A variable cycle aeroengine mode selection mechanism ground verification test device

Abstract

The application belongs to the technical field of gas turbine, and particularly relates to a ground verification test device for a variable cycle aero-engine mode selection mechanism, comprising: a test piece adapter cylinder for fixedly mounting a test piece; a squirrel cage type bearing base circumferentially mounted with a plurality of bearing base actuators; a bearing base actuator having one end fixed to a test base platform and the other end connected to the squirrel cage type bearing base and driving the axial displacement of the squirrel cage type bearing base; wherein the test piece has a plurality of circumferentially distributed valve pieces driven by test piece actuators, the valve piece actuators apply a load always perpendicular to the valve pieces to the valve pieces; the valve piece actuators are hinged between two adjacent support rods; the valve piece actuators swing up and down with the axial movement of the squirrel cage type bearing base, and the test scheme for ground verification of the adjustment mechanism is adjusted in a concentrated force instead of a valve piece aerodynamic uniform force mode, the ground verification test scheme is replaced by a pneumatic loading mode, no gas source loading equipment is needed, and the test cost and period are maximally reduced.

Description

Technical Field

[0001] This application belongs to the field of gas turbine technology, and specifically relates to a ground verification test device for a variable cycle aero-engine mode selection mechanism. Background Technology

[0002] Variable cycle engines have two typical operating modes: "single-bypass" mode and "double-bypass" mode, which can be switched freely between via a mode selection mechanism. A certain type of engine employs a flip-plate type active mode switching mechanism. Its adjustment mechanism is based on a crank-slider structure, using an actuator to drive the valve plate opening and closing. When the valve plate is closed, it operates in "single-bypass" mode; when the valve plate is open, it operates in "double-bypass" mode. The outer surface of the valve plate is subjected to the pressure of the bypass airflow. During the valve plate opening and closing process, the magnitude and direction of this pressure change, and the resultant force of the pressure is always perpendicular to the surface of the valve plate. The magnitude and direction of the load on the valve plate during the opening and closing process of a certain type of aero-engine show that both the magnitude and direction of the load change during the valve plate opening and closing process. Test verification on the engine bench is time-consuming and costly; if the test component malfunctions, the losses are significant. Ground verification is necessary before test bench verification to assess its strength, lifespan, and functionality. Ground verification using pneumatic loading requires high-pressure, high-flow-rate air source equipment, which is extremely costly and difficult to implement.

[0003] A static load treatment method is adopted: a concentrated force is applied to the valve plate using an actuator to replace the pneumatic uniform force on the valve plate. Ground verification of the regulating mechanism other than the valve plate is conducted to assess its strength, lifespan, and functionality. Then, a strength test with a uniform load is performed on the valve plate separately to assess its strength and lifespan. In this way, all components of the regulating mechanism can be effectively verified. Using a concentrated force applied to the valve plate using an actuator to replace the pneumatic uniform force requires that the load direction rotates with the valve plate during opening and closing and remains perpendicular to the plane of the valve plate's loading area. Traditional static load units can only apply loads in a fixed direction and cannot apply loads in a variable direction.

[0004] The entire variable cycle engine mode selection mechanism has eight valves. The space between the valves is narrow, making the installation and debugging of the eight valve actuators difficult. To meet the requirements of variable direction and variable load valves, the support base of the eight valve actuators must be synchronized with the actuator of the active mode switching mechanism. Due to the limited space, the stroke of the valve actuators is limited and can only be adjusted within the working range. If the support base exceeds the normal working range during debugging, exceeding the automatic adjustment stroke of the valve actuators, the support base will drag the valve actuators and apply abnormal loads to the valves, which may damage the valve test pieces. There may be machining deviations in the angular position between the eight valves and the valve actuators, which will prevent the valves from being installed properly. At the same time, the angular machining deviations between the two will cause the loads between them to be off-axis, resulting in abnormal valve loads.

[0005] Disadvantages of existing technology:

[0006] 1. Using a valve plate actuator to apply concentrated force to the valve plate instead of the pneumatic uniform force of the valve plate for ground verification of the adjustment mechanism, replacing the pneumatic loading method for ground verification, eliminating the need for air source equipment, and minimizing test costs;

[0007] 2. It overcomes the limitation of traditional static loading units that can only apply loads in a fixed direction, and meets the requirement of varying direction and magnitude of the valve plate load applied during valve opening and closing.

[0008] 3. Design a load-bearing foundation and protection device that moves synchronously with the actuator of the active mode switching mechanism in a confined space, solve the problem of difficult installation and debugging of valve plate actuator, and protect the safety of test pieces;

[0009] 4. Design a multi-degree-of-freedom mounting base for the valve plate actuator to meet the requirements of axial and circumferential multi-degree-of-freedom rotation of the valve plate actuator, and solve the problems of difficult installation between the valve plate and the valve plate actuator and load interference. Summary of the Invention

[0010] To address the aforementioned problems, this application provides a ground verification test apparatus for a variable cycle aero-engine mode selection mechanism, comprising:

[0011] Test specimen adapter sleeve for fixing and mounting test specimens;

[0012] A squirrel-cage bearing foundation with multiple bearing foundation actuators installed circumferentially;

[0013] A bearing foundation actuator cylinder, with one end fixed to the test foundation platform and the other end connected to the squirrel cage bearing foundation, drives the axial displacement of the squirrel cage bearing foundation.

[0014] The test piece has multiple circumferentially distributed valve plates driven by the test piece actuator cylinder, and the valve plate actuator cylinder applies a load to the valve plate that is always perpendicular to the valve plate.

[0015] The squirrel cage bearing foundation includes: an upper support plate, a lower support plate, and support rods distributed circumferentially and connected between the upper and lower support plates. The valve plate actuating cylinder is hinged between two adjacent support rods; the valve plate actuating cylinder swings up and down as the squirrel cage bearing foundation moves axially.

[0016] Preferably, the valve plate actuating cylinder is mounted between two adjacent support rods via a multi-degree-of-freedom mounting base. The upper and lower sides of the multi-degree-of-freedom mounting base are hinged between the upper and lower support plates via a second pin. The multi-degree-of-freedom mounting base has a degree of freedom to rotate around the axis of the second pin. The valve plate actuating cylinder is hinged in the central hole of the multi-degree-of-freedom mounting base via a first pin. The valve plate actuating cylinder has a degree of freedom to rotate along the axis of the first pin.

[0017] Preferably, the lower end face of the lower support plate has a guide tube, which is sleeved inside the bearing, and the bearing is fixed to the inner wall of the test piece adapter tube by a mounting seat.

[0018] Preferably, the bearing has a load-bearing base displacement sensor on its outer side for measuring the axial displacement of the lower support plate.

[0019] Preferably, the upper end of the upper support plate has an upper limit block fixed to the upper end of the crossbeam to restrict the axial upward displacement of the upper support plate.

[0020] Preferably, the test piece actuator cylinder has an actuator cylinder displacement sensor, and the extension and retraction of the bearing base actuator cylinder and the valve plate actuator cylinder are controlled by the electrical signals of the actuator cylinder displacement sensor and the bearing base displacement sensor.

[0021] Preferably, a lower limit block is installed on the bearing mounting base to restrict the axial downward displacement freedom of the lower support plate.

[0022] The advantages of this application include:

[0023] 1. A test scheme for ground verification of the regulating mechanism using concentrated force instead of pneumatic uniform force distribution on valve plates, replacing the pneumatic loading method, eliminates the need for air source loading equipment, thus minimizing test costs and time.

[0024] 2. The designed multi-degree-of-freedom dynamic loading scheme overcomes the limitation of traditional static loading units that can only apply loads in a fixed direction, and realizes the loading capability of varying load direction and magnitude.

[0025] 3. The cage-type load-bearing foundation structure adopted in this invention realizes the installation of 8 actuators in an effective space using a few simple support rods and plates. Its structure is simple and easy to install, and the absence of complex structures reduces the processing cost of experimental tooling.

[0026] 4. The multi-degree-of-freedom mounting base structure adopted in this invention realizes the function of multi-degree-of-freedom rotation of the actuator in space using a ring and a pin. Its structure is simple and compact, and easy to install. It realizes the installation of the actuator without complex structure, thus reducing the processing cost of experimental tooling. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the test apparatus of a preferred embodiment of this application in the valve-open state;

[0028] Figure 2 This is a schematic diagram of the test apparatus of a preferred embodiment of this application in the valve closed state;

[0029] Figure 3 This is a front view of a preferred embodiment of the cage-type load-bearing foundation of this application;

[0030] Figure 4 This is a top view of a preferred embodiment of the cage-type bearing foundation of this application;

[0031] Figure 5 This is a schematic diagram of a preferred embodiment of the multi-degree-of-freedom mounting base of this application;

[0032] Figure 6 This is a schematic diagram of a preferred embodiment of the present application, including a cage-type load-bearing foundation, a multi-degree-of-freedom mounting seat, and a valve plate actuator.

[0033] Figure 7 This is a schematic diagram of the active mode switching mechanism of a certain type of aircraft engine. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0035] Test apparatus such as Figure 1-2 As shown, test specimen 11 is fixed to the test base platform 1 via test specimen adapter 3. The bearing frame 2 is also fixed to the test base platform 1, and the upper limit block 15 is fixed to the bearing frame 2 to limit the axial displacement of the squirrel-cage bearing base 8, preventing the control system of the squirrel-cage bearing base 8 from malfunctioning during valve closure, which could cause the squirrel-cage bearing base 8 to continuously move upwards and damage the valve plate of the test specimen. The squirrel-cage bearing base 8 is installed inside the bearing 5 and can move freely up and down. The squirrel-cage bearing base 8 includes: an upper support plate 81, a lower support plate 82, and support rods 83 circumferentially distributed and connected between the upper support plate 81 and the lower support plate 82. The valve plate actuating cylinder 12 is hinged between two adjacent support rods 83; the valve plate actuating cylinder 12 swings up and down with the axial movement of the squirrel-cage bearing base 8.

[0036] The valve plate actuating cylinder 12 is mounted between two adjacent support rods 83 via a multi-degree-of-freedom mounting base 84. The upper and lower sides of the multi-degree-of-freedom mounting base 84 are hinged between the upper support plate 81 and the lower support plate 82 via a second pin 85. The multi-degree-of-freedom mounting base 84 has a degree of freedom to rotate around the axis of the second pin 85. The valve plate actuating cylinder 12 is hinged in the central hole of the multi-degree-of-freedom mounting base 84 via a first pin 86. The valve plate actuating cylinder 12 has a degree of freedom to rotate along the axis of the first pin 86.

[0037] The squirrel-cage bearing base 8 is driven by the bearing base actuator 4, and the displacement is fed back by the bearing base displacement sensor 6. Eight valve actuators 12 are fixed to the squirrel-cage bearing base 8 via degree-of-freedom mounting seats, ensuring that the valve actuators 12 can move up and down and rotate accordingly when the squirrel-cage bearing base 8 moves up and down. The other side of each valve actuator 12 is connected to the valve plate 9 of the test piece 11 via a force gauge 10, applying a load to the valve plate. By synchronously controlling the displacement of the squirrel-cage bearing base 8, the valve actuator 12 is ensured to be perpendicular to the surface of the valve plate 9 of the test piece, achieving that the loading direction rotates with the valve plate and is always perpendicular to the plane of the valve plate loading area. The valve plate 9 is synchronously opened or closed by the linkage ring controlled by the eight test piece actuators 13 and actuator displacement sensors 14. The actuator displacement sensors 14 are installed between the linkage ring and the mounting edge of the packaging casing, with four displacement sensors evenly distributed. One displacement sensor controls the operation, and the other three are used to monitor the displacement synchronicity of different parts of the linkage ring to prevent asynchronous loading. Eight test specimen actuator cylinders 13 are connected in parallel and controlled by one displacement sensor. Eight valve plate actuator cylinders 12 are connected in parallel and controlled by one force gauge, with the other seven force gauges monitoring load consistency. A lower limit block 7 is fixed to the test specimen transition cylinder 3 to prevent the squirrel-cage bearing foundation 8 from running out of control and damaging the test specimen when the valve plate is in the open state. The load is applied by the structural static test loading unit composed of the transition section, actuator cylinders, sensor, and bearing foundation.

[0038] The squirrel cage bearing foundation 8 includes: an upper support plate 81, a lower support plate 82, and support rods 83 distributed circumferentially and connected between the upper support plate 81 and the lower support plate 82. The valve plate actuating cylinder 12 is hinged between two adjacent support rods 83. The valve plate actuating cylinder 12 swings up and down as the squirrel cage bearing foundation 8 moves axially.

[0039] The valve plate actuating cylinder 12 is mounted between two adjacent support rods 83 via a multi-degree-of-freedom mounting base 84. The upper and lower sides of the multi-degree-of-freedom mounting base 84 are hinged between the upper support plate 81 and the lower support plate 82 via a second pin 85. The multi-degree-of-freedom mounting base 84 has a degree of freedom to rotate around the axis of the second pin 85. The valve plate actuating cylinder 12 is hinged in the central hole of the multi-degree-of-freedom mounting base 84 via a first pin 86. The valve plate actuating cylinder 12 has a degree of freedom to rotate along the axis of the first pin 86.

[0040] like Figure 3 As shown, a multi-degree-of-freedom servo loading mechanism is designed, using a valve plate actuator to apply a concentrated force to the valve plate instead of the uniformly distributed pneumatic force on the valve plate. This is achieved through... Figure 4 The cage-type load-bearing foundation and the actuator of the active mode switching mechanism are synchronized to ensure that the direction of the load applied by the valve actuator during valve opening and closing is perpendicular to the plane of the valve loading part as the valve rotates, thus achieving variable direction and variable load application. This meets the strength, life, and functional test requirements of the mode selection mechanism under load conditions.

[0041] like Figures 3-4 As shown, a cage-type valve actuator bearing foundation is constructed using upper and lower support plates and 8 sets of support rods (16 in total). The structure is simple, the frame structure has strong load-bearing capacity, and the modular design facilitates installation. The valve actuator is installed within the cage-type bearing foundation, connected to the valve plate, and a concentrated force is applied. During the test, the bearing foundation actuator... Figure 3 The displacement sensor 6 controls the squirrel-cage bearing foundation to move up and down within the bearing, in conjunction with... Figure 3 The test specimen's actuator 13 is linked, changing the angle between the valve actuator and the squirrel-cage bearing foundation, ensuring the valve actuator remains perpendicular to the valve surface, thus achieving the application of variable-direction loads. For example... Figure 1 The diagram shows the positional relationship between the valve plate, valve plate actuator, and squirrel cage bearing foundation when the valve plate is fully open; as shown... Figure 2 The diagram shows the positional relationship between the valve plate, valve plate actuator, and squirrel cage bearing foundation when the valve plate is fully closed.

[0042] Figures 5-6 A multi-degree-of-freedom valve actuator mounting base is designed to meet the requirements of axial and circumferential multi-degree-of-freedom rotation of the valve actuator. The valve actuator is connected to the multi-degree-of-freedom mounting base via pin #1, allowing it to rotate up and down around the pin within the mounting base. The multi-degree-of-freedom mounting base with the valve actuator installed is then mounted between the upper and lower support plates of the squirrel-cage bearing foundation via pin #2. One set of assembled multi-degree-of-freedom mounting bases with the valve actuator is installed between every two sets of support rods, with eight sets evenly distributed circumferentially. The multi-degree-of-freedom mounting bases drive the valve actuator to rotate left and right between the two sets of support rods. Thus, through the two sets of pins installed within the multi-degree-of-freedom mounting bases, the valve actuator can rotate up, down, left, and right between the support rods of the squirrel-cage bearing foundation, achieving multi-degree-of-freedom rotation within the valve actuator's space. The structure is simple, easier to install, and simultaneously meets the loading requirements of changing loading direction during the valve opening and closing process of the test piece, avoiding load interference.

[0043] When the squirrel-cage bearing foundation is working normally, it moves up and down with the opening and closing of the valve plate. If the control of the squirrel-cage bearing foundation is abnormal, exceeding the normal movement range may cause the valve plate of the mode switching mechanism to be damaged due to abnormal loads exceeding the self-adjustment capacity of the valve plate actuator when it is in an abnormal position. Therefore, a mechanical limit structure is designed (…). Figure 1-2 The upper and lower limit blocks (7 and 15) are installed on the bearing base and have a threaded structure that allows for free height adjustment. The squirrel cage bearing base can only move between the limit blocks, ensuring the safety of the test specimen.

[0044] The above description is merely a specific embodiment 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 technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A variable cycle aeroengine mode selection mechanism ground verification test apparatus, characterized by, include: Test specimen adapter tube (3) for fixing and installing test specimen (11); A squirrel cage bearing foundation (8) with multiple valve plate actuators (12) installed circumferentially; A bearing foundation actuator (4) with one end fixed to the test foundation platform (1) and the other end connected to the squirrel cage bearing foundation (8) and driving the axial displacement of the squirrel cage bearing foundation (8); Among them, the test piece (11) has multiple circumferentially distributed valve plates (9) driven by the test piece actuator (13), and the valve plate actuator (12) applies a load to the valve plate (9) that is always perpendicular to the valve plate (9); The cage-type bearing foundation (8) includes: an upper support plate (81), a lower support plate (82), and support rods (83) distributed circumferentially and connected between the upper support plate (81) and the lower support plate (82). The valve plate actuating cylinder (12) is hinged between two adjacent support rods (83). The valve plate actuating cylinder (12) swings up and down as the cage-type bearing foundation (8) moves axially.

2. The variable cycle aeroengine mode selection mechanism ground verification test apparatus of claim 1, wherein, The valve plate actuator (12) is mounted between two adjacent support rods (83) via a multi-degree-of-freedom mounting base (84). The upper and lower sides of the multi-degree-of-freedom mounting base (84) are hinged between the upper support plate (81) and the lower support plate (82) via a second pin (85). The multi-degree-of-freedom mounting base (84) has a degree of freedom to rotate around the axis of the second pin (85). The valve plate actuator (12) is hinged in the central hole of the multi-degree-of-freedom mounting base (84) via a first pin (86). The valve plate actuator (12) has a degree of freedom to rotate along the axis of the first pin (86).

3. The ground verification test device for the variable cycle aero-engine mode selection mechanism as described in claim 1, characterized in that, The lower end face of the lower support plate (82) has a guide tube, which is sleeved inside the bearing (5). The bearing (5) is fixed to the inner wall of the test piece adapter tube (3) by the mounting seat.

4. The ground verification test device for the variable cycle aero-engine mode selection mechanism as described in claim 3, characterized in that, The bearing (5) has a bearing base displacement sensor (6) on the outside to measure the axial displacement of the lower support plate (82).

5. The ground verification test device for the variable cycle aero-engine mode selection mechanism as described in claim 3, characterized in that, The upper end of the upper support plate (81) has an upper limit block (15) fixed to the upper end of the crossbeam, which restricts the axial upward displacement of the upper support plate (81).

6. The ground verification test apparatus for the variable cycle aero-engine mode selection mechanism as described in claim 4, characterized in that, The test piece actuator cylinder (13) has an actuator cylinder displacement sensor (14), and the extension and retraction of the bearing base actuator cylinder (4) and the valve plate actuator cylinder (12) are controlled by the electrical signals of the actuator cylinder displacement sensor (14) and the bearing base displacement sensor (6).

7. The ground verification test apparatus for the variable cycle aero-engine mode selection mechanism as described in claim 4, characterized in that, A lower limit block (7) is installed on the mounting base of the bearing (5) to restrict the axial downward displacement degree of freedom of the lower support plate (82).

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