Radial gas foil bearing test bed

Abstract

The utility model provides a radial gas foil bearing test bench, comprising a base plate used for providing support; the test rotating shaft is rotatably mounted on the bottom plate and extends along the horizontal direction; the driving motor is in driving connection with the testing rotating shaft through a coupler, and the free end of the testing rotating shaft is used for penetrating through an inner hole of the radial air foil bearing to be tested; the positioning mechanism is arranged on one side of the free end of the test rotating shaft and used for axially fixing the radial gas foil bearing to be tested, and the positioning mechanism comprises a limiting piece used for limiting circumferential rotation of the radial gas foil bearing to be tested; the loading mechanism is arranged above the positioning mechanism and is fixed on the bottom plate, and the loading mechanism is provided with a force application end and is used for applying an adjusting load in the vertical direction to the radial gas foil bearing to be tested; the rotating speed measuring device is used for measuring the rotating speed of the test rotating shaft. The test bench has the advantage of being capable of comprehensively and accurately testing a plurality of key technical indexes such as the bearing capacity and the take-off rotating speed of the radial gas foil bearing.

Description

TECHNICAL FIELD

[0001] The utility model relates to bearing test equipment field, specifically, relate to a radial gas foil bearing test bench. BACKGROUND

[0002] Radial foil bearing is a sliding bearing that uses elastic foil to suspend the shaft by fluid pressure or static pressure, and its carrying capacity is an important technical index for evaluating radial foil bearing. The carrying capacity directly affects the performance and service life of the bearing, so accurate measurement and evaluation of the carrying capacity of the radial foil bearing are of great significance to the design and application of the bearing.

[0003] Currently, the main way to obtain the carrying capacity of the radial foil bearing is through theoretical calculation and data simulation. Although these methods can provide certain reference value, they often cannot completely simulate the complex behavior of the bearing under actual working conditions. Theoretical calculation may ignore some actual factors, and the precision of data simulation is limited by the accuracy of the model and the computing power.

[0004] Experimental demonstration is relatively lacking in the performance evaluation of radial foil bearings, mainly due to the lack of a device that can comprehensively test the carrying capacity, takeoff speed and other technical indicators of radial foil bearings. The lack of effective experimental testing methods leads to great uncertainty in the design and optimization process of radial foil bearings. Engineers have difficulty obtaining reliable experimental data to verify and improve theoretical models, and cannot accurately assess the actual performance differences of different design schemes. This not only affects the performance improvement of radial foil bearings, but also increases the time and cost of product development. SUMMARY

[0005] The purpose of the present application is to provide a radial gas foil bearing test bench, which has the advantages of being able to comprehensively and accurately test multiple key technical indicators such as the carrying capacity and takeoff speed of radial gas foil bearings.

[0006] The present application provides a radial gas foil bearing test bench, comprising: a base plate for providing support; a test shaft rotatably mounted on the base plate and extending in the horizontal direction; a drive motor drivingly connected to the test shaft through a shaft coupling, the free end of the test shaft being used to pass through the inner hole of the radial gas foil bearing to be tested; a positioning mechanism arranged on one side of the free end of the test shaft for axially fixing the radial gas foil bearing to be tested, the positioning mechanism comprising a limiting piece for limiting the circumferential rotation of the radial gas foil bearing to be tested; a loading mechanism arranged above the positioning mechanism and fixed to the base plate, the loading mechanism having a force applying end for applying an adjustable load in the vertical direction to the radial gas foil bearing to be tested; a rotational speed measuring device for measuring the rotational speed of the test shaft.

[0007] Compared with the prior art, the radial air foil bearing test bench has the following advantages: the test bench realizes accurate testing of key technical indexes such as bearing capacity and take-off rotating speed of the radial air foil bearing by integrating functions such as driving, loading, positioning and measuring; in particular, the positioning mechanism designed in the application can not only axially fix the bearing to be tested, but also limit the circumferential rotation of the bearing to be tested, thereby ensuring the accuracy of the test; meanwhile, the design of the loading mechanism allows accurate control and adjustment of the radial load applied to the bearing during the test, which provides the possibility for studying the bearing performance under different load conditions. Thus, reliable experimental data are provided for the research and development of the radial air foil bearing.

[0008] In a possible implementation, the loading mechanism comprises a fixed support, a differential head, an elastic member and a force sensor, the fixed support is mounted on the bottom plate, the main body of the differential head is fixedly connected to the fixed support, the telescopic rod of the differential head is arranged to extend in the vertical direction, the elastic member is connected between the telescopic rod of the differential head and the radial air foil bearing to be tested, and the force sensor is arranged between the telescopic rod and the elastic member and is used to detect the elastic force of the elastic member. Compared with the prior art, the combination of the differential head, the elastic member and the force sensor realizes accurate control and real-time measurement of the load, which not only improves the accuracy and repeatability of the test, but also enables more complex dynamic tests to be performed.

[0009] In a possible implementation, the outer peripheral wall of the radial air foil bearing to be tested is provided with a connecting structure, and the elastic member is connected to the radial air foil bearing to be tested through the connecting structure. Compared with the prior art, the radial air foil bearing to be tested can be more conveniently connected to the loading mechanism, thereby improving the operation convenience and test efficiency of the test bench.

[0010] In a possible implementation, the elastic member is a spiral tension spring, and the connecting structure is a matching hook. Compared with the prior art, the design of the spiral tension spring and the matching hook not only improves the stability of the connection, but also enables the radial air foil bearing to be tested to be better disassembled and assembled, thereby improving the versatility and practicality of the test bench.

[0011] In a possible implementation, the positioning mechanism comprises a base and a limiting rod, the base is fixedly connected to the bottom plate, and the limiting rod is fixedly connected to the base and extends upward. Compared with the prior art, the base is fixedly mounted on the bottom plate, and the limiting rod extending upward is arranged on the base, so that the position and movement of the radial air foil bearing to be tested can be effectively limited.

[0012] In a possible implementation, the outer peripheral wall of the radial air foil bearing to be tested is provided with a limiting structure matched with the limiting rod, for limiting the circumferential rotation of the radial air foil bearing to be tested. Compared with the prior art, the radial air foil bearing to be tested will not rotate circumferentially even under high speed rotation and load, thus ensuring the accuracy and reliability of the test.

[0013] In a possible implementation, the limiting structure is a socket matched with the top end of the limiting rod. Compared with the prior art, the matching of the limiting rod and the socket not only limits the circumferential rotation of the radial air foil bearing to be tested, but also prevents the axial movement of the bearing to a certain extent; this design makes the position of the bearing more stable during the test, and helps to improve the accuracy of the test data.

[0014] In a possible implementation, the top end of the limiting rod is conical. Compared with the prior art, by setting the top end of the limiting rod to be conical, the matching precision of the limiting rod and the socket on the radial air foil bearing to be tested can be improved.

[0015] In a possible implementation, the bottom of the base plate is provided with a damping pad. Compared with the prior art, the influence of external vibration on the test bench can be effectively reduced, and the accuracy and reliability of the test results can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 is a schematic view of the three-dimensional structure of the present application;

[0017] Fig. 2 is a sectional view of the present application;

[0018] Fig. 3 is a schematic view of the structure of the radial air foil bearing to be tested;

[0019] REFERENCE SIGNS:

[0020] 1, base plate; 11, damping pad; 2, test rotating shaft; 3, driving motor; 4, positioning mechanism; 41, base; 42, limiting rod; 5, loading mechanism; 51, fixed support; 52, differential head; 521, telescopic rod; 53, elastic member; 54, force sensor; 10, radial air foil bearing to be tested; 101, draw hook; 102, socket. DETAILED DESCRIPTION

[0021] First of all, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can adjust them as needed in order to adapt to specific application occasions.

[0022] In the description of the embodiments of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0023] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or it only means that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or it only means that the horizontal height of the first feature is less than that of the second feature.

[0024] Radial foil bearing is a kind of sliding bearing that uses elastic foil and fluid pressure to achieve shaft suspension, and its carrying capacity is a key indicator to evaluate its performance. However, current research on the carrying capacity of radial foil bearings mainly relies on theoretical calculation and data simulation, lacking experimental verification. This situation leads to difficulties in accurately assessing the actual performance of radial foil bearings, especially in key technical indicators such as carrying capacity and take-off speed. The lack of comprehensive experimental test devices makes it difficult for engineers to obtain reliable measured data, thereby affecting the design optimization and performance improvement of radial foil bearings.

[0025] Specifically, in the field of high-speed rotating machinery, such as aerospace engines and other applications, the performance of radial foil bearings directly affects the operating efficiency and reliability of the entire system. For example, during the design process of an aerospace engine, engineers need to accurately understand the take-off speed of radial foil bearings under different load conditions. However, due to the lack of experimental test platforms, engineers can only rely on theoretical models for estimation. This estimation may deviate from the actual situation, leading to problems such as insufficient bearing performance or overdesign in actual applications. In addition, under different working conditions such as temperature changes or load fluctuations, the actual performance of radial foil bearings may differ from theoretical predictions. Due to the inability to conduct comprehensive experimental verification, these potential performance differences are difficult to accurately capture and quantify.

[0026] If this technical problem cannot be solved, it will have a serious impact on the design and optimization of high-speed rotating machinery. First, the uncertainty of bearing performance may lead to a decrease in the reliability of the entire system, increasing the risk of failure. Second, due to the lack of accurate experimental data, engineers may adopt a conservative design strategy, leading to overdesign of bearings, increasing the weight and cost of the system. In addition, the inability to accurately measure the performance of radial foil bearings under different working conditions will hinder further innovation and breakthroughs in bearing technology. This not only limits the performance improvement of high-speed rotating machinery, but also may affect the technical competitiveness of related industries. Therefore, it is particularly important to develop an experimental device that can comprehensively test the performance of radial foil bearings, which will provide reliable experimental basis for bearing design and promote the development of related technologies.

[0027] The application will be further described in detail below in conjunction with the drawings and specific embodiments.

[0028] Referring to Figs. 1 to 3 The embodiment of the application discloses a radial gas foil bearing test bench, which comprises a bottom plate 1, a test rotating shaft 2, a driving motor 3, a positioning mechanism 4, a loading mechanism 5 and a rotating speed measuring device. The bottom plate 1 is used for providing support. The test rotating shaft 2 is rotatably installed on the bottom plate 1 and extends in the horizontal direction. The driving motor 3 is drivingly connected with the test rotating shaft 2 through a shaft coupling. The free end of the test rotating shaft 2 is used for penetrating the inner hole of the radial gas foil bearing 10 to be tested. The positioning mechanism 4 is arranged on one side of the free end of the test rotating shaft 2 and is used for axially fixing the radial gas foil bearing 10 to be tested. The positioning mechanism 4 comprises a limiting piece used for limiting the circumferential rotation of the radial gas foil bearing 10 to be tested. The loading mechanism 5 is arranged above the positioning mechanism 4 and is fixed on the bottom plate 1. The loading mechanism 5 has a force applying end and is used for applying an adjusting load in the vertical direction to the radial gas foil bearing 10 to be tested. The rotating speed measuring device is used for measuring the rotating speed of the test rotating shaft 2.

[0029] The bottom plate 1 is used as the foundation of the whole test bench to provide stable support, and can be made of metal plate or composite material. The test shaft 2 is rotatably installed on the bottom plate 1 and extends in the horizontal direction, and the free end thereof is used to pass through the inner hole of the radial air foil bearing 10 to be tested, and can be a metal shaft processed with high precision. The driving motor 3 is drivingly connected to the test shaft 2 through a coupling, and is used to control the rotating speed of the shaft, and can be a variable frequency motor; the selection of the coupling considers the dynamic balance requirement in high-speed operation to reduce vibration. In order to accurately position the bearing to be tested, the positioning mechanism 4 is designed. The positioning mechanism 4 is arranged on the side of the free end of the test shaft 2, and is used to axially fix the radial air foil bearing 10 to be tested. In order to prevent the bearing from rotating circumferentially during the test, the positioning mechanism 4 further comprises a limiting piece for limiting the circumferential rotation of the radial air foil bearing 10 to be tested. The loading mechanism 5 is a key part of the test bench, and is used to simulate different load conditions. The loading mechanism 5 is arranged above the positioning mechanism 4 and is fixed to the bottom plate 1. The loading mechanism 5 has a force applying end for applying an adjusting load in the vertical direction to the radial air foil bearing 10 to be tested. This design allows accurate control and adjustment of the radial load applied to the bearing during the test. In order to accurately measure the performance parameters of the bearing, a rotating speed measuring device is also designed. This device is used to measure the rotating speed of the test shaft 2 to determine the take-off rotating speed of the radial air foil bearing under different loads. The take-off rotating speed is an important indicator for evaluating the performance of the bearing, and accurate experimental data can be obtained in this way. Specifically, an optical or magneto-optical rotating speed sensor can be used.

[0030] As can be known from the above, in the actual test process, first, the radial air foil bearing 10 to be tested is installed on the test shaft 2 and fixed through the positioning mechanism 4. Then, a predetermined load is applied through the loading mechanism 5. The driving motor 3 is started, and the rotating speed is gradually increased, while the rotating speed measuring device monitors the rotating speed change in real time. When the bearing reaches the take-off state, the rotating speed at this time is recorded as the take-off rotating speed. By changing the load of the loading mechanism 5, the above process is repeated to obtain the take-off rotating speed data under different loads, so as to comprehensively evaluate the performance of the radial air foil bearing. The whole system is operated in coordination through the control system, and the control system is electrically connected with the driving motor 3, the loading mechanism 5 and the rotating speed measuring device to realize data acquisition and analysis.

[0031] In the present embodiment, the loading mechanism 5 comprises a fixed support 51, a differential head 52, an elastic member 53, and a force sensor 54. The fixed support 51 is mounted on the base plate 1. The main body of the differential head 52 is fixedly connected to the fixed support 51. The telescopic rod 521 of the differential head 52 is vertically adjustable and protrudes. The elastic member 53 is connected between the telescopic rod 521 of the differential head 52 and the radial air foil bearing 10 to be tested. The force sensor 54 is arranged between the telescopic rod 521 and the elastic member 53 and is used to detect the elastic force of the elastic member 53. Specifically, the fixed support 51 is mounted on the base plate 1 to provide stable support for the entire loading mechanism 5. The main body of the differential head 52 is fixedly connected to the fixed support 51. The telescopic rod 521 of the differential head 52 is vertically adjustable and protrudes to accurately control the application of load. The elastic member 53 is connected between the telescopic rod 521 of the differential head 52 and the radial air foil bearing 10 to be tested to transmit the load. The force sensor 54 is arranged between the telescopic rod 521 and the elastic member 53 to detect the elastic force of the elastic member 53, thereby achieving accurate measurement of the applied load. This design has multiple advantages. First, the differential head 52 usually has high resolution, for example, it may only move 0.01 mm or less per revolution, which makes the adjustment of the load very accurate. Second, the use of the elastic member 53 can provide a relatively soft load transmission, avoiding the impact and vibration that may be caused by direct rigid connection. The elastic member 53 can be selected with different stiffness to adapt to different testing requirements. Finally, the introduction of the force sensor 54 makes it possible to measure the actual load applied to the radial air foil bearing in real time and accurately. This not only improves the accuracy of the test, but also makes it possible to conduct dynamic load testing, such as studying the effect of load changes on bearing performance.

[0032] Continuing to refer to Fig. 3 In the present embodiment, the outer peripheral wall of the radial air foil bearing 10 to be tested is provided with a connecting structure, and the elastic member 53 is connected to the radial air foil bearing 10 to be tested through the connecting structure. Specifically, the connecting structure can cooperate with one end of the elastic member 53 to achieve stable connection. The design of the connecting structure needs to consider the matching with the elastic member 53 to ensure the firmness and reliability of the connection.

[0033] In the present embodiment, the elastic member 53 is a spiral tension spring, and the connecting structure is a hook 101 matched with the spiral tension spring. The spiral tension spring as the elastic member 53 has good elastic properties and can provide uniform tension during loading. The hook 101 as the connecting structure can be firmly connected to the end of the spiral tension spring and is also convenient for quick assembly and disassembly with the outer peripheral wall of the radial air foil bearing 10 to be tested.

[0034] Continuing to refer to Fig. 2In the present embodiment, the positioning mechanism 4 comprises a base 41 and a limiting rod 42. The base 41 is fixedly connected to the bottom plate 1, and the limiting rod 42 is fixedly connected to the base 41 and extends upward. Specifically, the base 41 serves as the base part of the positioning mechanism 4, and provides stable support for the entire positioning system through the fixed connection with the bottom plate 1; the limiting rod 42 is the key component of the positioning mechanism 4, which is fixedly connected to the base 41 and extends upward, and can directly contact or cooperate with the radial air foil bearing 10 to be tested, thereby achieving the positioning and fixing of the bearing. The setting of the base 41 enables the positioning mechanism 4 to be stably installed on the test bench and not to be displaced due to vibration or load during the test process; the upward extension design of the limiting rod 42 enables it to better contact the bearing to be tested, providing more accurate positioning and fixing effect.

[0035] Continuing to refer to Fig. 3 In the present embodiment, the outer peripheral wall of the radial air foil bearing 10 to be tested is provided with a limiting structure matched with the limiting rod 42, for limiting the circumferential rotation of the radial air foil bearing 10 to be tested. Specifically, the limiting structure is a socket 102 matched with the top end of the limiting rod 42. This design of limiting structure is simple and effective, easy to implement, and will not interfere with the normal operation of the radial air foil bearing. In actual operation, the radial air foil bearing 10 to be tested can be first installed on the test shaft 2, then its position is adjusted to align the socket 102 with the limiting rod 42, and finally the limiting rod 42 is inserted into the socket 102 to complete the limiting.

[0036] In the present embodiment, the top end of the limiting rod 42 is conically arranged. The conical top end design has multiple advantages: first, it can more easily guide the limiting rod 42 into the socket 102 of the radial air foil bearing 10 to be tested, reducing friction and jamming during installation; second, the conical design can gradually increase the contact area during insertion, thereby providing more stable positioning effect.

[0037] In the present embodiment, the bottom of the bottom plate 1 is provided with shock-absorbing pads 11. Specifically, the shock-absorbing pads 11 can be arranged at the four corners of the bottom plate 1 or evenly distributed on the bottom of the bottom plate 1; the thickness and hardness of the shock-absorbing pads 11 can be selected according to the weight of the test bench and the expected vibration intensity; for example, rubber shock-absorbing pads 11 with a thickness of 10-30 mm and a hardness of 60-80 Shore A can be selected; this design not only absorbs external vibrations, but also reduces the transmission of vibrations generated by the test bench itself. Thus, the setting of the shock-absorbing pads 11 can significantly improve the stability of the test bench; during the test, especially under high-speed rotation conditions, external vibrations and vibrations generated by the test bench itself can affect the accuracy of the test results; through the setting of the shock-absorbing pads 11, these vibrations can be effectively isolated, making the rotation of the test shaft 2 more stable and the load applied by the loading mechanism 5 more accurate.

[0038] In the description of the embodiments of the present application, it should be noted that the terms of direction or position relationship such as "inner", "outer" and the like indicated in the description of the present application are based on the direction or position relationship shown in the drawings, which is merely for the convenience of description, and does not indicate or imply that the device or member must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0039] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "in this embodiment", "specific example" or "some examples" and the like means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the skilled person in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0040] The above is merely a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A radial air foil bearing test stand characterized by, include: Base plate (1), used to provide support; The test shaft (2) is rotatably mounted on the base plate (1) and extends in the horizontal direction; The drive motor (3) is connected to the test shaft (2) via a coupling. The free end of the test shaft (2) is used to pass through the inner hole of the radial air foil bearing (10) to be tested. The positioning mechanism (4) is provided on one side of the free end of the test shaft (2) for axially fixing the radial air foil bearing (10) to be tested. The positioning mechanism (4) includes a limiting member for restricting the circumferential rotation of the radial air foil bearing (10) to be tested. The loading mechanism (5) is located above the positioning mechanism (4) and fixed on the base plate (1). The loading mechanism (5) has a force-applying end for applying a vertical adjustment load to the radial air foil bearing (10) to be tested. A rotational speed measuring device is used to measure the rotational speed of the test shaft (2).

2. The radial air foil bearing test bench of claim 1, wherein, The loading mechanism (5) includes a fixed bracket (51), a micrometer head (52), an elastic element (53), and a force sensor (54). The fixed bracket (51) is mounted on the base plate (1). The main body of the micrometer head (52) is fixedly connected to the fixed bracket (51). The telescopic rod (521) of the micrometer head (52) is vertically adjustable and extended. The elastic element (53) is connected between the telescopic rod (521) of the micrometer head (52) and the radial air foil bearing (10) to be measured. The force sensor (54) is disposed between the telescopic rod (521) and the elastic element (53) and is used to detect the elastic force of the elastic element (53).

3. The radial air foil bearing test rig of claim 2 wherein, The outer peripheral wall of the radial air foil bearing (10) to be tested is provided with a connecting structure, and the elastic element (53) is connected to the radial air foil bearing (10) to be tested through the connecting structure.

4. The radial air foil bearing test rig of claim 3 wherein, The elastic element (53) is a helical tension spring, and the connecting structure is a hook (101) that matches the helical tension spring.

5. The radial air foil bearing test bench of claim 1, wherein, The positioning mechanism (4) includes a base (41) and a limiting rod (42). The base (41) is fixedly connected to the base plate (1), and the limiting rod (42) is fixedly connected to the base (41) and extends upward.

6. The radial air foil bearing test rig of claim 5 wherein, The outer peripheral wall of the radial air foil bearing (10) to be tested is provided with a limiting structure that cooperates with the limiting rod (42) to limit the circumferential rotation of the radial air foil bearing (10) to be tested.

7. The radial air foil bearing test rig of claim 6 wherein, The limiting structure is the insertion hole (102) at the top of the limiting rod (42).

8. The radial air foil bearing test rig of claim 7 wherein, The top of the limiting rod (42) is conical.

9. The radial air foil bearing test rig of claim 1 wherein, The bottom of the base plate (1) is provided with shock-absorbing pads (11).

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