A fuel nozzle structure for an aircraft engine combustion chamber

Abstract

The present invention provides a fuel nozzle structure for an aircraft engine combustion chamber. By designing the secondary nozzle as a dual-channel coaxial centrifugal nozzle in conjunction with a two-stage valve structure, graded fuel supply to the secondary oil circuit is achieved. This resolves the conflict between the dual-channel nozzle structure used in the prior art, which struggles to balance fuel atomization performance at low fuel flow rates with the engine's demand for continuously increasing maximum fuel flow rates. Furthermore, by employing a low-flow-rate (high oil pressure, good atomization) centrifugal nozzle in the inner layer of the dual-channel coaxial centrifugal nozzle to achieve good atomization at low fuel flow rates, and a higher-flow-rate centrifugal nozzle in the outer layer controlled by a valve to begin operation at a suitable fuel flow rate before the main oil circuit begins supplying fuel, fuel distribution in the combustion area is more uniform.

Description

Technical Field

[0001] The present application belongs to the field of aero-engine technology, and in particular relates to a fuel nozzle structure for a combustion chamber of an aero-engine. Background Art

[0002] Currently, aircraft engine combustion chamber nozzles generally use a dual-oil circuit structure, in which the secondary oil circuit uses a centrifugal nozzle structure to ensure atomization quality at low fuel supply volumes, and the main oil circuit uses a centrifugal + pneumatic composite atomizing nozzle structure to ensure that the fuel supply pressure at maximum fuel supply does not exceed the fuel pump limit. In pursuit of breakthroughs in full-envelope performance, new high-performance aircraft engines have significantly increased the temperature before the turbine, while also increasing the demand for high-altitude ignition performance. To balance higher temperature before the turbine and ignition performance, the combustion chamber requires better fuel atomization performance at low fuel supply volumes, while also increasing the upper limit of the maximum fuel supply volume. Existing nozzles can no longer meet the requirements of high atomization quality at low fuel supply volumes and the requirement of high fuel supply pressure within the limit, necessitating the development of a new nozzle structure design.

[0003] Existing nozzles utilize a dual-path nozzle structure, with a centrifugal nozzle for the secondary path and a centrifugal and pneumatic composite atomizing nozzle for the primary path. Centrifugal nozzles utilize a high pressure drop to meet fuel atomization requirements. To achieve better atomization quality at low fuel flow rates, the pressure drop of the secondary nozzle must be further increased (using a secondary nozzle with a smaller flow rate, i.e., requiring a higher fuel pressure at the same flow rate). To ensure combustion performance, a specific ratio of fuel flow between the primary and secondary nozzles is required. If the maximum fuel flow rate requirement is further increased, a fixed ratio will result in a further increase in the maximum flow rate of the secondary nozzle. Using a secondary nozzle with a smaller flow rate will lead to a sharp increase in the secondary nozzle's fuel pressure (fuel flow is proportional to the square of the fuel pressure), which is difficult for existing fuel pumps to meet. Even if the fuel pump's capacity meets the maximum fuel pressure requirement, the sealing performance and reliability of the entire fuel supply system will decrease under higher fuel pressure conditions, and the weight of the piping structure will also increase. Summary of the Invention

[0004] In order to solve the above problems, the present application provides an aircraft engine combustion chamber fuel nozzle structure, comprising:

[0005] Normally open oil circuit, first adjustable oil circuit and second adjustable oil circuit;

[0006] in,

[0007] The normally open oil circuit includes: an oil inlet hole located on the nozzle housing, a cavity formed in the nozzle housing and communicating with the oil inlet hole, and a first secondary oil circuit communicating between the cavity and the secondary nozzle;

[0008] The first adjustable oil circuit includes: the oil inlet, the cavity, the first piston cavity connected to the cavity via the first piston cavity inlet, the first piston cavity outlet, and a second secondary oil circuit connected between the first piston cavity outlet and the secondary nozzle; wherein the first piston cavity is formed by the first valve housing and the first piston, and the volume of the cavity is changed by the movement of the first piston; the first piston cavity outlet includes a first valve housing outlet located in the first valve housing and a first piston outlet located on the first piston; when the first piston moves to a preset position, the first valve housing outlet and the first piston outlet are connected;

[0009] The second adjustable oil circuit includes: the oil inlet, the cavity, the second piston chamber inlet, the second piston chamber, the second piston chamber outlet, and a main oil circuit connecting the second piston chamber outlet and the main nozzle; wherein the second piston chamber is formed by the second valve housing and the second piston, and the volume of the second piston chamber can be changed by the movement of the second piston; the second piston chamber outlet includes a second valve housing outlet located in the second valve housing and a second piston outlet located on the second piston; when the second piston moves to a preset position, the second valve housing outlet and the second piston outlet are connected;

[0010] The first piston and the second piston are pushed by the pressurized fuel entering through the first piston chamber inlet and the second piston chamber inlet respectively. The first piston and the second piston are respectively provided with springs to resist the pushing.

[0011] Preferably, the first valve housing, the second valve housing, the first piston and the second piston together constitute a valve, wherein the first piston and the second piston integrally form a secondary oil circuit piston body and a main oil circuit piston body at different axial positions on the piston rod, the first valve housing and the second valve housing constitute a valve housing, the valve housing includes a bushing and a main oil circuit valve seat, the bushing has a guide cylinder for sleeveing ​​the center rod of the piston rod, an inner wall of the secondary oil circuit bushing for sleeveing ​​the secondary oil circuit piston body and an inner wall of the main oil circuit bushing for sleeveing ​​the main oil circuit piston body, the secondary oil circuit piston body and the inner wall of the secondary oil circuit bushing form the first piston chamber, the main oil circuit piston body and the inner wall of the main oil circuit bushing form the second piston chamber, the inlet of the first piston chamber is the oil hole on the bushing; the outlet of the first valve housing is the bushing side wall oil hole on the inner wall of the secondary oil circuit bushing, the first piston chamber and the second piston chamber are connected through the first oil hole located on the secondary oil circuit piston body and the second oil hole located on the main oil circuit piston body.

[0012] Preferably, the first valve housing outlet includes an annular groove provided on the inner wall of the auxiliary oil circuit bushing and an oil hole on the bushing side wall opened in the annular groove, and the first piston outlet includes an auxiliary oil circuit valve window provided on the side wall of the auxiliary oil circuit piston body, and when the auxiliary oil circuit valve window moves to the annular groove, the oil circuit is opened;

[0013] The valve housing is sleeved on the auxiliary oil circuit valve seat, and the valve housing and the auxiliary oil circuit valve seat form an annular cavity that isolates the cavity, and the first piston outlet is connected to the second auxiliary oil circuit through the annular cavity.

[0014] Preferably, the main oil circuit piston body is cylindrical, and a cylindrical second piston chamber is formed inside it. The second piston outlet is a main oil circuit valve window opened on the side wall of the main oil circuit piston body. The inner wall of the main oil circuit bushing has an oil collecting ring groove. The main oil circuit valve window is connected to the oil collecting ring groove at a preset position. The bottom surface of the main oil circuit piston body, the wall surface of the oil collecting ring groove and the main oil circuit valve seat form a bottom chamber, and the bottom chamber is connected to the main oil circuit.

[0015] Preferably, the specific manner in which the bottom cavity is connected to the main oil circuit includes: the main oil circuit is arranged at the bottom of the cavity, a first joint recess is formed at the edge of the main oil circuit inlet, the outer side of the bottom of the auxiliary oil circuit valve seat has a first joint protrusion that is plugged into the first joint recess, the inner side of the bottom of the auxiliary oil circuit valve seat has a second joint recess, the bottom of the main oil circuit valve seat has a second joint protrusion that is plugged into the second joint recess, and the bottom cavity is connected to the main oil circuit through a channel that passes through the second joint protrusion, the second joint recess, the first joint protrusion and the first joint recess.

[0016] Preferably, an inner wall surface of the cavity formed by the valve housing and the nozzle housing forms a gap for the oil passage to flow normally.

[0017] Preferably, the cavity formed by the nozzle housing includes a first cavity and a second cavity connected in series; the first valve housing and the first piston constitute a first valve, the first valve is placed in the first cavity, the second valve housing and the second piston constitute a second valve, the second valve is placed in the second cavity.

[0018] Preferably, the effective contact area between the first piston and the fuel is larger than the effective contact area between the second piston and the fuel, and the effective contact area is the area of ​​the piston projected on a plane perpendicular to the direction of piston movement.

[0019] Preferably, the auxiliary nozzle includes an inner auxiliary nozzle and an outer auxiliary nozzle circumferentially arranged at the outer edge of the inner auxiliary nozzle, the normally open oil circuit is connected to the inner auxiliary nozzle, and the first adjustable oil circuit is connected to the outer auxiliary nozzle.

[0020] Preferably, the distance that the first piston outlet moves from the initial position to the first valve housing outlet position and is connected is shorter than the distance that the second piston outlet moves from the initial position to the second valve housing outlet position and is connected.

[0021] The advantages of this application include: the present invention provides a fuel nozzle structure for an aircraft engine combustion chamber. By designing the secondary nozzle as a dual-channel coaxial centrifugal nozzle with a two-stage valve structure, the secondary oil circuit is provided with a graded fuel supply, resolving the contradiction between the dual-channel nozzle structure used in the prior art, which is difficult to balance the atomization performance of the fuel at a small fuel supply and the engine's demand for continuously increasing maximum fuel supply. In addition, by using a low-flow-rate centrifugal nozzle in the inner layer of the dual-channel coaxial centrifugal nozzle to achieve good atomization at a small fuel supply, and using a higher-flow-rate centrifugal nozzle in the outer layer, which is controlled by a valve to start operating at a suitable fuel supply before the main oil circuit begins to supply fuel, the fuel distribution in the combustion area can be more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of a preferred embodiment of the present application in which dual oil-circuit nozzles are connected in series.

[0023] Figure 2 This is a schematic diagram of the valve structure of a preferred embodiment of the present application, in which dual oil nozzles are connected in series;

[0024] Figure 3 This is a schematic diagram of the valve piston structure of a preferred embodiment of the present application with dual oil nozzles in series;

[0025] Figure 4 This is a schematic diagram of the bushing structure of a preferred embodiment of the present application in which dual oil nozzles are connected in series;

[0026] Figure 5 This is a schematic structural diagram of a preferred embodiment of the present application in which dual oil-circuit nozzles are connected in parallel. DETAILED DESCRIPTION

[0027] To make the technical solution and its advantages of the present application clearer, the technical solution of the present application will be described in further detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of the present application and are only used to explain the present application, not to limit the present application. It should be noted that, for ease of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0028] The present application provides a fuel nozzle structure for an aircraft engine combustion chamber, comprising:

[0029] Normally open oil circuit, first adjustable oil circuit and second adjustable oil circuit;

[0030] in,

[0031] The normally open oil circuit includes: an oil inlet hole 1a located on the nozzle housing 1, a cavity formed in the nozzle housing 1 and communicating with the oil inlet hole 1a, and a first secondary oil circuit communicating between the cavity and the secondary nozzle;

[0032] The first adjustable oil circuit includes: the oil inlet hole 1a, the cavity, the first piston cavity connected to the cavity through the first piston cavity inlet, the first piston cavity outlet, and the second secondary oil circuit connected between the first piston cavity outlet and the secondary nozzle; wherein the first piston cavity is formed by the first valve housing and the first piston, and the volume of the cavity is changed by the movement of the first piston; the first piston cavity outlet includes a first valve housing outlet located in the first valve housing and a first piston outlet located on the first piston, and when the first piston moves to a preset position, the first valve housing outlet and the first piston outlet are connected;

[0033] The second adjustable oil circuit includes: the oil inlet hole 1a, the cavity, the second piston chamber inlet, the second piston chamber, the second piston chamber outlet, and the main oil circuit connecting the second piston chamber outlet and the main nozzle 5; wherein the second piston chamber is formed by the second valve housing and the second piston, and the volume of the second piston chamber can be changed by the movement of the second piston; the second piston chamber outlet includes a second valve housing outlet located in the second valve housing and a second piston outlet located on the second piston. When the second piston moves to a preset position, the second valve housing outlet and the second piston outlet are connected;

[0034] The first piston and the second piston are pushed by the pressurized fuel entering through the first piston chamber inlet and the second piston chamber inlet respectively. The first piston and the second piston are respectively provided with springs to resist the pushing.

[0035] In combination with the above two adjustable oil circuits, the specific implementation methods of this application include a series structure and a parallel structure;

[0036] Example 1: Series structure.

[0037] like Figure 1-Figure 4 As shown,

[0038] It mainly consists of nozzle housing 1, valve 2, main oil circuit valve seat 3, inner layer auxiliary nozzle 4, main nozzle 5, inner air swirler 6, outer air swirler 7, auxiliary oil circuit valve seat 8, outer layer auxiliary nozzle 9. The composition of valve 2 can be seen in Figure 2 , including a piston 2a, a spring 2b, a bushing 2c, and a clamp 2d.

[0039] Piston 2a structure participation Figure 3 It is mainly composed of a piston rod 201a, an auxiliary oil circuit piston body 202a, an auxiliary oil circuit valve window 203a, an oil hole 204a, a main oil circuit piston body 205a, an oil hole 206a, and a main oil circuit valve window 207a, and the main body is a rotating body.

[0040] Bushing 2c structure see Figure 4 It is mainly composed of the inner wall 201c of the auxiliary oil circuit bushing, the oil hole 202c, the oil hole 203c on the bushing side wall, and the inner wall 204c of the main oil circuit bushing, and the main body is a rotating body.

[0041] Specifically, the first valve housing, the second valve housing, the first piston and the second piston together constitute the valve 2, wherein the first piston and the second piston are integrally formed to form the auxiliary oil circuit piston body 202a and the main oil circuit piston body 205a at different axial positions on the piston rod 201a, the first valve housing and the second valve housing constitute the valve housing, the valve housing includes a bushing 2c and a main oil circuit valve seat 3, the bushing 2c has a guide cylinder for sleeveing ​​the center rod of the piston rod 201a, an auxiliary oil circuit bushing inner wall 201c for sleeveing ​​the auxiliary oil circuit piston body 202a and a main oil circuit piston body 205a for sleeve The main oil circuit bushing inner wall 204c, the auxiliary oil circuit piston body 202a and the auxiliary oil circuit bushing inner wall 201c form the first piston chamber, the main oil circuit piston body 205a and the main oil circuit bushing inner wall 204c form the second piston chamber, the first piston chamber inlet is the oil hole 202c on the bushing 2c; the first valve housing outlet is the bushing side wall oil hole 203c on the auxiliary oil circuit bushing inner wall 201c, the first piston chamber and the second piston chamber are connected through the first oil hole 204a located on the auxiliary oil circuit piston body 202a and the second oil hole 206a located on the main oil circuit piston body 205a.

[0042] The first valve housing outlet includes an annular groove provided on the inner wall 201c of the auxiliary oil circuit bushing and an oil hole 203c on the bushing side wall opened in the annular groove. The first piston outlet includes an auxiliary oil circuit valve window 203a provided on the side wall of the auxiliary oil circuit piston body 202a. When the auxiliary oil circuit valve window 203a moves to the annular groove, the oil circuit is opened.

[0043] The valve housing is sleeved on the auxiliary oil circuit valve seat 8, and the valve housing and the auxiliary oil circuit valve seat 8 form an annular cavity that isolates the cavity. The first piston outlet is connected to the second auxiliary oil circuit through the annular cavity.

[0044] The main oil circuit piston body 205a is cylindrical, and a cylindrical second piston chamber is formed inside it. The second piston outlet is a main oil circuit valve window 207a opened on the side wall of the main oil circuit piston body 205a. The inner wall 204c of the main oil circuit bushing has an oil collecting ring groove. The main oil circuit valve window 207a is connected to the oil collecting ring groove at a preset position. The bottom surface of the main oil circuit piston body 205a, the wall surface of the oil collecting ring groove and the main oil circuit valve seat 3 form a bottom chamber, and the bottom chamber is connected to the main oil circuit.

[0045] The specific manner in which the bottom cavity is connected to the main oil circuit includes: the main oil circuit is arranged at the bottom of the cavity, a first joint recess is formed at the edge of the main oil circuit inlet, the outer side of the bottom of the auxiliary oil circuit valve seat 8 has a first joint protrusion that is plugged into the first joint recess, the inner side of the bottom of the auxiliary oil circuit valve seat 8 has a second joint recess, and the bottom of the main oil circuit valve seat 3 has a second joint protrusion that is plugged into the second joint recess, and the bottom cavity is connected to the main oil circuit through a channel that passes through the second joint protrusion, the second joint recess, the first joint protrusion and the first joint recess.

[0046] The inner wall of the cavity formed by the valve housing and the nozzle housing 1 forms a gap 11 for the oil passage to flow normally.

[0047] The effective contact area between the first piston and the fuel 10 is greater than the effective contact area between the second piston and the fuel 10. The effective contact area is the area of ​​the piston projected on a plane perpendicular to the direction of piston movement.

[0048] Preferably, the auxiliary nozzle includes an inner auxiliary nozzle 4 and an outer auxiliary nozzle 9 circumferentially arranged at the outer edge of the inner auxiliary nozzle 4 , the normally open oil circuit is connected to the inner auxiliary nozzle 4 , and the first adjustable oil circuit is connected to the outer auxiliary nozzle 9 .

[0049] Preferably, the distance that the first piston outlet moves from the initial position to the first valve housing outlet position and is connected is shorter than the distance that the second piston outlet moves from the initial position to the second valve housing outlet position and is connected.

[0050] The working principle of the embodiment of this application:

[0051] In the non-working state, the auxiliary oil circuit valve window 203a on the auxiliary oil circuit piston body 202a and the main oil circuit valve window 207a on the main oil circuit piston body 205a are tightly surrounded by the auxiliary oil circuit bushing inner wall 201c and the main oil circuit bushing inner wall 204c of the bushing 2c respectively, and fuel cannot pass through.

[0052] After starting work, the fuel 10 enters the nozzle through the oil inlet hole 1a on the nozzle housing 1. When the flow rate is very low, the oil supply pressure is small, and the pressure generated by the fuel on both sides of the piston 2a on the valve 2 is not enough to push the spring 2b. The fuel 10 only flows into the inner auxiliary oil pipe 1c of the nozzle housing 1 through the gap 11 formed between the auxiliary oil circuit valve seat 8 and the nozzle housing 1, and finally flows out of the nozzle through the inner auxiliary nozzle 4 and produces good atomization.

[0053] When the flow rate gradually increases, the oil supply pressure gradually increases, and the pressure generated by the fuel 10 on both sides of the piston 2a on the valve 2 is sufficient to push the spring 2b, so that the piston rod 201a on the piston 2a drives the auxiliary oil circuit piston body 202a and the main oil circuit piston body 205a to move relative to the bushing 2c, until the position of the auxiliary oil circuit valve window 203a on the auxiliary oil circuit piston body 202a is no longer surrounded by the auxiliary oil circuit bushing inner wall 201c of the bushing 2c. At this time, the main oil circuit valve window 207a on the main oil circuit piston body 205a is still surrounded by the main oil circuit bushing inner wall 204c of the bushing 2c, and the fuel cannot enter the main oil circuit. The fuel 10 will flow through the oil hole 202c of the bushing 2c, the auxiliary oil circuit valve window 203a and the oil hole 203c on the bushing side wall into the gap 12 formed between the bushing 2c and the auxiliary oil circuit valve seat 8, and then enter the outer auxiliary oil pipe 1d, and finally flow out through the outer auxiliary nozzle 9 and produce good atomization.

[0054] When the flow rate increases further, the oil supply pressure increases further, and the pressure of the fuel 10 on both sides of the piston 2a on the valve 2 increases further, so that the piston rod 201a on the piston 2a drives the auxiliary oil circuit piston body 202a and the main oil circuit piston body 205a to move relative to the bushing 2c to increase the distance, until the position of the main oil circuit valve window 207a on the main oil circuit piston body 205a is no longer surrounded by the main oil circuit bushing inner wall 204c of the bushing 2c. The fuel 10 will flow through the oil holes 204a and 206a of the piston rod 201a, enter the main oil circuit piston body 205a, and then flow into the gap 13 formed between the main oil circuit piston body 205a and the bushing 2c through the main oil circuit valve window 207a, and then enter the main oil pipe 1b of the nozzle housing 1, and finally flow out of the nozzle through the main nozzle 5 and produce good atomization under the shearing action of the swirling air in the inner air swirler 6 and the outer air swirler 7.

[0055] The flow rate of the inner layer auxiliary nozzle of this application is not more than 20, the flow rate of the outer layer auxiliary nozzle is not more than 70, and the equivalent flow rate of the double layer auxiliary nozzle at the maximum oil supply is not less than 50.

[0056] In summary, the primary and secondary oil circuit piston bodies of this embodiment are tandem. The primary oil circuit piston body is hollow cylindrical with a valve window on the side. A fuel flow path is formed between the primary oil circuit piston body and the secondary oil circuit piston body through oil holes. Each section has no fewer than four oil holes, which are evenly distributed angularly, and the holes between the two sections are staggered. The bushing has oil holes on the side to supply oil to the outer secondary nozzle. An oil collecting ring groove is designed at the oil hole to reduce fuel pressure fluctuations. The oil collecting ring area is at least five times larger than the bushing oil inlet hole area. The bushing sidewall oil holes are located below the oil collecting groove, between 25% of the height of the oil collecting groove and the lowest point. There are more than six oil holes, evenly distributed angularly. The clearance between the inner wall of the secondary oil circuit bushing and the outer annular surface of the secondary oil circuit piston body is no more than 0.025mm per side, and the clearance between the inner wall of the primary oil circuit bushing and the outer annular surface of the primary oil circuit piston body is no more than 0.012mm per side.

[0057] Example 2: Parallel structure.

[0058] like Figure 5 As shown: the cavity formed by the nozzle housing 1 includes a first cavity and a second cavity connected in series; the first valve housing and the first piston constitute a first valve, the first valve is placed in the first cavity, the second valve housing and the second piston constitute a second valve, the second valve is placed in the second cavity.

[0059] Specifically, it mainly consists of a nozzle housing 1, a valve 2, a main oil valve seat 3, an inner auxiliary nozzle 4, a main nozzle 5, an inner air swirler 6, an outer air swirler 7, an auxiliary valve 8, and an outer auxiliary nozzle 9. The main valve and auxiliary valve structures are similar to those of the prior art and will not be described again.

[0060] When the nozzle is working, the fuel 10 enters the nozzle through the oil inlet hole 1a on the nozzle housing 1. When the flow rate is very low, the oil supply pressure is small, and the pressure generated by the fuel on both sides of the piston on the valve 2 is not enough to push the spring. The fuel 10 only flows into the auxiliary oil chamber 1g of the nozzle housing 1 through the gap 11 formed between the main oil circuit valve seat 3 and the nozzle housing 1. At this time, the pressure generated by the fuel on both sides of the piston on the auxiliary valve 8 is also not enough to push the spring. The fuel 10 only flows into the oil collecting chamber 1f through the oil hole 1e of the nozzle housing 1, and then enters the inner auxiliary oil pipe 1c, and finally flows out of the nozzle through the inner auxiliary nozzle 4 and produces good atomization.

[0061] When the flow rate gradually increases, the oil supply pressure gradually increases, but the pressure generated by the fuel on both sides of the piston on the valve 2 is still not enough to push the spring. The fuel 10 only flows into the auxiliary oil chamber 1g of the nozzle housing 1 through the gap 11 formed between the main oil circuit valve seat 3 and the nozzle housing 1. At this time, the pressure generated by the fuel on both sides of the piston on the auxiliary valve 8 is enough to push the spring, so that the piston rod on the piston drives the piston body and the bushing to move until the position of the valve window on the piston body is no longer surrounded by the inner wall of the bushing. The fuel 10 will enter the outer auxiliary oil pipe 1d through the auxiliary oil chamber 1g, and finally flow out through the outer auxiliary nozzle 9 and produce good atomization.

[0062] When the flow rate increases further, the oil supply pressure increases further, and the pressure generated by the fuel 10 on both sides of the piston on the valve 2 is sufficient to push the spring, so that the piston rod on the piston drives the piston body to move relative to the bushing to increase the distance until the position of the valve window on the piston body is no longer surrounded by the inner wall of the bushing. The fuel 10 will flow through the oil hole of the bushing 2c and the valve window into the main oil pipe 1b of the nozzle housing 1, and finally flow out of the nozzle through the main nozzle 5 and produce good atomization under the shearing action of the swirling air in the inner air swirler 6 and the outer air swirler 7.

[0063] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A fuel nozzle structure for an aircraft engine combustion chamber, characterized in that: include: Nozzle housing (1), valve (2), main oil circuit valve seat (3), inner auxiliary nozzle (4), main nozzle (5), inner air swirler (6), outer air swirler (7), auxiliary oil circuit valve seat (8) and outer auxiliary nozzle (9); forming a normally open oil circuit, a first adjustable oil circuit and a second adjustable oil circuit; in, The normally open oil circuit comprises: an oil inlet hole (1a) located on the nozzle housing (1), a cavity formed by the nozzle housing (1) and communicating with the oil inlet hole (1a), and a first secondary oil circuit communicating between the cavity and the secondary nozzle; The first adjustable oil circuit comprises: the oil inlet hole (1a), the cavity, the first piston cavity connected to the cavity via the first piston cavity inlet, the first piston cavity outlet, and a second secondary oil circuit connected between the first piston cavity outlet and the secondary nozzle; wherein the first piston cavity is a cavity formed by the first valve housing and the first piston, the volume of which is changed by the movement of the first piston; the first piston cavity outlet comprises a first valve housing outlet located in the first valve housing and a first piston outlet located on the first piston, and when the first piston moves to a preset position, the first valve housing outlet is connected to the first piston outlet; The second adjustable oil circuit comprises: the oil inlet hole (1a), the cavity, the second piston chamber inlet, the second piston chamber, the second piston chamber outlet, and a main oil circuit connecting the second piston chamber outlet and the main nozzle (5); wherein the second piston chamber is a chamber formed by the second valve housing and the second piston, the volume of which can be changed by the movement of the second piston; the second piston chamber outlet comprises a second valve housing outlet located in the second valve housing and a second piston outlet located on the second piston, and when the second piston moves to a preset position, the second valve housing outlet is connected to the second piston outlet; The first piston and the second piston are pushed by the pressurized fuel entering the first piston chamber inlet and the second piston chamber inlet respectively, and the first piston and the second piston are respectively provided with a spring to resist the pushing; The first valve housing, the second valve housing, the first piston and the second piston together form a valve (2), wherein the first piston and the second piston are integrally formed into a secondary oil circuit piston body (202a) and a main oil circuit piston body (205a) at different axial positions on the piston rod (201a), the first valve housing and the second valve housing form a valve housing, the valve housing includes a bushing (2c) and a main oil circuit valve seat (3), the bushing (2c) has a guide cylinder for sleeve-mounting the center rod of the piston rod (201a), an inner wall (201c) of the secondary oil circuit bushing for sleeve-mounting the secondary oil circuit piston body (202a) and an inner wall (204c) of the main oil circuit bushing for sleeve-mounting the main oil circuit piston body (205a), the secondary oil circuit piston body ( The first piston chamber is formed by the main oil circuit piston body (205a) and the inner wall (204c) of the main oil circuit bushing; the second piston chamber is formed by the main oil circuit piston body (205a) and the inner wall (204c) of the main oil circuit bushing; the inlet of the first piston chamber is the oil hole (202c) on the bushing (2c); the outlet of the first valve housing is the bushing side wall oil hole (203c) on the inner wall (201c) of the auxiliary oil circuit bushing; the first piston chamber and the second piston chamber are communicated through the first oil hole (204a) located on the auxiliary oil circuit piston body (202a) and the second oil hole (206a) located on the main oil circuit piston body (205a).

2. The fuel nozzle structure for the combustion chamber of an aircraft engine according to claim 1, wherein: The first valve housing outlet comprises an annular groove provided on the inner wall (201c) of the auxiliary oil circuit bushing and an oil hole (203c) on the bushing side wall opened in the annular groove; the first piston outlet comprises an auxiliary oil circuit valve window (203a) provided on the side wall of the auxiliary oil circuit piston body (202a); when the auxiliary oil circuit valve window (203a) moves to the annular groove, the oil circuit is opened; The valve housing is sleeved on the auxiliary oil circuit valve seat (8), and the valve housing and the auxiliary oil circuit valve seat (8) form an annular cavity that isolates the cavity, and the first piston outlet is connected to the second auxiliary oil circuit through the annular cavity.

3. The fuel nozzle structure for the combustion chamber of an aircraft engine according to claim 2, wherein: The main oil circuit piston body (205a) is cylindrical, and a cylindrical second piston cavity is formed inside the main oil circuit piston body (205a). The second piston outlet is a main oil circuit valve window (207a) opened on the side wall of the main oil circuit piston body (205a). The inner wall (204c) of the main oil circuit bushing has an oil collecting ring groove. The main oil circuit valve window (207a) is connected to the oil collecting ring groove at a preset position. The bottom surface of the main oil circuit piston body (205a), the wall surface of the oil collecting ring groove and the main oil circuit valve seat (3) form a bottom cavity, and the bottom cavity is connected to the main oil circuit.

4. The fuel nozzle structure for the combustion chamber of an aircraft engine according to claim 3, wherein: The specific manner in which the bottom cavity is connected to the main oil circuit includes: the main oil circuit is arranged at the bottom of the cavity, a first joint recess is formed at the edge of the main oil circuit inlet, the outer side of the bottom of the auxiliary oil circuit valve seat (8) has a first joint protrusion plugged into the first joint recess, the inner side of the bottom of the auxiliary oil circuit valve seat (8) has a second joint recess, the bottom of the main oil circuit valve seat (3) has a second joint protrusion plugged into the second joint recess, and the bottom cavity is connected to the main oil circuit through a channel running through the second joint protrusion, the second joint recess, the first joint protrusion and the first joint recess.

5. The fuel nozzle structure for the combustion chamber of an aircraft engine according to claim 4, wherein: The inner wall surface of the cavity formed by the valve housing and the nozzle housing (1) forms a gap (11) through which the oil path is normally open.

6. The fuel nozzle structure for the combustion chamber of an aircraft engine according to claim 1, wherein: The auxiliary nozzle comprises an inner auxiliary nozzle (4) and an outer auxiliary nozzle (9) circumferentially arranged at the outer edge of the inner auxiliary nozzle (4); the normally open oil circuit is connected to the inner auxiliary nozzle (4); and the first adjustable oil circuit is connected to the outer auxiliary nozzle (9).

7. The fuel nozzle structure for the combustion chamber of an aircraft engine according to claim 2, wherein: The distance that the first piston outlet moves from the initial position to the first valve housing outlet position and is connected is shorter than the distance that the second piston outlet moves from the initial position to the second valve housing outlet position and is connected.

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