Three-dimensional vector thrust testboard for micro turbojet engine
By employing a design that combines fixed and moving components with axial, lateral, and vertical thrust gauges in a three-dimensional vector thrust test rig for a micro turbojet engine, the problem of low measurement accuracy in existing technologies has been solved, achieving the effects of simplified structure and improved measurement accuracy.
Patent Information
- Application Number
- CN202423263047.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-12-30
AI Technical Summary
Existing three-dimensional vector thrust test benches for micro turbojet engines have complex structures, making it difficult to simultaneously and accurately measure thrust in the XYZ directions. They are also prone to interference and torque effects, resulting in low measurement accuracy.
The system employs a bench structure with fixed and movable components, combined with axial, lateral, and vertical thrust gauges connected by multiple support frames and universal joints to ensure independent measurement of thrust in each direction and reduce structural interference.
The simplified test bench structure improved thrust measurement accuracy, reduced manufacturing difficulty, and ensured data measurement stability and space utilization.
Smart Images
Figure CN223551333U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of engine thrust measurement technology, specifically to a three-dimensional vector thrust test bench for a micro turbojet engine. Background Technology
[0002] Currently, test benches used for thrust measurement in micro turbojet engines primarily measure axial thrust. These thrust measurement benches mainly fall into two categories: supported and suspended. Both types operate on the same principle, differing only in their structural design. The thrust measurement bench is divided into two main parts: a fixed component and a moving component. The fixed component provides support and is anchored to the ground, acting as a counterforce against the engine's thrust during measurement. The moving component is rigidly connected to the engine, supporting it and transmitting the engine's thrust to it. The force sensor is connected to both the moving and fixed components. The thrust generated by the engine is transmitted to the moving component, and the pressure or tension between the moving and fixed components represents the engine's thrust.
[0003] Test benches with vector thrust are often modified from axial thrust test benches. To measure thrust in the X, Y, and Z directions, a unidirectional thrust sensor is replaced with a tridirectional thrust sensor, allowing simultaneous measurement of thrust in all three directions. However, this modification necessitates altering the support and force transmission structure between the moving and stationary parts of the test bench. Since forces in three directions need to be measured, the other two directions must be unaffected by forces when measuring force in one direction, which poses a challenge to engine support. Support in all three directions must be considered, leading to interference between measurements in each direction. Furthermore, the measurement of forces in three dimensions generates torque, so moment must also be considered. If the measurement point and the engine are not aligned axially, an accompanying moment will occur. Utility Model Content
[0004] Purpose of the utility model: The purpose of this utility model is to improve the structure of the three-dimensional vector thrust test bench for micro jet engines, which facilitates the measurement of three-dimensional vector thrust, improves accuracy, and simplifies bench processing.
[0005] To address the aforementioned technical problems, the micro turbojet engine three-dimensional vector thrust test bench proposed in this invention adopts the following technical solution:
[0006] The three-dimensional vector thrust test bench includes a fixed frame component and a movable frame component mounted on the fixed frame component via multiple supports. The front end of the movable frame component is a closed end and is movably connected to the front support; the rear end of the movable frame component is an open end and is mounted on the rear support.
[0007] The engine under test is connected to the rear end of the moving part of the test bench via a retaining ring; the engine's air intake faces the moving part of the test bench, and the engine's central axis is located in the horizontal plane of the moving part of the test bench.
[0008] An axial thrust gauge for real-time measurement of the engine's axial thrust is provided between the front support and the front end of the moving part of the test bench.
[0009] There are two mounting spaces on the left and right sides between the rear ends of the movable parts of the test bench and the rear support. A transverse thrust gauge is installed in each of the two mounting spaces. The axial thrust and the engine axis are on the same straight line, so the measurement is accurate.
[0010] A vertical thrust gauge is provided between the rear support and the fixed retaining ring.
[0011] The engine transmits its generated force to the moving parts of the test bench via thrust gauges in three directions. These moving parts then transmit the axial force to the axial thrust gauge, yielding the axial thrust; the lateral thrust to one of the lateral thrust gauges, yielding the lateral thrust; and the vertical thrust to the vertical thrust gauge, yielding the vertical thrust. This method conveniently separates the thrust measurements in the three directions, ensuring they do not interfere with each other.
[0012] As a preferred embodiment of the three-dimensional vector thrust test bench for micro turbojet engines provided by this utility model, the movable parts of the bench are symmetrical about the central axis, and the left and right parts are symmetrical, forming a Y shape.
[0013] In a preferred embodiment of the three-dimensional vector thrust test bench for a micro turbojet engine provided by this utility model, the front end of the moving parts of the bench is connected to the front support via a universal joint; an axial thrust gauge is disposed between the front support and the universal joint. The universal joint at the front end serves as the torque point for the engine's lateral and vertical thrust. This point is located on the engine's central axis, thus preventing the formation of torques on accessories when generating lateral and vertical thrust. The universal joint allows for accurate measurement of the generated lateral and vertical torques without mutual interference.
[0014] As a preferred embodiment of the three-dimensional vector thrust test bench for micro turbojet engines provided by this utility model, a first planar bearing is arranged longitudinally on both sides of the rear end of the movable part of the bench; one end of the lateral thrust gauge is fixed on the rear support, and the other end is fixed on the first planar bearing; the longitudinally distributed first planar bearings only bear the lateral force and transmit the lateral thrust generated by the engine to the lateral thrust gauge.
[0015] In a preferred embodiment of the three-dimensional vector thrust test bench for a micro turbojet engine provided by this utility model, one end of the vertical thrust gauge is fixed to the rear support, and the other end is fixed to a second planar bearing, which is connected to the retaining ring. The second planar bearing is horizontally positioned and only bears vertical force; the vertical thrust generated by the engine is transmitted to the vertical thrust gauge through the second planar bearing.
[0016] In a preferred embodiment of the three-dimensional vector thrust test bench for a micro turbojet engine provided by this utility model, a preload spring is provided on the upper part of the retaining ring. The pressure generated by the spring presses the engine retaining ring against the vertical thrust gauge, generating a preload force on the thrust gauge. When the vertical thrust is upward, the pressure gauge reading decreases, and the decreased portion is the generated vertical thrust. The magnitude of the preload force can be adjusted by adjusting the screw.
[0017] As a preferred embodiment of the three-dimensional vector thrust test bench for micro turbojet engines provided by this utility model, two vertical thrust gauges, two preload springs, and two adjusting screws are provided, which are symmetrically arranged on both sides of the fixing ring.
[0018] Through the above technical solutions, this utility model has at least the following beneficial effects:
[0019] (1) Simplify the structure of the three-dimensional vector thrust test bench for micro turbojet engines and reduce the difficulty of processing.
[0020] (2) It helps to improve the accuracy of engine thrust measurement, reduce the impact of structure on force measurement, and ensure more stable data measurement.
[0021] (3) Reduce the support structure of the test bench, improve the utilization rate of the space around the engine installed on the test bench, and facilitate the installation of engine testing equipment. Attached Figure Description
[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0023] Figure 1 This is a side view of the three-dimensional vector thrust test rig for a micro turbojet engine.
[0024] Figure 2 This is a schematic diagram of the front structure of a three-dimensional vector thrust test rig for a micro turbojet engine.
[0025] The attached figures are labeled as follows: 1. Engine retaining ring; 2. Engine; 3. Moving part of the test bench; 4. Fixed part of the test bench; 5. Rear support; 6. Lateral thrust gauge; 7. First plane bearing; 8. Preload spring; 9. Adjusting screw; 10. Second plane bearing; 11. Vertical thrust gauge; 12. Universal joint; 13. Axial thrust gauge; 14. Front support. Detailed Implementation
[0026] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.
[0027] Figure 1 and Figure 2 The side and front structures of the thrust test stand after engine 2 is installed are shown. The retaining ring is the connector that secures engine 2 to the stand; the thrust generated by engine 2 in all directions is transmitted to the stand through the retaining ring. The air intake of engine 2 faces the moving part 3 of the stand. The central axis of engine 2 lies in the horizontal plane of the moving part 3. The universal joint 12 at the front end of the moving part serves as the torque point for the lateral and vertical thrust of engine 2. This point is on the central axis of engine 2, thus preventing the formation of torques from external components when generating lateral and vertical thrust. The universal joint 12 allows for accurate measurement of the generated lateral and vertical torques without mutual interference. Axial thrust is measured using an axial thrust gauge 13. The axial thrust is aligned with the axis of engine 2, ensuring accurate measurement. The moving part 3 of the stand, located in front of the air intake, slightly obstructs airflow into engine 2, but this obstruction is minimal, and the universal joint 12 is relatively far from the air intake, resulting in minimal impact. Engine 2 takes in air from all sides on the test bench. The intake speed is slow, so the effect of airflow obstruction is negligible.
[0028] The movable component 3 of the test bench is symmetrical about the central axis, with its left and right parts being completely symmetrical. The fixed component 4 of the test bench secures the movable component with three supports: the front support 14 and the rear support 5 (two symmetrical rear supports 5). Two lateral thrust gauges 6 are placed symmetrically to measure lateral thrust. Since the planar bearing cannot withstand tensile force, the thrust gauge in the direction of the lateral thrust is used for measurement. One end of the lateral thrust gauge 6 is fixed to the rear support 5, and the other end is fixed to the first planar bearing 7. The first planar bearing 7 only bears lateral force, transmitting the lateral thrust generated by the engine 2 to the thrust gauge. The first planar bearing 7 is placed on the longitudinal plane, so that the axial and vertical forces of the movable component 3 of the test bench cannot be transmitted to the thrust gauge, ensuring that the thrust gauge only measures lateral thrust.
[0029] One end of the vertical thrust gauge 11 is fixed to the rear support, and the other end is fixed to a second planar bearing 10. The planar bearing is connected to the retaining ring of the engine 2. The vertical thrust generated by the engine 2 is transmitted to the vertical thrust gauge 11 through the second planar bearing 10. The second planar bearing 10 is placed on a horizontal surface and cannot withstand axial or lateral thrust, thus allowing for accurate measurement of vertical thrust. Regarding vertical force, since the planar bearing can only withstand pressure, not tension, a preload spring 8 is added. The pressure generated by the spring presses against the retaining ring 1 of the engine 2, pressing the retaining ring against the vertical thrust gauge 11, generating a preload force on the thrust gauge. When the vertical thrust increases, the pressure gauge reading decreases; the decrease is the generated vertical thrust. The magnitude of the preload force can be adjusted using the adjusting screw 9.
[0030] Through thrust gauges in three directions, the engine 2 transmits the generated force to the test bench moving part 3. The test bench moving part 3 transmits the axial force to the axial thrust gauge 13, obtaining axial thrust; the test bench moving part 3 transmits the lateral thrust to one of the lateral thrust gauges 6, obtaining lateral thrust; and the test bench moving part 3 transmits the vertical thrust to the two vertical thrust gauges 11, obtaining vertical thrust. In this way, the thrust measurements in the three directions are conveniently separated and do not interfere with each other.
[0031] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the present utility model to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.
Claims
1. A three-dimensional vector thrust test bench for a micro turbojet engine, characterized in that, include: A fixed platform component, and a movable platform component mounted on the fixed platform component via multiple supports; The front end of the movable part of the platform is a closed end and is movably connected to the front support; the rear end of the movable part of the platform is an open end and is mounted on the rear support. The engine under test is connected to the rear end of the moving part of the test bench via a retaining ring; the engine's air intake faces the moving part of the test bench, and the engine's central axis is located in the horizontal plane of the moving part of the test bench. An axial thrust gauge for real-time measurement of engine axial thrust is provided between the front support and the front end of the movable part of the test bench. There are two mounting spaces on the left and right sides between the rear ends of the movable part of the platform and the rear support, and a transverse thrust gauge is installed in each of the two mounting spaces. A vertical thrust gauge is provided between the rear support and the fixing ring.
2. The three-dimensional vector thrust test rig for a micro turbojet engine according to claim 1, characterized in that, The movable parts of the platform are symmetrical about the central axis, with the left and right parts being symmetrical and forming a Y shape.
3. The three-dimensional vector thrust test rig for a micro turbojet engine according to claim 2, characterized in that, The front end of the movable part of the platform is connected to the front support via a universal joint; The axial thrust gauge is disposed between the front support and the universal joint.
4. The three-dimensional vector thrust test rig for a micro turbojet engine according to claim 1, characterized in that, The rear sides of the movable part of the platform are each provided with a first planar bearing in a longitudinal direction; one end of the transverse thrust gauge is fixed to the rear support, and the other end is fixed to the first planar bearing. The longitudinally distributed first planar bearing only bears the lateral force, transmitting the lateral thrust generated by the engine to the lateral thrust gauge.
5. The three-dimensional vector thrust test rig for a micro turbojet engine according to claim 1, characterized in that, One end of the vertical thrust gauge is fixed to the rear support, and the other end is fixed to a second planar bearing, which is connected to the retaining ring. The second planar bearing is placed horizontally and only bears vertical force. The vertical thrust generated by the engine is transmitted to the vertical thrust gauge through the second planar bearing.
6. The three-dimensional vector thrust test rig for a micro turbojet engine according to claim 5, characterized in that, A preload spring is provided on the upper part of the retaining ring, and a preload force is applied to the retaining ring by the preload spring; The preload of the preload spring is adjusted by the adjusting screw on its upper part.
7. The three-dimensional vector thrust test rig for a micro turbojet engine according to claim 5 or 6, characterized in that, Two of each of the vertical thrust gauge, preload spring, and adjusting screw are provided, and they are symmetrically arranged on both sides of the fixing ring.