High-reliability starting nozzle suitable for low-temperature ignition

Abstract

The invention discloses a high-reliability starting nozzle suitable for low-temperature ignition. The high-reliability starting nozzle suitable for low-temperature ignition comprises a starting nozzle body, wherein a swirler can be conveniently disassembled from a nozzle shell to be maintained. Comprising a nozzle shell provided with a fuel oil main runner hole. The swirler is pressed in the fuel oil main runner hole through a spring; and a bushing mounted within the nozzle housing to compress the spring. The structure is simple and convenient, the debugging difficulty and the manufacturing cost are greatly reduced, factors interfering the performance of the nozzle are reduced, and the stability and the reliability of the performance at different temperatures are ensured; by means of the pressing mode of the lining, the limiting groove and the spring, part damage caused by conventional locking depending on local sunken deformation of the part is avoided, the problem that the number of times of disassembly is limited is solved, and maintainability is improved.

Description

Technical Field

[0001] The invention relates to a high-reliability starting nozzle suitable for low-temperature ignition, belonging to the technical field of aviation engines. Background Art

[0002] The low temperature ignition performance of the main combustion chamber is one of the important indicators of aircraft engines, which directly affects the functional realization and reliable use of the engine. The main combustion chamber ignition is mainly divided into two ignition forms: direct ignition and indirect ignition. Indirect ignition usually requires a special starting nozzle.

[0003] Existing starting nozzle installation structure is as follows Figure 5 As shown, the cyclone 8 is installed in the nozzle 6, and the end of the cyclone 8 away from the nozzle 6 is installed with a core rod 5 and a spring 1. The nozzle 6 is connected to the bushing 9 to accommodate the core rod 5 and the spring 1. The nozzle 6 and the bushing 9 are installed in the nozzle housing 2 through the ring 3 and the screw plug 7. Although the cyclone 8 can be installed in the nozzle housing 2, when the oil debris is blocked and the cyclone 8 needs to be disassembled for cleaning, the seven parts of the screw plug 7, the ring 3, the nozzle 6, the bushing 9, the spring 1 and the core rod 5 need to be disassembled in sequence. Due to the large number of parts, the structure becomes complicated, the debugging difficulty and manufacturing cost are large, and there are many factors that interfere with the nozzle performance, which is not conducive to the stability and reliability of the nozzle performance. Relying on the local concave deformation of the right end of the nozzle housing for locking will cause damage to the parts, there is a problem of limited disassembly times, and the maintainability is reduced. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a high-reliability starting nozzle suitable for low-temperature ignition.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a high-reliability starting nozzle suitable for low-temperature ignition, comprising: a starting nozzle that is convenient for disassembling a swirler from a nozzle housing for maintenance.

[0007] It includes a nozzle housing provided with a main fuel flow passage hole;

[0008] It also includes a swirler pressed into the main fuel channel hole by a spring; and a bushing installed in the nozzle housing to compress the spring.

[0009] The nozzle housing far away from the main fuel channel hole is provided with a nozzle for spraying oil, and the main fuel channel hole is communicated with the nozzle.

[0010] A limiting groove for accommodating the bushing boss outside the bushing is provided inside the nozzle housing; a mounting groove for the bushing boss to slide into is provided at the end of the nozzle housing, and the bushing boss abuts against the mounting groove of the nozzle housing.

[0011] The end of the nozzle housing with the mounting groove is a conical surface.

[0012] The swirler is provided with an inner flow channel of the swirler connected to the main flow channel hole of the fuel oil inside; the swirler is symmetrically provided with an outer flow channel of the swirler outside; the swirler is provided with a side wall hole connecting the outer flow channel of the swirler and the inner flow channel of the swirler; the swirler close to the nozzle is provided with a swirl groove, and the swirl groove and the nozzle form a complete swirl chamber.

[0013] The end of the bushing is provided with a drainage groove corresponding to the mounting groove.

[0014] The outside of the bushing is integrally fixed with symmetrically distributed bushing bosses extending therefrom, and the bushing bosses are used to abut against the mounting groove of the nozzle housing for axial limitation.

[0015] The beneficial effects of the present invention are as follows: when the swirler needs to be disassembled from the nozzle housing for maintenance, the swirler can be disassembled from the nozzle housing by disassembling the two parts, the bushing and the spring, from the nozzle housing in sequence; the structure is simple, the debugging difficulty and the manufacturing cost are greatly reduced, the factors interfering with the nozzle performance are reduced, and the stability and reliability of the performance at different temperatures are guaranteed; the clamping method of the bushing, the limit groove and the spring avoids the damage to the parts caused by the conventional locking method that relies on the local depression and deformation of the parts, solves the problem of the limitation of the number of disassembly times, and improves the maintainability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a cross-sectional schematic diagram of the present invention;

[0017] Figure 2 It is a schematic structural diagram of the nozzle housing of the present invention;

[0018] Figure 3 It is a schematic diagram of the structure of the cyclone of the present invention;

[0019] Figure 4 It is a structural schematic diagram of the bushing of the present invention;

[0020] Figure 5 It is a cross-sectional schematic diagram of the prior art;

[0021] In the figure: 1-spring; 2-nozzle housing; 21-fuel main flow channel hole; 22-limiting groove; 23-installing groove; 24-spray; 3-ring; 4-adjusting washer; 5-core rod; 6-nozzle; 7-screw plug; 8-swirler; side wall hole; 82-swirl groove; 83-swirler outer flow channel; 9-bushing; 91-bushing boss. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0023] like Figures 1 to 4 shown.

[0024] The present application discloses a high-reliability starting nozzle suitable for low-temperature ignition, which can ensure reliable ignition of the engine in a low-temperature environment of -35°C, including:

[0025] A nozzle housing 2 is provided with a fuel main flow channel hole 21 inside; the nozzle housing 2 away from the fuel main flow channel hole 21 is provided with a nozzle 24 for spraying oil, and the fuel main flow channel hole 21 is connected with the nozzle 24; a limiting groove 22 is provided inside the nozzle housing 2 to accommodate the outer bushing boss 91 of the bushing 9; a mounting groove 23 is provided at the end of the nozzle housing 2, and the bushing boss 91 of the bushing 9 slides in through the mounting groove 23. After the bushing 9 slides into the nozzle housing 2, it rotates and abuts against the inside of the nozzle housing 2 through the bushing boss 91. The end of the nozzle housing 2 with the mounting groove 23 is a conical surface, which is convenient for matching with the ball head of the oil supply pipeline to ensure the sealing of the connection.

[0026] The swirler 8 is also provided with a swirler 8 pressed into the main fuel channel hole 21 by a spring 1; the swirler 8 is provided with an inner swirler flow channel connected to the main fuel channel hole 21; the swirler 8 is symmetrically provided with an outer swirler flow channel 83 outside; the swirler 8 is provided with a side wall hole 81 connecting the outer swirler flow channel 83 with the inner swirler flow channel; the swirler 8 close to the nozzle 24 is provided with a swirl groove 82, and the swirl groove 82 and the nozzle 24 form a complete swirl chamber.

[0027] It also includes a bushing 9 with a center hole inside, and a drainage groove 92 at the end of the bushing 9 corresponding to the mounting groove 23, and the drainage groove 92 can be used to guide the fuel to enter; the bushing 9 is integrally and integrally extended with symmetrically distributed bushing bosses 91 on the outside, and the bushing bosses 91 are used to abut against the mounting groove 23 of the nozzle housing 2 for axial limitation.

[0028] When the swirler 8 needs to be disassembled from the nozzle housing 2 for maintenance, the bushing 9 and the spring 1 are disassembled from the nozzle housing 2 in sequence, and the swirler 8 can be disassembled from the nozzle housing 2, which can improve the maintenance efficiency and solve the problem of too many parts needing to be disassembled affecting the maintenance efficiency.

[0029] The spring 1 presses the swirler 8 in the nozzle housing 2, and the bushing 9 presses against the mounting groove 23 of the nozzle housing 2 through the bushing boss 91. The fuel flows in from the center hole of the bushing 9, flows through the spring 1, flows from the inner flow channel of the swirler to the outer flow channel 83 of the outer swirler through the side wall hole 81 on the swirler 8, flows to the swirl chamber through the tangential swirl groove 82, and then sprays out the centrifugal oil mist from the nozzle 24 of the nozzle housing 2. The bushing 9 rests in the limit groove 22 of the nozzle housing 2, and the bushing 9 compresses the spring 1 to press the swirler 8 tightly against the nozzle housing 2, forming a complete swirl chamber with the cone angle of the nozzle housing 2 with the nozzle, thereby realizing the assembly and compression of the corresponding parts. The technical solution of the present application has a simple structure, greatly reduces the difficulty of debugging and manufacturing costs, reduces factors interfering with nozzle performance, and ensures the stability and reliability of performance at different temperatures; the clamping method of the bushing, limit groove, and spring avoids the damage to parts caused by the conventional locking method that relies on local concave deformation of parts, solves the problem of limited disassembly times, and improves maintainability.

Claims

1. A high-reliability starting nozzle suitable for low-temperature ignition, characterized in that: include: A starting nozzle is provided which facilitates the disassembly of a swirler (8) from a nozzle housing (2) for maintenance.

2. The high-reliability starting nozzle suitable for low-temperature ignition according to claim 1, characterized in that: It comprises a nozzle housing (2) provided with a main fuel flow channel hole (21); It also includes a swirler (8) pressed into a fuel main flow channel hole (21) by a spring (1); and a bushing (9) installed in a nozzle housing (2) to compress the spring (1).

3. The starting nozzle suitable for low temperature ignition and high reliability as claimed in claim 2, characterized in that: The nozzle housing (2) away from the main fuel channel hole (21) is provided with a nozzle (24) for spraying oil, and the main fuel channel hole (21) is connected to the nozzle (24).

4. The starting nozzle suitable for low temperature ignition with high reliability as claimed in claim 3, characterized in that: The nozzle housing (2) is provided with a limiting groove (22) inside for accommodating the outer bushing boss (91) of the bushing (9); the end of the nozzle housing (2) is provided with a mounting groove (23) for the bushing boss (91) to slide into, and the bushing boss (91) is abutted against the mounting groove (23) of the nozzle housing (2).

5. The starting nozzle suitable for low temperature ignition and high reliability as claimed in claim 4, characterized in that: The end of the nozzle housing (2) having the mounting groove (23) is a conical surface.

6. The high-reliability starting nozzle suitable for low-temperature ignition according to claim 2, characterized in that: The swirler (8) is provided with an inner swirler flow channel connected to the main fuel flow channel hole (21); the swirler (8) is symmetrically provided with an outer swirler flow channel (83) outside the swirler (8); the swirler (8) is provided with a side wall hole (81) connecting the outer swirler flow channel (83) and the inner swirler flow channel; the swirler (8) close to the nozzle (24) is provided with a swirl groove (82); the swirl groove (82) and the nozzle (24) form a complete swirl chamber.

7. The high-reliability starting nozzle suitable for low-temperature ignition according to claim 2, characterized in that: The end of the bushing (9) corresponds to a drainage groove (92) of the mounting groove (23).

8. The high-reliability starting nozzle suitable for low-temperature ignition according to claim 7, characterized in that: The bushing (9) is integrally and fixedly provided with symmetrically distributed bushing bosses (91) extending from the outside. The bushing bosses (91) are used to abut against the mounting groove (23) of the nozzle housing (2) for axial limiting.

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