Axial loading test equipment and method

Abstract

The present application discloses an axial loading test device and method, the axial loading test device comprises: a test bench, comprising a rotor and a support, the rotor being rotatably connected to the support through a foil air bearing; a loading mechanism, comprising a loading ring and a loading sleeve, the loading ring being connected to the rotor, the loading sleeve being sleeved on the loading ring, and forming a sealed space with the loading ring, and filling gas into the sealed space to apply an axial loading force to the rotor through the loading ring. The above-mentioned axial loading test device and method connect the loading ring of the loading mechanism to the rotor, the loading ring being sleeved on the loading sleeve, and forming a sealed space between the loading sleeve and the loading ring. During the axial test, air is filled into the sealed space, and the air pressure applies an axial loading force to the rotor through the loading ring. The axial force borne by the rotor during the test is gentle, the force is uniform, the control is precise, and the adaptability is strong.

Description

Technical Field

[0001] The present disclosure relates to the field of testing equipment, and in particular to an axial loading testing equipment and method. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art.

[0003] As a new type of dynamic pressure air bearing, foil air bearing has the advantages of high speed and rotation accuracy, low power consumption, no pollution, long life and the ability to work in harsh working environment as traditional gas bearings. It also has good adaptability, low manufacturing and assembly precision requirements, good impact resistance, high stability, no need for special lubrication and cooling systems, and low maintenance costs. It has been widely used in high-speed rotating machinery such as blowers, hydrogen fuel cell compressors, electronic turbochargers, aircraft environmental control systems (ACM), auxiliary power systems (APU), micro gas turbines, and small aviation turbine engines.

[0004] The performance test of foil air bearing includes many items, such as the need to apply axial force to the rotor connected to the foil air bearing for performance testing. The existing method of applying axial force mainly applies axial force to the rotor mechanically. However, this rigid loading method is fast, has a large impact on the rotor, is prone to uneven force, and may also damage the rotor during high-speed rotation. Summary of the invention

[0005] In view of the above, it is necessary to provide an axial loading test device and method for applying axial force to a rotor along the axial direction.

[0006] The present disclosure provides an axial loading test device, comprising:

[0007] A test bench including a rotor and a support, the rotor being rotationally connected to the support via a foil air bearing;

[0008] The loading mechanism comprises a loading ring and a loading sleeve, wherein the loading ring is connected to the rotor, the loading sleeve is sleeved on the loading ring and forms a sealed space with the loading ring, and gas is filled into the sealed space to apply an axial loading force to the rotor through the loading ring.

[0009] Preferably, the test bench further comprises a driving machine, wherein the driving machine is connected to the rotor to drive the rotor to rotate.

[0010] Preferably, the driving machine comprises an impeller, the impeller is connected to the rotor, and when airflow is introduced toward the impeller, the impeller rotates to drive the rotor to rotate.

[0011] Preferably, the test bench further comprises a speed sensor for detecting the rotational speed of the rotor. After the rotational speed of the rotor reaches a preset value, gas is filled into the sealed space to apply an axial loading force to the rotor through the loading ring.

[0012] Preferably, the loading ring comprises an inner ring and an outer ring, the inner ring is connected to the rotor, and the outer ring is connected to the inner ring; an opening is provided at the end of the loading sleeve, and the outer ring is movably accommodated in the opening of the loading sleeve along the axial direction to form the sealed space.

[0013] Preferably, the loading mechanism further comprises a force sensor, and the force sensor is connected to the loading sleeve to detect the loading force of the detection sleeve.

[0014] Preferably, the loading mechanism further comprises a bracket and a loading shaft, one end of the loading shaft is axially connected to the loading sleeve, and the other end is rotatably connected to the bracket through the force sensor.

[0015] Preferably, the loading mechanism also includes a connecting rod and a linear bearing seat, one end of the connecting rod is connected to the force sensor, and the other end is rotatably connected to the bracket; the linear bearing seat is movably connected to the loading shaft along the axial direction of the loading shaft to support the loading shaft.

[0016] In addition, the present disclosure also provides an axial loading test method, comprising:

[0017] Filling the sealed space with gas until the air pressure in the sealed space reaches a preset value;

[0018] The gas in the sealed space presses the rotor to apply an axial loading force to the rotor.

[0019] Preferably, before filling the sealed space with gas, the method further includes rotating the rotor until the rotation speed of the rotor is equal to or greater than a preset value; or, after filling the sealed space with gas until the gas pressure in the sealed space reaches a preset value, the method further includes rotating the rotor until the rotation speed of the rotor is equal to or greater than a preset value.

[0020] Compared with the prior art, the above-mentioned axial loading test equipment and method form a sealed space between the loading sleeve and the loading ring by connecting the loading ring of the loading mechanism to the rotor. During the axial test, air is filled into the sealed space, and the air pressure applies an axial loading force to the rotor through the loading ring. The axial force borne by the rotor during the test is gentle, uniform, and precisely controlled. It has the characteristics of strong adaptability, which not only protects the test bench from impact and overload damage, prolongs the life of the rotor and foil air bearing, but also meets the test requirements of stable axial loading. Moreover, the above-mentioned axial loading test equipment has a simple structure, low cost, and is relatively convenient to build and debug. It has good versatility and can meet the testing requirements of thrust foil air bearings of different rotors and different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods, the drawings required for use in the description of the implementation methods will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 It is a structural schematic diagram of the axial loading test equipment.

[0023] Figure 2 It is a schematic diagram of the cross-sectional structure of the axial loading test equipment.

[0024] Figure 3 Schematic diagram of the test bench structure.

[0025] Figure 4 It is a structural diagram of the loading mechanism.

[0026] Figure 5 It is a structural schematic diagram of the loading mechanism in the disassembled state.

[0027] Figure 6 It is a schematic diagram of the structure of the rotor and the loading ring.

[0028] Figure 7 It is a schematic diagram of the structure of the loading sleeve and the loading shaft.

[0029] Main component symbols

[0030]

[0031]

[0032] The following specific implementations will further illustrate the present disclosure in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0033] In order to more clearly understand the above-mentioned purposes, features and advantages of the present disclosure, the present disclosure is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present disclosure, and the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present disclosure belongs. The terms used in the specification herein are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0035] In each embodiment, for the convenience of description and not to limit the present disclosure, the term "connection" used in the patent specification and claims of the present disclosure is not limited to physical or mechanical connection, but may include electrical connection, whether direct or indirect. "Up", "down", "below", "left", "right", etc. are only used to indicate relative position relationship. When the absolute position of the described object changes, the relative position relationship also changes accordingly.

[0036] Figure 1 It is a schematic diagram of the structure of the axial loading test equipment. Figure 2 It is a schematic diagram of the cross-sectional structure of the axial loading test equipment. Figure 1 and Figure 2 As shown, the axial loading test equipment is used to apply an axial loading force to the rotor 14. During the axial test of the foil air bearing 15, it is necessary to apply an axial loading force to the rotor 14 during the high-speed rotation of the rotor 14 to test the axial bearing capacity of the foil air bearing 15. Existing mechanical loading methods such as impacting or squeezing the rotor 14 with a loading rod inevitably have an impact effect on the rotor 14, which is prone to uneven force and may also damage the rotor 14 and the foil air bearing 15 rotating at high speed.

[0037] The axial loading test equipment includes a test bench 10 and a loading mechanism 20. The test bench 10 is used to install the foil air bearing 15 and the rotor 14. The rotor 14 can rotate at high speed through the foil air bearing 15, so as to simulate the working condition of the foil air bearing 15. The loading mechanism 20 is used to apply a loading force to the rotor 14 along the axial direction of the rotor 14. According to the actual test situation, the axial loading force can be applied when the rotor 14 is stationary. However, in more cases, the embodiments provided in the present application are particularly suitable for applying the axial loading force when the rotor 14 rotates at high speed.

[0038] Figure 3 The structural diagram of the test bench 10 is shown in FIG. Figure 1-3 As shown, the test bench 10 includes a speed sensor 13, a rotor 14, a support 12 and a driving machine 11. The rotor 14 is rotatably connected to the support 12 through a foil air bearing 15, and the driving machine 11 is connected to the rotor 14 to drive the rotor 14 to rotate highly. The speed sensor 13 is close to the rotor 14 and is used to detect the rotation speed of the rotor 14.

[0039] The support 12 is used to support the rotor 14, the drive motor 11 and other components of the test bench 10, and includes a cavity that runs through in the axial direction, in which a foil air bearing 15 is installed. The rotor 14 is installed in the cavity in the axial direction, and the middle part is connected to the foil air bearing 15, and the two ends extend from the two ends of the cavity respectively. In this way, the rotor 14 can rotate at a high degree in the cavity under the support of the foil air bearing 15. The drive motor 11 is connected to one end (i.e. Figure 2 The rear end shown in the figure) is used to drive the rotor 14 to rotate. In some embodiments, the driving machine 11 includes an impeller, which is connected to the rotor 14. When an airflow is introduced toward the impeller, the impeller rotates to drive the rotor 14 to rotate. During the test, the flow rate and flow velocity of the introduced airflow can be set as needed to control the rotation speed of the rotor 14, so that the rotation condition of the rotor 14 can be determined by the rotation speed, such as whether it has entered a stable state. In some other embodiments, the driving machine 11 can also be other components, such as motors, gasoline engines and other equipment, which are used to drive the rotor 14 to rotate at a high speed. The probe of the speed sensor 13 is close to the rotor 14 along the radial direction of the rotor 14, and is used to detect the rotation speed of the rotor 14. For example, it can be in the form of a photoelectric speed sensor 13, a magnetoelectric speed sensor 13, etc.

[0040] Figure 4 is a schematic structural diagram of the loading mechanism 20, Figure 5 2 is a schematic diagram of the structure of the loading mechanism 20 in a disassembled state. Figure 4 and Figure 5As shown, the loading mechanism 20 includes a loading ring 27, a loading sleeve 21, a loading shaft 22, a linear bearing seat 23, a force sensor 24 and a bracket 26. The loading ring 27 and the loading sleeve 21 are used to form a sealed space 213, and an axial loading force is applied to the rotor 14 by filling the sealed space 213 with gas. The loading shaft 22 and the force sensor 24 are used to detect the pressure of the gas in the sealed space 213, so that the magnitude of the loading force can be detected. The linear bearing seat 23 and the bracket 26 are used to support the loading shaft 22 and the force sensor 24. The loading shaft 22 can rotate under the support of the linear bearing seat 23 and the bracket 26, and the loading shaft 22 can be prevented from moving axially under the thrust of the enclosed air, ensuring that the force sensor 24 can correctly detect the pressure in the sealed space 213.

[0041] Figure 6 Schematic diagram of the structure of the rotor 14 and the loading ring 27. Figure 2 , Figure 5 and Figure 6 As shown, the loading ring 27 is connected to the rotor 14, and the loading sleeve 21 is sleeved on the loading ring 27 to form a sealed space 213 with the loading ring 27. Gas is filled into the sealed space 213 to apply an axial loading force to the rotor 14 through the loading ring 27. The loading ring 27 includes an inner ring 271 and an outer ring 272. The inner ring 271 is sleeved on the rotor 14 and can move axially with the rotor 14. The outer ring 272 is connected to the inner ring 271, and the outer ring 272 and the inner ring 271 are connected by a plane, and there is no gap between the outer ring 272 and the inner ring 271, forming an integrated structure.

[0042] Figure 7 2 is a schematic diagram of the structure of the loading sleeve 21 and the loading shaft 22. Figure 7 As shown, the loading sleeve 21 is generally a cylindrical tube structure with an open cavity inside. For ease of description, the end where the opening is located is called the open end 212, and the other end is called the sealed end. The loading shaft 22 is generally a rod-shaped structure, one end of which is connected to the side wall of the sealed end of the loading sleeve 21 through a locking nut, and the other end extends along the axial direction of the loading sleeve 21 and in a direction away from the loading sleeve 21.

[0043] Please review Figure 2 and Figure 5, the outer ring 272 is movably accommodated in the open opening of the outer ring 272 in the axial direction, so that the loading ring 27 and the loading sleeve 21 form a structure similar to a hydraulic cylinder, wherein the loading sleeve 21 is similar to a cylinder, and the loading ring 27 is similar to a piston. By accommodating the loading ring 27 in the housing of the sleeve in the axial direction, the loading ring 27 and the closed end of the loading sleeve 21 form a sealed space 213. In this embodiment, a through hole 211 is provided in the portion of the loading sleeve 21 located in the sealed space 213, which is used to fill the sealed space 213 with gas from the through hole 211. During the test, after detecting that the rotation speed of the rotor 14 reaches a preset value, gas is filled into the through hole 211 of the sealed space 213 to apply an axial loading force to the rotor 14 through the loading ring 27.

[0044] The force sensor 24 is connected to the loading sleeve 21 to detect the loading force of the detection sleeve. Specifically, one end of the loading shaft 22 is fixedly connected to the loading sleeve 21 along the axial direction, and the other end passes through the linear bearing seat 23 and is connected to the force sensor 24. The linear bearing seat 23 is a linear motion system used for unlimited stroke and for use with the cylindrical loading shaft 22. The loading shaft 22 can rotate relative to the linear bearing seat 23, and can also move back and forth axially relative to the linear bearing seat 23. In this way, the linear bearing seat 23 can be movably connected to the loading shaft 22 along the axial direction of the loading shaft 22 to support the loading shaft 22.

[0045] One end of the force sensor 24 is connected to the loading shaft 22 , and the other end is connected to the connecting rod 25 . The connecting rod 25 extends along the axial direction of the loading shaft 22 , and the other end is rotatably connected to the bracket 26 , and the connecting rod 25 is supported by the bracket 26 .

[0046] The following describes in detail an axial loading test method implemented using the above axial loading test device. The axial loading test method includes the following steps:

[0047] First, the components of the axial loading test equipment are installed and debugged, and the impeller is blown by external airflow to start rotating according to the test requirements, and the impeller can drive the rotor 14 to rotate.

[0048] During the rotation process, the speed sensor 13 collects the speed signal of the rotor 14 , and when the speed of the rotor 14 reaches a stable speed, the rotor 14 separates from the foil air bearing 15 and rotates at a high speed.

[0049] Then, according to the test requirements, gas is introduced into the loading sleeve 21 until the air pressure in the sealed space 213 reaches a preset value. Due to the effect of the air pressure, the air pressure in the sealed space 213 applies an axial force to the loading ring 27, so that the loading shaft 22 can also bear the axial loading force through the loading ring 27. At the same time, the force sensor 24 can also collect data through the loading shaft 22 and transmit it to the computer, and the loading force borne by the loading shaft 22 can be calculated based on the collected data.

[0050] However, in other embodiments, according to the test requirements, gas may be introduced into the loading sleeve 21 before the rotor 14 is started to simulate another working condition. During the test, the speed of the rotor 14 and the loading force may be changed to sample data under different conditions to obtain the corresponding axial load capacity.

[0051] The above-mentioned axial loading test equipment and method form a sealed space 213 between the loading sleeve 21 and the loading ring 27 by connecting the loading ring 27 of the loading mechanism 20 to the rotor 14. The loading ring 27 is sleeved on the loading sleeve 21. During the axial test, air is filled into the sealed space 213, and the air pressure of the air applies an axial loading force to the rotor 14 through the loading ring 27. The axial force borne by the rotor 14 during the test is gentle, uniform, accurately controlled, and highly adaptive. It not only protects the test bench 10 from impact and overload damage, prolongs the life of the rotor 14 and the foil air bearing 15, but also meets the test requirements of stable axial loading. Moreover, the above-mentioned axial loading test equipment has a simple structure, low cost, convenient equipment construction and debugging, good versatility, and can meet the test requirements of different rotors 14 and thrust foil air bearings 15 of different sizes, which is of great help to the research on the performance of the foil air bearing 15.

[0052] In the several specific embodiments provided in the present disclosure, it is obvious to those skilled in the art that the present disclosure is not limited to the details of the above exemplary embodiments, and that the present disclosure can be implemented in other specific forms without departing from the spirit or basic features of the present disclosure. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present disclosure is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present disclosure. In addition, it is obvious that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. The words first, second, etc. are used to indicate names, and do not indicate any particular order.

[0053] The above embodiments are only used to illustrate the technical solution of the present disclosure rather than to limit it. Although the present disclosure is described in detail with reference to the above preferred embodiments, those skilled in the art should understand that the technical solution of the present disclosure can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present disclosure.

Claims

1. An axial loading test device, characterized in that: include: A test bench including a rotor and a support, the rotor being rotationally connected to the support via a foil air bearing; A loading mechanism, comprising a loading ring and a loading sleeve, wherein the loading ring is connected to the rotor, the loading sleeve is sleeved on the loading ring and forms a sealed space with the loading ring, and gas is filled into the sealed space to apply an axial loading force to the rotor through the loading ring; The loading mechanism further includes a force sensor, which is connected to the loading sleeve to detect the loading force of the loading sleeve; The loading mechanism further includes a bracket and a loading shaft, one end of the loading shaft is axially connected to the loading sleeve, and the other end is rotatably connected to the bracket through the force sensor, and the loading shaft and the force sensor are used to detect the pressure of the gas in the sealed space, thereby detecting the magnitude of the loading force; The test bench further includes a speed sensor for detecting the rotation speed of the rotor, and after the rotation speed of the rotor reaches a preset value, gas is filled into the sealed space to apply an axial loading force to the rotor through the loading ring; The loading ring includes an inner ring and an outer ring, the inner ring is connected to the rotor, and the outer ring is connected to the inner ring; an opening is provided at the end of the loading sleeve, and the outer ring is movably accommodated in the opening of the loading sleeve along the axial direction to form the sealed space.

2. The axial loading test device according to claim 1, characterized in that: The test bench further includes a driving machine connected to the rotor to drive the rotor to rotate.

3. The axial loading test device according to claim 2, characterized in that: The driving machine includes an impeller connected to the rotor. When airflow is introduced toward the impeller, the impeller rotates to drive the rotor to rotate.

4. The axial loading test device according to claim 1, characterized in that: The loading mechanism also includes a connecting rod and a linear bearing seat, one end of the connecting rod is connected to the force sensor, and the other end is rotatably connected to the bracket; the linear bearing seat is movably connected to the loading shaft along the axial direction of the loading shaft to support the loading shaft.

5. An axial loading test method, characterized in that: The method is applied to the axial loading test device according to any one of claims 1 to 4, comprising: Filling the sealed space with gas until the air pressure in the sealed space reaches a preset value; The gas in the sealed space squeezes the rotor to apply an axial loading force to the rotor; The loading shaft and the force sensor are used to detect the pressure of the gas in the sealed space, thereby detecting the magnitude of the loading force.

6. The axial loading test method according to claim 5, characterized in that: Before the gas is filled into the sealed space, the method further includes rotating the rotor until the rotation speed of the rotor is equal to or greater than a preset value.

Images