Starting fuel oil path structure of aero-engine

Abstract

The invention discloses an aero-engine starting fuel oil way structure which comprises an oil supply guide pipe, a pipe connecting piece, a starting main pipe guide pipe, an igniter and a recycling assembly, the pipe connecting piece is connected with the oil supply guide pipe, the starting main pipe guide pipe and the recycling assembly, one end of the starting main pipe guide pipe is connected with the igniter, and the other end of the starting main pipe guide pipe is connected with the igniter. The igniter is installed on an engine combustion chamber casing. Through the arrangement of the throttling nozzle on the pipe connecting piece, rapid filling of fuel oil can be achieved, the fuel oil filling time of a starting oil way is shortened, and rapid ignition of the igniter is achieved; residual fuel oil is blown to an oil leakage tank by designing a blowing guide pipe of the starting main pipe, so that carbon deposition of the fuel oil in a starting nozzle and a pipeline is prevented; a pipe joint pipeline with threads is formed by a jacket nut, a flat pipe nozzle, a pipe joint and a flaring pipe, and reliable sealing connection between the pipe joint pipeline with threads, a four-way pipe joint with a throttling nozzle and a starting nozzle in an igniter is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation engines, and in particular relates to an aviation engine starting fuel oil circuit structure. Background Art

[0002] With the development of the aviation industry and the continuous improvement of aircraft engine performance, the controllability of the ignition process is a crucial issue in the design of aircraft engine combustion chambers. How to achieve good ignition performance under a wide range of operating conditions is one of the key issues in the design of aircraft engine combustion chamber components. In order to ensure the ignition stability of the engine under various conditions, the efficiency, stability and reliability of its starting oil circuit system will become particularly important. The traditional starting oil circuit design is relatively simple and does not take into account functions such as rapid filling and clearing of fuel. The stability of its ignition oil circuit is poor. After long-term use, the starting nozzle and starting pipe are prone to carbon deposits and blockage, resulting in poor ignition performance of the igniter, affecting the starting performance of the engine. Therefore, in order to achieve rapid oil flushing of the starting oil circuit system and the removal of residual fuel after the oil supply is stopped, it is necessary to propose a new high-reliability starting fuel circuit structure with a blow-off system.

[0003] Patent application CN103603727A discloses a turboshaft engine starting fuel control system comprising a main fuel circuit, a starting fuel circuit, and a return circuit. This structure connects each valve to the return circuit via the main and starting fuel circuits, effectively reducing the number of valve components and fuel pipes, simplifying the structure, reducing parts count, and lowering maintenance costs for the starting fuel control system. However, this structure does not address the removal of residual fuel after fuel supply is shut off. The system's shut-down return valve directly returns fuel to the tank, but is not suitable for direct return of fuel contaminated with impurities. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides an aircraft engine starting fuel oil circuit structure.

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

[0006] The present invention provides an aircraft engine starting fuel oil circuit, comprising an oil supply conduit, a pipe connector, a starting manifold conduit, an igniter, and a recovery assembly. The pipe connector is connected to the oil supply conduit, the starting manifold conduit, and the recovery assembly, respectively. One end of the starting manifold conduit is connected to the igniter, and the igniter is mounted on the engine combustion chamber casing.

[0007] Preferably, the pipe connector is a four-way pipe joint, a filter element and an elastic element are arranged in the pipe connector, and one end of the filter element is connected to the elastic element.

[0008] Preferably, the filter element is columnar, a groove is provided at one end of the filter element, and a thread is provided on the outer wall of the filter element.

[0009] Preferably, a connecting piece is provided on the pipe connector, and a threaded hole is provided on the connecting piece.

[0010] Preferably, a pipe joint and a flat portion are provided on the pipe connector.

[0011] Preferably, a throttle nozzle is provided on the pipe connector.

[0012] Preferably, the recovery assembly includes a main pipe blow-off pipe and an oil leakage tank, and the pipe connector is connected via the main pipe blow-off pipe and the oil leakage tank.

[0013] Preferably, the starting manifold conduit includes an outer sleeve nut, a nozzle, a pipe joint and a main pipe, the end of the main pipe is connected to the nozzle or the pipe joint, the nozzle is threadedly connected to the outer sleeve nut, and the starting manifold conduit is connected to the pipe connector and the igniter through the outer sleeve nut.

[0014] Preferably, the nozzle includes a pipe sleeve and a connector, the pipe sleeve and the connector are connected, the pipe sleeve is sleeved on the outer wall of the main pipe, and the outer wall of the connector is provided with an external thread.

[0015] Preferably, one end of the main connecting nozzle is flared.

[0016] The beneficial effects of the present invention are:

[0017] The present invention can realize rapid fuel filling, shorten the fuel filling time of the starting oil circuit, and realize rapid ignition of the igniter by arranging the throttle nozzle on the pipe connector; by designing the starting main pipe blow-off duct, the remaining fuel can be blown off to the oil leakage tank, thereby preventing the fuel from generating carbon deposits in the starting nozzle and the pipeline; the outer sleeve nut, flat pipe nozzle, pipe joint and flared pipe are used to form a threaded pipe joint pipeline, thereby realizing a sealed and reliable connection between the threaded pipe joint pipeline, the four-way pipe joint with the throttle nozzle, and the starting nozzle in the igniter. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 yes Figure 1 A schematic structural diagram of the pipe connector in region I;

[0020] Figure 3 yes Figure 2 Schematic diagram of the II region structure;

[0021] Figure 4 It is a structural schematic diagram of the pipe connector of the present invention;

[0022] Figure 5 It is a schematic structural diagram of the filter element of the present invention;

[0023] Figure 6 This is a schematic diagram of the oil supply conduit structure provided with a nozzle and a pipe joint according to the present invention;

[0024] Figure 7 This is a schematic diagram of the structure of the oil supply conduit without a pipe joint in the present invention;

[0025] Figure 8 It is a structural schematic diagram of the nozzle of the present invention;

[0026] In the figure: 1- oil supply conduit, 2- pipe connector, 21- filter element, 211- groove, 22- elastic member, 23- connecting piece, 24- threaded hole, 25- throttle nozzle, 26- flat portion, 3- starting main pipe conduit, 4- igniter, 5- main pipe blow-off pipe, 6- oil leakage box, 7- outer nut, 8- nozzle, 81- pipe sleeve, 82- connector, 9- pipe joint, 10- main pipe. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0028] Example:

[0029] like Figures 1 to 8 As shown, an aircraft engine starting fuel oil circuit structure includes an oil supply conduit 1, a pipe connector 2, a starting manifold conduit 3, an igniter 4 and a recovery assembly. The pipe connector 2 is connected to the oil supply conduit 1, the starting manifold conduit 3 and the recovery assembly respectively. One end of the starting manifold conduit 3 is connected to the igniter 4, and the igniter 4 is installed on the engine combustion chamber casing.

[0030] The pipe connector 2 is a four-way pipe connector. A filter 21 and an elastic member 22 are disposed within the pipe connector 2. One end of the filter 21 is connected to the elastic member 22. The elastic member 22 secures the filter 21. The filter 21 is disposed on the side of the pipe connector 2 where it connects to the main pipe blow-off pipe 5. This provides a certain barrier to the fuel, ensuring that most of the fuel flows through the starting main pipe conduit 3 to the starting nozzle in the igniter 4.

[0031] The filter element 21 is columnar, and a groove 211 is provided at one end of the filter element 21. The provision of the groove 211 facilitates the flow of fuel to the thread. The outer wall of the filter element 21 is provided with a thread, which blocks impurities and plays a filtering role.

[0032] The pipe connector 2 is provided with a connector 23 , and the connector 23 is provided with a threaded hole 24 , which can be used to fix the pipe connector 2 on the engine by using screws, and at the same time fix the position of the pipe connected to the pipe connector 2 .

[0033] The pipe connector 2 is provided with a pipe joint 9 and a flat portion 26. The pipe connector 2 can be connected to other pipes through the pipe joint 9. The flow of liquid on the pipe connector 2 is as follows. Figure 2 As shown by the arrows, the fuel enters the pipe connector 2 from the left end and then flows out from the other three joints of the pipe connector 2. The arrangement of the flat portion 26 facilitates the use of tools to clamp the pipe connector 2 for rotation during installation.

[0034] The pipe connector 2 is provided with a throttle 25. Its primary function is to rapidly eject the fuel from the pipeline by allowing high-pressure fluid to pass through it during fuel supply. The reduced area of ​​the throttle 25 increases the fluid's velocity after passing through it, thereby achieving rapid fuel injection. The principle is that when a fluid (gas or liquid) flows through a suddenly narrowing cross-section (the throttle 25), its velocity increases. According to Bernoulli's principle, this increased velocity causes a sharp drop in static pressure at that location.

[0035] The recovery assembly includes a main pipe blow-off pipe 5 and an oil leakage tank 6, and the pipe connector 2 is connected via the main pipe blow-off pipe 5 and the oil leakage tank 6.

[0036] The starting manifold conduit 3 is composed of an outer sleeve nut 7, a nozzle 8, a pipe joint 9 and a main pipe 10. The end of the main pipe 10 is connected to the nozzle 8 or the pipe joint 9. The nozzle 8 is threadedly connected to the outer sleeve nut 7. The starting manifold conduit 3 is connected to the pipe connector 2 and the igniter 4 through the outer sleeve nut 7.

[0037] The oil supply conduit 1 and manifold blow-off pipe 5 also consist of an outer nut 7, nozzle 8, pipe joint 9, and main pipe 10. They are connected in the same manner as the starting manifold conduit 3, using outer nut 7 or pipe joint 9 to connect to other structures as needed. The oil supply conduit 1 and manifold blow-off pipe 5 are connected to the pipe connector 2 via outer nut 7.

[0038] When the oil supply conduit 1, the starting main pipe conduit 3 and the main pipe blow-off pipe 5 need to be spliced ​​and lengthened, a pipe joint 9 can be provided on one section of the main pipe 10, and an outer sleeve nut 7 and a nozzle 8 can be provided on the other section of the main pipe 10. The two sections of the pipe can be spliced ​​and sealed by connecting the pipe joint 9 with the outer sleeve nut 7.

[0039] The nozzle 8 includes a pipe sleeve 81 and a connector 82 , which are connected. The pipe sleeve 81 is sleeved on the outer wall of the main pipe 10 , and the outer wall of the connector 82 is provided with an external thread, which can be threadedly connected to the outer sleeve nut 7 .

[0040] One end of the main pipe 10 connected to the nozzle 8 is flared.

[0041] How to run:

[0042] During engine operation, the starting fuel circuit system delivers fuel along the fuel supply conduit 1 through the throttled four-way pipe joint 2 to the starting manifold conduit 3 and the starting nozzle of the igniter 4. The throttle 25 in the four-way pipe joint 2 ensures rapid fuel injection, ensuring rapid fuel filling of the starting nozzle circuit and rapid ignition of the igniter. Simultaneously, the starting manifold blow-off pipe 5 is filled. After the starting fuel supply is stopped, to prevent carbon deposits from forming inside the starting manifold conduit 3 and the starting nozzle passage of the igniter 4, air from two combustion chamber passages—the airflow from the igniter 4 where it is assembled to the combustion chamber, and the airflow from the passage formed by the combustion chamber casing and the flame tube—is fed through the air inlet holes in the igniter 4 and into the igniter 4, where it atomizes and ignites the fuel. Air is continuously blown into the starting nozzle in the igniter 4 and the starting manifold conduit 3 until any remaining fuel passes through the throttled four-way pipe joint 2 and the starting manifold blow-off pipe 5 and into the oil leak tank 6.

Claims

1. An aircraft engine starting fuel oil circuit structure, characterized by: The invention comprises an oil supply conduit (1), a pipe connector (2), a starting main pipe conduit (3), an igniter (4) and a recovery assembly, wherein the pipe connector (2) is connected to the oil supply conduit (1), the starting main pipe conduit (3) and the recovery assembly respectively, one end of the starting main pipe conduit (3) is connected to the igniter (4), and the igniter (4) is mounted on the engine combustion chamber casing.

2. The aircraft engine starting fuel oil circuit structure according to claim 1, characterized in that: The pipe connector (2) is a four-way pipe joint. A filter element (21) and an elastic element (22) are arranged inside the pipe connector (2). One end of the filter element (21) is connected to the elastic element (22).

3. The aircraft engine starting fuel oil circuit structure according to claim 2, characterized in that: The filter element (21) is columnar, a groove (211) is provided at one end of the filter element (21), and a thread is provided on the outer wall of the filter element (21).

4. The aircraft engine starting fuel oil circuit structure according to claim 1, characterized in that: A connecting piece (23) is provided on the pipe connecting piece (2), and a threaded hole (24) is provided on the connecting piece (23).

5. The aircraft engine starting fuel oil circuit structure according to claim 1, characterized in that: The pipe connector (2) is provided with a pipe joint (9) and a flat portion (26).

6. The aircraft engine starting fuel oil circuit structure according to claim 1, characterized in that: A throttle nozzle (25) is provided on the pipe connector (2).

7. The aircraft engine starting fuel oil circuit structure according to claim 1, characterized in that: The recovery assembly comprises a main pipe blow-off pipe (5) and an oil leakage tank (6), and the pipe connector (2) is connected via the main pipe blow-off pipe (5) and the oil leakage tank (6).

8. The aircraft engine starting fuel oil circuit structure according to claim 1, characterized in that: The starting main pipe conduit (3) comprises an outer sleeve nut (7), a nozzle (8), a pipe joint (9) and a main pipe (10). The end of the main pipe (10) is connected to the nozzle (8) or the pipe joint (9). The nozzle (8) is threadedly connected to the outer sleeve nut (7). The starting main pipe conduit (3) is connected to the pipe joint (2) and the igniter (4) through the outer sleeve nut (7).

9. The aircraft engine starting fuel oil circuit structure according to claim 8, characterized in that: The nozzle (8) comprises a pipe sleeve (81) and a connector (82), the pipe sleeve (81) and the connector (82) are connected, the pipe sleeve (81) is sleeved on the outer wall of the main pipe (10), and the outer wall of the connector (82) is provided with an external thread.

10. The aircraft engine starting fuel oil circuit structure according to claim 8, characterized in that: One end of the main pipe (10) connected to the nozzle (8) is flared.

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