter and is also connected to the outlet of the housing of the fuel injector 172. As described above solder, the connection between the parts 192 and 200 may be performed using stocks of solder in the cavities machined radially in the lower end of the dividing element 192. Capillary exit of the solder during heating of the solder provides hardcoded the connection. In a simpler embodiment, the solder may be distributed in the gap 193 between these parts. Thus, toplivopodayuschaya tube 200 forms a first annular channel 202 around the second fuel supply tube 176 to enter the cooling agent and the second annular channel 204 between this tube 200 and the outer wall 160 of the fuel injector to return the cooling agent to the source 10 after passage in one direction back and forth along the entire length of the fuel injector along the circular channels 194, 196. This design ensures the passage of the cooling agent in one direction and then back along the length of the tubes feeding the primary and secondary fuels with the full environment of these fuel injection tube channel cooling, allows the maximum amount of heat, in contrast to known devices, which often contain lead channel on one side of the fuel nozzle and the discharge channel from the other side.

Figure 5 depicts the atomizer (the end part) of the starting fuel injector according to the invention in Assembly. The design of the fuel injector, generally similar to the construction of the main fuel injector, with the exception of the cooling system, in which the nozzle is missing. Spray starting fuel injector includes an annular allow the tip 252 with the longitudinal axis 254, installed in EXT is nna groove 256 of the cylindrical nozzle 258, which is soldered on the end face of the outer wall 260 of the fuel injector. The connection by soldering the two parts 258, 260 is manufactured using stocks of solder in the cavities 259a, 259b, machined radially in the lower end of the nozzle 258, capillary exit of the solder during heating of the solder, which provides a rigid connection of the two parts. In its intermediate part of the nozzle 258 is attached by soldering to the Central cylindrical part a fasteners 266. In this cylindrical part 266 performed blind (blind) axial groove 268 extending from the Central portion in the bottom portion 266b. At the open end of the groove 268 to the cylindrical part 266 is attached by soldering the first toplivopodayuschaya tube 270 to supply the primary fuel from the housing of the starting fuel injectors 272 to which it is attached to its upper end. The housing is mounted on the casing of the turbomachine in a known manner, so that it is fixed on the drawing is not presented.

The combination of three parts 258, a, 270 soldering is also produced using stocks of solder in the cavities 265a, which are machined radially in the Central part a specified cylindrical part 266, capillary exit of the solder during heating of the solder. This provides a rigid connection of this cylindrical part with a nozzle 258 with one hand and with Central the second tube 270 on the other hand. The lower portion 266b cylindrical part 266 having a smaller diameter in comparison with the Central part, set with a partial fence and attached by soldering in an internal groove 274 annular nozzle tip 252 (through stocks solder in the cavities a, 275b, machined radially in the annular nozzle tip 252). The upper part is cylindrical part 266, which has a larger diameter in comparison with the Central part a attached by soldering to the end of the second fuel injection tube 276, which is located coaxially of the first fuel injection tube 270 and has a larger diameter. Second toplivopodayuschaya tube 276 is designed to supply secondary fuel from the housing of the starting fuel injectors 272, the output of which it is also attached. The connection by soldering the two parts s, 276 also made using stocks of solder in the cavities a, 277b. These cavities machined radially in the upper part s part 266, capillary exit of the solder during heating of the solder, which provides a rigid connection of these two parts. Second toplivopodayuschaya tube 276 is published in the internal annular cavity 278, which is made in the upper part s parts 266 and communicates with longitudinal channels 280 (for example, with three evenly spaced around the circumference of channels for the circulation of secondary fuels in detail and 266.

In fasteners 266, near its back end is made also through the transverse holes 282, intended for messages of its Central groove 268 with an internal groove 274 annular nozzle tip 252 (preferably these transverse holes alternating with radial channels). In addition, on the free lower end of the fitting 266 machined screw channels 284 (forming the primary swirler 128), designed to zavarivanje primary fuel, which extends from the first fuel injection tube 270 and sequentially passes through the axial groove 268, internal groove 274 and transverse holes 282. Similarly the ring to allow the tip 252 on its outer wall which is in contact with the inner groove 256 of the cylindrical nozzle 258, provided with spiral grooves 286 (forming the secondary swirler 130). Helical grooves 286 intended to zavarivanje secondary fuel, which extends from the second fuel injection tube 276 and sequentially passes through the annular cavity 278, longitudinal channels 280 and the inner groove 256. At its free end which is not connected with the connecting piece 266, ring to allow the tip 252 contains the first coplowe hole 288, equipped with a primary discharge cone for primary injection that is Liwa, coming out of the screw channels 284. For the secondary fuel coming out of the screw grooves 286, provided that the internal groove 256 of the cylindrical nozzle 258 surrounding the ring to allow the tip 252, ends with the second nozzle hole 290 with secondary exhaust cone concentric with the first.

The method of assembling the fuel injectors will be explained with reference to Fig.6, where the main fuel atomizer nozzle of figure 2 is shown in exploded view prior to Assembly (the dividing wall and the outer wall is not shown), and 7 at which the dispenser is shown in perspective assembled. It is clear that the method can also be used to build the starting fuel injectors in figure 5.

The Assembly is performed after the individual machining each of the three parts forming the nozzle (end part) of the fuel injector nozzles 158, annular nozzle tip 152 and the Central connecting part 166. It should be noted that in another, not present embodiment, parts 152 and 166 can be made in a single piece. Assembly, or installation of finished parts includes the following steps: first of all fill with solder radial channels, forming reserves of solder in each of these three parts, then these parts are collected among themselves and formed from them uz is l mounted on the fuel injection tubes of the primary and secondary fuel and forth on the outer wall of the nozzle. In conclusion, the entire assembled unit (atomizer) is placed in a chamber where it is heated to provide a connection of the solder with the specified details.

Soldering can be carried out, for example, in a furnace or gas-way. When gas soldering want to build parts is heated to a temperature plasticization (turnover)". Upon reaching this temperature, the solder flows and rises into existing between the parts of the gap size from 0.05 to 0.25 mm (capillary gap), through the connection. The gas circulation contributes to the softening of the solder. In the case of brazing in a furnace in it create a certain temperature ranges from 600 to 1100°chosen depending on the properties subject to the Assembly of parts and used solder. The solder is preferably chosen on the basis of gold or Nickel.

The simplicity of this method of Assembly by solder provides significant reliability workmanship fuel injectors, as it no longer depends on the quality of soldered joints, which in the known methods were performed manually, or the quality of the Assembly of numerous parts with sealing compounds.

1. The method of Assembly of the fuel spray nozzles (12, 14, 16), designed for camera (20) of the turbomachine combustion and containing means to supply primary fuel, which includes the first fuel injection tube (170), which is resident ring to allow the tip (152) with the first nozzle orifices (188) for injection of the primary fuel in the specified combustion chamber, and means to supply secondary fuel, which includes a second fuel injection tube (176), which surrounds the specified first tube and to which is attached a cylindrical bore (158), environment specified to allow the tip and containing the second nozzle hole (190) for injection of the secondary fuel in the specified combustion chamber, characterized in that the cylindrical nozzle and the specified ring to allow the tip is provided with radial cavities (159, 175) for receiving solder, and the first mentioned cavity fill specified solder, then the specified ring to allow the tip is placed within the specified cylindrical nozzle, after which these parts set in the above first and second fuel injection pipes supply of primary and secondary fuels, as well as on the outer wall (160) fuel injectors, then such a nozzle is placed in a chamber where it is heated to provide a connection of the solder with the specified details.

2. The method according to claim 1, characterized in that the installation of the specified ring nozzle tip on the specified first fuel injection tube is carried out using cylindrical fittings (166)containing radial cavity (165) for receiving solder.

3. The method according to claim 1 or 2, characterized in that th is prior to installation on the specified outer wall of the injector installs a dividing wall (192) in the specified cylindrical nozzle, the lower end of this wall is attached to the third tube (200)designed to supply cooling agent and environment are specified first and second fuel tubes.

4. The method of Assembly according to any one of claims 1 to 3, characterized in that the solder has as the basis of gold or Nickel.

5. The method of Assembly according to any one of claims 1 to 3, characterized in that the specified camera creates a certain temperature selected in the range from 600 to 1100°depending on the properties subject to the Assembly of parts and used solder.

6. Spray the fuel injector to the combustion chamber of a turbomachine, assembled according to the method, opened in any one of claims 1 to 5.



 

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8 cl, 3 dwg

FIELD: fuel systems.

SUBSTANCE: the device for supply of fuel to the combustion chamber has at least one main nozzle and one preliminary-injection nozzle, pump, the first actuator valve installed in the first pipe-line connected to the preliminary-injection nozzle, the second actuator valve used for control of fuel consumption in the secondary pipe-line connected to the preliminary-injection nozzle through the first actuator valve rated at a lower consumption rate. The first pipe-line is also connected to the main nozzle for control of consumption of fuel supplied to the nozzle by the first actuator valve, provision is made for a direction- selecting valve installed past the first valve, and an intermediate line connecting the first and second lines that are used for fuel supply to the main nozzle and/or to the preliminary-injection nozzle.

EFFECT: provided stable fuel supply to the combustion chamber.

8 cl, 2 dwg

FIELD: continuous combustion chambers using liquid or gas fuel.

SUBSTANCE: fuel nozzle comprises first valve that closes when the pressure of inflowing fuel reaches a given value and second batching valve mounted at the outlet of the first valve, which is opened under the action of the second given value of fuel pressure. The second valve is open when the pressure increases so that to provide the inflow of fuel to the consumers. The batched fuel flow rate is a function of the flowing sections of the openings made at the level of the second valve. The nozzle is additionally provided with means for individual adjusting of the second threshold value of pressure made so that to provided the uniform injection of fuel to the combustion chamber.

EFFECT: expanded functional capabilities.

4 cl, 6 dwg

FIELD: continuous combustion chambers.

SUBSTANCE: combustion chamber comprises hollow cylindrical housing whose wall receive scroll and air radial swirlers with blades that provide swirling in opposite directions, shells, bushings mounted for permitting movement in radial direction, branch pipe, swirling chambers, and nozzle. Each combined nozzle has centrifugal nozzle whose outer side is in a contact with inner side of the bushing and jet nozzle with cylindrical housing mounted coaxially in the inner space of the branch pipe between the outer wall of the housing of the jet nozzle and inner wall of the branch pipe. The outlet section of the housing of the jet nozzle is bent to the passage of the scroll spiral of the radial swirler. The outlet section of the jet nozzle is parallel to the wall of the inlet section of the branch pipe and is at a distance of 0.8-1.2 of the diameter of the jet nozzle housing from it.

EFFECT: reduced hydraulic drag and oxides emission.

9 dwg

FIELD: engine engineering.

SUBSTANCE: method comprises filling with solder the radial spaces made in the ring nozzle tip provided with the first nozzle openings for injecting primary fuel and in the cylindrical nozzle that embraces the ring nozzle tip and has second nozzle openings for injecting secondary fuel, setting the ring nozzle tip inside the cylindrical nozzle, mounting both of the members on the first fuel supply pipe for primary fuel and second fuel supply pipe for secondary fuel that embraces the first pipe and on the outer wall of the fuel nozzle, and setting the nozzle spryer assembled into the chamber where it is heated to provide adhesion of the members with solder.

EFFECT: expanded functional capabilities and eased assembling.

6 cl, 7 dwg

FIELD: gas-turbine engine engineering.

SUBSTANCE: ring combustion chamber comprises fire tube and vortex burners arranged over periphery of its face and made of fuel-air scroll and air swirlers with outlet conical branch pipe having cylindrical section. The shell is secured to the face coaxially to each branch pipe defining a ring space. The outer side of the end cylindrical section or inner side of the shell located above it is provided with longitudinal ribs distributed uniformly over periphery and defining insulated passages. The through openings connected with the ring space are made in the face of the fire tube under the shell.

EFFECT: enhanced reliability and expanded functional capabilities.

2 cl, 2 dwg

FIELD: gas-turbine engine engineering.

SUBSTANCE: method comprises separating the fuel supply through small fuel nozzle from that through high-flow rate nozzle, with controllable fuel supply realized directly in the device. The device comprises outer housing, high-flow rate nozzle made of outer housing of the small fuel nozzle and secured to it, piston-slide valve, and spring, interposed between the outer housings of the device and high-flow rate nozzles provided with the passages for fuel supply. The fuel supply is controller by opening passages for supplying fuel to the small nozzle and closing the passages for supplying fuel to the high-flow rate nozzle. When the pressure of fuel increases, the passages for supplying fuel to the high-flow rate nozzle are opened, and the passages for supplying fuel to the small nozzle are simultaneously closed.

EFFECT: enhanced efficiency.

2 cl, 5 dwg

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