Air bearing testing device

Abstract

The invention relates to the field of bearing testing, in particular to an air bearing testing device which comprises a high-precision platform, a high-speed motor and a thrust sensor, the thrust sensor is slidably connected to one end of the high-precision platform through a supporting frame, and the high-speed motor is fixed to the other end of the high-precision platform through a fixing base. A motor rotor is arranged in the high-speed motor, a bearing seat and a thrust plate are arranged at the end, facing the thrust sensor, of the motor rotor, an air bearing seat is arranged between the high-speed motor and the thrust sensor and slidably connected to the upper end face of the high-precision platform, and a probe head is arranged at the end, facing the air bearing seat, of the thrust sensor. An air bearing is installed on the side, facing the thrust plate, of the air bearing seat. By using the testing device, different types of air bearings can be replaced, the working rotating speed of the bearing can be controlled in real time, the load conditions in different working states can be recorded, an accurate testing means is provided for testing the dynamic pressure air bearing, and the development of the air bearing is facilitated.

Description

Technical Field

[0001] The invention relates to the field of air bearing testing, and in particular to an air bearing testing device. Background Art

[0002] The hydrodynamic air bearing is a contactless bearing. Its working principle is to use the compression effect of the wedge-shaped air film under the high-speed rotation of the rotor to generate air film pressure and provide bearing capacity, separating the contact surface between the shaft and the bearing. It has the advantages of high precision, no need for lubricating oil, longer service life, and low maintenance cost, and is widely used in today's society.

[0003] When the turbocharger's motor rotor rotates, the rotation of the thrust plate disturbs the surrounding air, forming a certain airflow and pressure distribution. This airflow and pressure distribution may produce thrust on the air bearing, thereby generating an axial load, which will affect the deformation and gas dynamic distribution of the air bearing, and further affect the performance and life of the air bearing.

[0004] The Chinese utility model patent with application number CN202122118964.4 discloses a radial air bearing testing device, including a motor, a rotor, an auxiliary support and a sliding guide rail. The motor is installed on a fixed platform, one end of the rotor is connected to the motor, and the other end is paired with a bearing. The bearing is arranged on the auxiliary support, and the auxiliary support is installed on the sliding guide rail. A locking nut is provided at one end of the rotor paired with the bearing, and the locking nut is tightened with the auxiliary support. A limited position tooling is provided on the sliding guide rail for fixing the position of the auxiliary support on the sliding guide rail.

[0005] Due to the difficulty in designing dynamic pressure air bearings and the errors in processing, air bearings need to undergo more testing experiments to complete the experiments to detect the magnitude of the force borne by the bearings and the consistency of the bearings. The above-mentioned testing device cannot meet this requirement. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides an air bearing testing device, which is specifically implemented by the following technical solutions: An air bearing testing device comprises a high-precision platform, a high-speed motor and a thrust sensor, wherein the thrust sensor is slidably connected to one end of the upper end surface of the high-precision platform via a support frame, and the high-speed motor is fixed to the other end of the upper end surface of the high-precision platform via a fixing seat, a motor rotor is arranged inside the high-speed motor, a bearing seat and a thrust plate are arranged at one end of the motor rotor facing the thrust sensor, an air bearing seat is arranged between the high-speed motor and the thrust sensor, the air bearing seat is slidably connected to the upper end surface of the high-precision platform, a detection needle is arranged at one end of the thrust sensor facing the air bearing seat, the detection needle abuts against the air bearing seat, and a side of the air bearing seat facing the thrust plate is used for installing an air bearing as a test piece, and the central axes of the air bearing, the thrust plate and the detection needle are collinear.

[0007] Preferably, a protective cover covering the bearing seat and the thrust plate is provided between the air bearing seat and the high-speed motor, the lower end of the protective cover is fixed to the upper end surface of the high-precision platform, and a hole is opened at one end of the protective cover facing the thrust sensor, the outer contour of the hole is adapted to the outer contour of the air bearing seat, and the air bearing seat is placed in the hole to close the protective cover.

[0008] Preferably, two groups of support seats are fixed to the upper end surface of the high-precision platform, the support frame is located between the two groups of support seats, a threaded through hole is provided on the support frame, a threaded rod passing through the threaded through hole is installed between the two groups of support seats, and a handwheel is provided at the end of the threaded rod away from the thrust sensor.

[0009] Preferably, the air bearing seat is provided with a measuring hole which penetrates through and faces the bearing seat, and a distance measuring sensor facing the measuring hole is installed on the side of the air bearing seat which faces the thrust sensor.

[0010] Preferably, the upper end surface of the high-precision platform is provided with a precision guide rail, the bottom of the support seat is provided with a locking slider 2 slidably connected to the precision guide rail, and the bottom of the air bearing seat is provided with a locking slider 1 slidably connected to the precision guide rail.

[0011] Preferably, it further comprises a speed measuring and controlling instrument arranged on one side of the high-speed motor, and the high-speed motor is electrically connected to the speed measuring and controlling instrument.

[0012] Preferably, the air bearing seat is provided with a plurality of concentric circles of mounting positions, and each circle of the mounting positions is composed of a plurality of groups of threaded holes distributed circumferentially.

[0013] After adopting the above technical solution, the beneficial effects of the present invention are: The present invention proposes an air bearing testing device, whose simple structure reduces the cost of research and development and testing. The testing device can be used to replace air bearings of different models, and the rotational speed of the bearings can be controlled in real time, and the load conditions under different working conditions can be recorded. For existing air bearings, the bearing consistency can be tested according to the actual use of the bearing clearance. For newly designed bearings, the optimal use clearance and rotational speed range can be determined by adjusting the clearance size and rotational speed size to increase the bearing service life. The device provides an accurate testing method for the testing of dynamic pressure air bearings, which is conducive to the development of air bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 Schematic diagram of the structure of the air bearing seat.

[0016] In the figure: 1-high-precision platform, 11-precision guide rail; 2-high-speed motor, 21-motor rotor, 22-bearing seat, 23-thrust plate; 3-protective cover; 4-air bearing seat, 41-measuring hole, 42-locking slider 1, 43-distance sensor, 44-threaded hole; 5-thrust sensor; 6-support frame, 61-locking slider 2; 7-threaded rod, 71-handwheel; 8-support seat; 9-air bearing. DETAILED DESCRIPTION

[0017] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0018] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0019] See also Figure 1 and Figure 2 An embodiment of the present invention provides an air bearing testing device, including a high-precision platform 1, a high-speed motor 2 and a thrust sensor 5. Its simple structure reduces the cost of research and development and testing of dynamic pressure air bearings. This testing device can replace different types of dynamic pressure air, and control the speed of the dynamic pressure air in real time, and record the load conditions under different working conditions, which provides an accurate testing method for the dynamic pressure test of dynamic pressure air and contributes to the development of dynamic pressure air.

[0020] The high-speed motor 2 is fixedly installed on one end of the upper end surface of the high-precision platform 1 through a fixed seat, and the thrust sensor 5 is slidably connected to the other end of the upper end surface of the high-precision platform 1 through a support frame 6. An air bearing seat 4 slidably connected to the high-precision platform 1 is arranged between the high-speed motor 2 and the thrust sensor 5.

[0021] A pair of parallel precision guide rails 11 are installed on the upper end surface of the high-precision platform 1. Locking sliders 42 corresponding to the precision guide rails 11 are installed on both sides of the bottom of the air bearing seat 4, and the locking sliders 42 are slidably connected to the precision guide rails 11. By locking the locking sliders 42, the stability of the air bearing seat 4 on the precision guide rails 11 can be ensured to prevent it from moving due to external force or vibration. Locking sliders 61 corresponding to the precision guide rails 11 are installed on both sides of the bottom of the support seat 6, and the locking sliders 61 are slidably connected to the precision guide rails 11. By locking the locking sliders 61, the stability of the support frame 6 on the precision guide rails 11 can be ensured to prevent it from moving due to external force or vibration.

[0022] The high-speed motor 2 is provided with a motor rotor 21 inside, and the end of the motor rotor 21 facing the thrust sensor 5 is provided with a bearing seat 22 (fixed to the housing of the high-speed motor 2, used to provide a mounting position for the motor rotor 21) and a thrust plate 23, and the size of the thrust plate 23 can be determined according to the size of the tested air bearing 9. The high-precision platform 1 is provided with a speed measuring and controlling instrument on one side of the high-speed motor 2, and the high-speed motor 2 is electrically connected to the speed measuring and controlling instrument. The speed measuring and controlling instrument can control and record the speed of the high-speed motor 2 in real time, and then test the load condition of the air bearing 9 under different working conditions.

[0023] A detection needle is provided at one end of the thrust sensor 5 facing the air bearing seat 4, and the detection needle abuts against the air bearing seat 4 during operation. An air bearing 9 is installed on the side of the air bearing seat 4 facing the thrust plate 23, and the central axes of the air bearing 9, the thrust plate 23 and the detection needle are collinear.

[0024] A protective cover 3 covering the bearing seat 22 and the thrust plate 23 is provided between the air bearing seat 4 and the high-speed motor 2, and the lower end of the protective cover 3 is fixed to the upper end surface of the high-precision platform 1. A hole is provided at one end of the protective cover 3 facing the thrust sensor 5, and the outer contour of the hole is adapted to the outer contour of the air bearing seat 4. The air bearing seat 4 is placed in the hole to seal the protective cover 3. The protective cover 3 and the air bearing seat 4 isolate the air bearing 9 and the thrust plate 23 from the outside world to simulate the closed environment of the air bearing 9 when it is working, so as to avoid external factors interfering with the test results of the air bearing 9, and the test data is closer to the actual use state.

[0025] Since the size specifications of different batches of air bearings 9 are not the same, in order to meet the installation requirements of air bearings 9 of various sizes, a number of concentric mounting positions are provided on the air bearing seat 4, and each mounting position is composed of a number of groups of threaded holes 44 distributed around. The air bearing seat 4 is provided with a measuring hole 41 that penetrates and faces the bearing seat 22, and a distance sensor 43 that faces and blocks the measuring hole 41 is installed on the side of the air bearing seat 4 facing the thrust sensor 5. The distance measurement result of the distance sensor 43 can be used to obtain the distance between the air bearing 9 and the thrust plate 23 (the relative position of the thrust plate 23 and the bearing seat 22 remains unchanged, and the relative position of the air bearing 9 and the air bearing seat 4 remains unchanged. The positional relationship between the air bearing 9 and the thrust plate 23 can be determined by determining the positional relationship between the distance sensor 43 and the bearing seat 22).

[0026] Two groups of support seats 8 are fixed on the upper end surface of the high-precision platform 1, and the support frame 6 is located between the two groups of support seats 8. A threaded through hole is provided on the support frame 6. A threaded rod 7 passing through the threaded through hole is installed between the two groups of support seats 8 through the bearing mounting seat, and a hand wheel 71 is provided at one end of the threaded rod 7 away from the thrust sensor 5. The hand wheel 71 is rotated to drive the threaded rod 7 to rotate, and the engagement of the threaded rod 7 with the threaded through hole makes the support frame 6 approach or move away from the air bearing seat 4 along the precision guide rail 11, thereby adjusting the position of the detection needle.

[0027] When testing with this testing device, first install the air bearing 9 to be tested on the front end surface of the air bearing seat 4 (the side facing the thrust plate 23), then pull the air bearing seat 4 along the precision guide rail 11 to approach the thrust plate 23 until the preset value of the distance sensor 43 is reached, and then lock the locking slider 1 42 to keep the relative position of the air bearing 9 unchanged. Next, rotate the hand wheel 71 to drive the threaded rod 7 to rotate, so that the support frame 6 approaches the air bearing seat 4 along the precision guide rail 11 until the detection needle contacts the back side of the air bearing seat 4 (the side facing away from the thrust plate 23), and then lock the locking slider 2 61, thereby fixing the thrust sensor 5.

[0028] Release the locking slider 42 and start the high-speed motor 2. By adjusting the parameters of the speed measuring and controlling instrument, the speed of the motor rotor 21 of the high-speed motor 2 is controlled and recorded. The motor rotor 21 drives the thrust plate 23 to rotate at high speed. The high-speed rotation of the thrust plate 23 will disturb the air in the protective cover 3, forming a certain airflow and pressure distribution. This airflow and pressure distribution will produce thrust on the air bearing 9 and thus generate an axial load. The thrust on the air bearing 9 is manifested as the movement of the air bearing seat 4 away from the thrust plate 23 along the precision guide rail 11. At this time, the air bearing seat 4 resists the detection needle of the thrust sensor 5. The thrust sensor 5 records the thrust on the air bearing 9 at the current speed. By changing the speed of the high-speed motor 2, the maximum pressure that the air bearing 9 can withstand is tested.

[0029] For existing air bearings 9, the consistency of the bearing can be tested based on the actual bearing clearance (the clearance between the air bearing 9 and the thrust plate 23), that is, when the clearance remains unchanged, thrust is applied to the air bearing 9 at a fixed speed, and it can be measured whether the force conditions of the air bearings 9 in this batch are consistent. For newly designed bearings, the optimal clearance and speed range can be determined by adjusting the clearance size and speed size to increase the service life of the bearing.

[0030] According to the embodiments of the present invention as described above, these embodiments do not describe all the details in detail, nor do they limit the invention to specific embodiments. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and the modified use based on the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An air bearing testing device, characterized in that: The invention comprises a high-precision platform (1), a high-speed motor (2) and a thrust sensor (5), wherein the thrust sensor (5) is slidably connected to one end of the upper end surface of the high-precision platform (1) via a support frame (6), and the high-speed motor (2) is fixed to the other end of the upper end surface of the high-precision platform (1) via a fixing seat, a motor rotor (21) is arranged inside the high-speed motor (2), and a bearing seat (22) and a thrust plate (23) are arranged at one end of the motor rotor (21) facing the thrust sensor (5). An air bearing seat (4) is arranged between the thrust sensor (2) and the thrust sensor (5), the air bearing seat (4) being slidably connected to the upper end surface of the high-precision platform (1), a detection needle is arranged at one end of the thrust sensor (5) facing the air bearing seat (4), the detection needle abuts against the air bearing seat (4), and the side of the air bearing seat (4) facing the thrust plate (23) is used to install an air bearing (9) as a test piece, and the central axes of the air bearing (9), the thrust plate (23) and the detection needle are collinear.

2. The air bearing testing device according to claim 1, characterized in that: A protective cover (3) covering the bearing seat (22) and the thrust plate (23) is arranged between the air bearing seat (4) and the high-speed motor (2); the lower end of the protective cover (3) is fixed to the upper end surface of the high-precision platform (1); a hole is formed at one end of the protective cover (3) facing the thrust sensor (5); the outer contour of the hole matches the outer contour of the air bearing seat (4); the air bearing seat (4) is placed in the hole to seal the protective cover (3).

3. The air bearing testing device according to claim 1, characterized in that: Two groups of support seats (8) are fixed to the upper end surface of the high-precision platform (1), the support frame (6) is located between the two groups of support seats (8), a threaded through hole is provided on the support frame (6), a threaded rod (7) passing through the threaded through hole is installed between the two groups of support seats (8), and a hand wheel (71) is provided at one end of the threaded rod (7) away from the thrust sensor (5).

4. The air bearing testing device according to any one of claims 2 or 3, characterized in that: The air bearing seat (4) is provided with a measuring hole (41) penetrating through and facing the bearing seat (22), and a distance measuring sensor (43) facing the measuring hole (41) is installed on a side of the air bearing seat (4) facing the thrust sensor (5).

5. The air bearing testing device according to claim 4, characterized in that: The upper end surface of the high-precision platform (1) is provided with a precision guide rail (11), the bottom of the support seat (6) is provided with a locking slider 2 (61) slidably connected to the precision guide rail (11), and the bottom of the air bearing seat (4) is provided with a locking slider 1 (42) slidably connected to the precision guide rail (11).

6. The air bearing testing device according to claim 1, characterized in that: It also includes a speed measuring and controlling instrument arranged on one side of the high-speed motor (2), and the high-speed motor (2) is electrically connected to the speed measuring and controlling instrument.

7. The air bearing testing device according to claim 1, characterized in that: The air bearing seat (4) is provided with a plurality of concentric circles of mounting positions, and each circle of the mounting positions is composed of a plurality of groups of threaded holes (44) distributed in a circumferential manner.

Images