A constant pressure oil supply device applied to a turbojet engine

Abstract

This invention belongs to the field of fluid pressure control technology, and particularly relates to a constant pressure fuel supply device for turbojet engines, comprising a valve seat, a constant pressure component, and a cover plate. The valve seat has a cavity in the middle, and a main oil outlet is coaxially opened at the bottom end of the valve seat. A circular tube is coaxially fixedly connected to the inner bottom wall of the cavity, and the circular tube communicates with the main oil outlet. The constant pressure component is mounted on the circular tube and is used to control the pressure of the oil inside the circular tube. The cavity is divided into annular chambers by the circular tube. The bottom end of the valve seat also has an oil inlet and a constant pressure oil outlet, both of which communicate with the annular chambers. A solenoid valve is installed on the constant pressure oil outlet to control the opening and closing of the constant pressure oil outlet, and the solenoid valve is electrically connected to the electronic control unit on the turbojet engine. The constant pressure component is sealed and fixed inside the cavity by the cover plate. This invention can reduce the amount of fuel pump used, save space, and ensure constant oil pressure in the ignition fuel circuit.

Description

Technical Field

[0001] This utility model belongs to the field of fluid pressure control technology, and in particular relates to a constant pressure fuel supply device for turbojet engines. Background Technology

[0002] Turbojet engines, also known as turbojet engines, are high thrust-to-weight ratio power plants with extremely compact internal space. The starting process of a turbojet engine consists of an initial ignition phase and a sustained combustion phase. Typically, oil pumps are installed in both the ignition oil circuit and the main oil circuit. The oil pressure in these circuits is controlled separately according to the ignition strategy of the turbojet engine's ECU (Electronic Control Unit) to achieve starting and stable operation.

[0003] Such a setup requires two oil pumps, which takes up space in the engine's core area and affects the layout optimization of other components (such as the combustion chamber and turbine).

[0004] Therefore, there is a need to provide a constant pressure fuel supply device for turbojet engines to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a constant pressure fuel supply device for turbojet engines to solve the problems existing in the prior art.

[0006] To achieve the above objectives, this utility model provides a constant pressure fuel supply device for a turbojet engine, comprising a valve seat, a constant pressure component, and a cover plate. The valve seat has a cavity in its center, and a main oil outlet is coaxially formed at its bottom end. A circular tube is coaxially fixed to the inner bottom wall of the cavity, communicating with the main oil outlet. The cavity is divided into an annular cavity by the circular tube. The constant pressure component is mounted on the circular tube and is used to control the pressure of the oil in the annular cavity. The bottom end of the valve seat also has an oil inlet and a constant pressure oil outlet, both communicating with the annular cavity. A solenoid valve is mounted on the constant pressure oil outlet, controlling its opening and closing. The solenoid valve is electrically connected to the electronic control unit on the turbojet engine. The constant pressure component is sealed and fixed within the cavity by the cover plate.

[0007] Preferably, the constant pressure assembly includes a mounting base, which is cylindrical and has an internal receiving groove. The top end of a plunger rod is slidably connected to the inner bottom wall of the mounting base. The plunger rod has a T-shaped structure and a through hole is coaxially formed on it. The plunger rod is coaxially arranged with the circular tube, and the top cap of the plunger rod is sealed to the circular tube. An elastic element is provided on the inner top wall of the mounting base, and the plunger rod is elastically connected to the mounting base through the elastic element.

[0008] Preferably, the elastic element is a spring.

[0009] Preferably, the valve seat has a slot at its top, and a limiting ring is fixedly sleeved on the outer wall of the mounting base. The limiting ring is adapted to the slot, and the limiting ring is pressed and fixed in the slot by the cover plate.

[0010] Preferably, a first sealing ring is fitted on the outer wall of the mounting base, and the mounting base seals the cavity on the valve seat through the first sealing ring.

[0011] Preferably, a second sealing ring is provided between the top cap of the plunger rod and the end face of the circular tube.

[0012] Preferably, the oil inlet, the main oil outlet, and the constant pressure oil outlet are all provided with internal threads.

[0013] Compared with the prior art, the present invention has the following advantages and technical effects:

[0014] This invention provides a constant-pressure fuel supply device for a turbojet engine. The inlet is connected to the fuel pump on the fuel tank, the constant-pressure outlet is connected to the ignition fuel circuit of the turbojet engine, and the main outlet is connected to the main fuel circuit of the turbojet engine. A solenoid valve controls the opening and closing of the ignition fuel circuit according to the fuel supply and ignition strategy of the electronic control unit on the turbojet engine. A constant-pressure component ensures stable fuel pressure at the constant-pressure outlet, guaranteeing constant fuel pressure in the ignition fuel circuit during both the initial ignition and continuous combustion phases. Simultaneously, both the inlet 12 and the constant-pressure outlet 2 are connected to an annular cavity, forming a pressure buffer zone to further improve the constant-pressure performance. A single fuel pump can simultaneously supply fuel to both the ignition fuel circuit and the main fuel circuit. The valve seat integrates key components such as the cavity, circular tube, inlet, and constant-pressure outlet. The circular tube divides the cavity into an annular cavity and the main fuel circuit, significantly reducing the number of external pipes and connectors. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a cross-sectional schematic diagram of the constant pressure oil supply device in this practical application;

[0017] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0018] The components are: 1. Solenoid valve; 2. Constant pressure oil outlet; 3. Round tube; 4. Piston rod; 5. Through hole; 6. Valve seat; 7. Cover plate; 8. Mounting seat; 9. Spring; 10. Limiting retaining ring; 11. First sealing ring; 12. Oil inlet; 13. Main oil outlet; 14. Second sealing ring. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Reference Figures 1 to 2 As shown, this utility model provides a constant pressure oil supply device for a turbojet engine, including a valve seat 6, a constant pressure component, and a cover plate 7. The valve seat 6 has a cavity in the middle, and a main oil outlet 13 is coaxially opened at the bottom end of the valve seat 6. A circular tube 3 is coaxially fixedly connected to the inner bottom wall of the cavity, and the circular tube 3 communicates with the main oil outlet 13. The cavity is divided into an annular cavity by the circular tube 3. The constant pressure component is installed on the circular tube 3 and is used to control the pressure of the oil in the annular cavity. The bottom end of the valve seat 6 also has an oil inlet 12 and a constant pressure oil outlet 2. Both the oil inlet 12 and the constant pressure oil outlet 2 are connected to the annular cavity. A solenoid valve 1 is installed on the constant pressure oil outlet 2 and is used to control the opening and closing of the constant pressure oil outlet 2. The solenoid valve 1 is electrically connected to the electronic control unit on the turbojet engine. The constant pressure component is sealed and fixed in the cavity by the cover plate 7.

[0022] In use, this invention connects the oil inlet 12 to the fuel pump on the fuel tank, the constant pressure oil outlet 2 to the ignition oil circuit of the turbojet engine, and the main oil outlet 13 to the main oil circuit of the turbojet engine. The solenoid valve 1 controls the opening and closing of the ignition oil circuit according to the fuel supply and ignition strategy of the electronic control unit on the turbojet engine. The constant pressure component ensures stable oil pressure at the constant pressure oil outlet 2, ensuring constant oil pressure in the ignition oil circuit during both the initial ignition stage and the continuous combustion stage. Simultaneously, both the oil inlet 12 and the constant pressure oil outlet 2 are connected to the annular cavity, forming a pressure buffer area to further improve the constant pressure performance. A single oil pump can simultaneously supply oil to both the ignition oil circuit and the main oil circuit. The valve seat 6 integrates key components such as the cavity, the circular pipe 3, the oil inlet 12, and the constant pressure oil outlet 2. The circular pipe 3 divides the cavity into an annular cavity and the main oil circuit, significantly reducing the number of external pipes and connectors.

[0023] Furthermore, the constant pressure assembly includes a mounting base 8, which is a cylinder with an internal receiving groove. The top end of a plunger rod 4 is slidably connected to the inner bottom wall of the mounting base 8. The plunger rod 4 has a T-shaped structure and a through hole 5 is coaxially opened on it. The plunger rod 4 is coaxially arranged with the round tube 3, and the top cap of the plunger rod 4 is sealed to the round tube 3. An elastic element is provided on the inner top wall of the mounting base 8, and the plunger rod 4 is elastically connected to the mounting base 8 through the elastic element.

[0024] Specifically, during the initial ignition stage, the main oil circuit does not require oil supply, and the oil pressure in the annular cavity is less than the pressure of the elastic element. The plunger rod 4 is pressed against the end face of the round tube 3 for sealing. At this time, the pressure of the constant pressure oil outlet 2 is equal to the pressure of the oil inlet 12 and meets the ignition pressure in the ignition oil circuit. When entering the continuous combustion stage, the main oil circuit and the ignition oil circuit need to be supplied with oil simultaneously. The oil pump increases its operating power according to the strategy of the electronic control unit. At this time, the oil pressure in the annular cavity increases and squeezes the elastic element to separate the plunger rod 4 from the round tube 3. The purpose of setting the through hole 5 is to relieve pressure and ensure that the plunger rod 4 can move upward smoothly. Part of the oil in the annular cavity enters the main oil outlet 13 from the round tube 3 to supply oil to the main oil circuit, while ensuring that the oil pressure of the constant pressure oil outlet 2 is constant.

[0025] Furthermore, the elastic element is spring 9.

[0026] In this embodiment, spring 9 is made of Inconel 718 high-temperature alloy.

[0027] Furthermore, to facilitate disassembly and maintenance, a groove is provided at the top of the valve seat 6, and a limiting ring 10 is fixedly sleeved on the outer wall of the mounting base 8. The limiting ring 10 is adapted to the groove, and the limiting ring 10 is pressed and fixed in the groove by the cover plate 7.

[0028] Furthermore, in order to improve the sealing performance, a first sealing ring 11 is fitted on the outer wall of the mounting base 8, and the mounting base 8 seals the cavity on the valve seat 6 through the first sealing ring 11.

[0029] Furthermore, to improve sealing, a second sealing ring 14 is provided between the top cap of the plunger rod 4 and the end face of the round tube 3.

[0030] Furthermore, to facilitate connection with the oil pipe, internal threads are provided at the ports of the oil inlet 12, the main oil outlet 13, and the constant pressure oil outlet 2.

[0031] The constant pressure fuel supply device for turbojet engines provided by this utility model works as follows: During use, the fuel inlet 12 is connected to the fuel pump on the fuel tank, the constant pressure fuel outlet 2 is connected to the ignition fuel circuit on the turbojet engine, and the main fuel outlet 13 is connected to the main fuel circuit of the turbojet engine. The solenoid valve 1 controls the opening and closing of the ignition fuel circuit according to the fuel supply and ignition strategy of the electronic control unit on the turbojet engine. During the initial ignition stage, the main fuel circuit does not require fuel supply, and the oil pressure in the annular cavity is less than the elastic force of the spring 9. The plunger rod 4 presses against the circular tube 3. The end face is sealed. At this time, the pressure of the constant pressure oil outlet 2 is equal to the pressure of the oil inlet 12, and meets the ignition pressure in the ignition oil circuit. When entering the continuous combustion stage, it is necessary to supply oil to the main oil circuit and the ignition oil circuit at the same time. The oil pump increases the operating power according to the strategy of the electronic control unit. At this time, the oil pressure in the annular cavity increases and squeezes the spring 9 to compress it, so that the plunger rod 4 separates from the round tube 3. Part of the oil in the annular cavity enters the main oil outlet 13 from the round tube 3 to supply oil to the main oil circuit, while ensuring that the oil pressure of the constant pressure oil outlet 2 is constant.

[0032] The following example illustrates this: The pressure of spring 9 can be replaced with different specifications such as 0.3 MPa or 0.4 MPa according to actual usage requirements. When a 0.3 MPa pressure spring is selected, during the initial ignition stage, when the oil pressure at the inlet 12 is 0.2-0.26 MPa, the pressure at the constant pressure outlet 2 is equal to the pressure at the inlet 12. The fuel injector forms atomization, and the main outlet 13 is in a closed state. When entering the continuous combustion stage, the main outlet 13 needs to be supplied with fuel. At this time, when the oil pressure at the inlet 12... When the pressure is greater than 0.3 MPa, the main oil outlet is opened by the oil pressure due to the spring pressure of 0.3 MPa. A gap appears between the plunger rod 4 and the end face of the round tube 3 for oil supply. At this time, the pressure of the constant pressure oil outlet 2 is 0.3 MPa. For example, when the pressure of the oil inlet 12 reaches 0.4 MPa, the oil pressure fluctuation on the oil inlet 12 is absorbed by the spring 9, and the pressure of the constant pressure oil outlet 2 is still 0.3 MPa, thus realizing constant pressure oil supply in the ignition oil circuit. The oil flowing out with a pressure greater than the set pressure is supplied to the main oil circuit to meet the oil supply needs of the turbojet engine.

[0033] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A constant pressure oil supply device for a turbojet engine, characterized in that, The system includes a valve seat (6), a constant pressure assembly, and a cover plate (7). The valve seat (6) has a cavity in its center, and a main oil outlet (13) is coaxially opened at the bottom end of the valve seat (6). A circular tube (3) is coaxially fixedly connected to the inner bottom wall of the cavity. The circular tube (3) communicates with the main oil outlet (13). The cavity is divided into an annular cavity by the circular tube (3). The constant pressure assembly is mounted on the circular tube (3) and is used to control the pressure of the oil in the annular cavity. The bottom end of the valve seat (6) is also provided with an oil inlet (12) and a constant pressure oil outlet (2). The oil inlet (12) and the constant pressure oil outlet (2) are both connected to the annular cavity. A solenoid valve (1) is provided on the constant pressure oil outlet (2). The solenoid valve (1) is used to control the opening and closing of the constant pressure oil outlet (2). The solenoid valve (1) is electrically connected to the electronic control unit on the turbojet engine. The constant pressure assembly is sealed and fixed in the cavity by the cover plate (7).

2. The constant pressure fuel supply device for a turbojet engine according to claim 1, characterized in that The constant pressure component includes a mounting base (8), which is a cylinder and has an internal accommodating groove. The top end of a plunger rod (4) is slidably connected to the inner bottom wall of the mounting base (8). The plunger rod (4) has a T-shaped structure and a through hole (5) is coaxially opened on it. The plunger rod (4) is coaxially arranged with the round tube (3) and the top cap of the plunger rod (4) is sealed to the round tube (3). An elastic element is provided on the inner top wall of the mounting base (8), and the plunger rod (4) is elastically connected to the mounting base (8) through the elastic element.

3. The constant pressure fuel supply device for a turbojet engine according to claim 2, characterized in that, The elastic element is a spring (9).

4. The constant pressure fuel supply device for a turbojet engine according to claim 2, characterized in that, The valve seat (6) has a slot at its top end. A limiting ring (10) is fixedly sleeved on the outer wall of the mounting base (8). The limiting ring (10) is adapted to the slot. The limiting ring (10) is pressed and fixed in the slot by the cover plate (7).

5. The constant pressure fuel supply device for a turbojet engine according to claim 2, characterized in that, A first sealing ring (11) is fitted on the outer wall of the mounting base (8), and the mounting base (8) seals the cavity on the valve seat (6) through the first sealing ring (11).

6. The constant pressure fuel supply device for a turbojet engine according to claim 2, characterized in that, A second sealing ring (14) is provided between the top cap of the plunger rod (4) and the end face of the round tube (3).

7. The constant pressure fuel supply device for a turbojet engine according to claim 1, characterized in that, The oil inlet (12), the main oil outlet (13), and the constant pressure oil outlet (2) are all provided with internal threads.

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