CN113758816A

CN113758816A - Bump foil fatigue life test equipment

Info

Publication number: CN113758816A
Application number: CN202111177653.3A
Authority: CN
Inventors: 欧玉书; 张严; 朱建军
Original assignee: Dongguan Qingrui Technology Co ltd
Current assignee: Dongguan Qingrui Technology Co ltd
Priority date: 2021-10-09
Filing date: 2021-10-09
Publication date: 2021-12-07

Abstract

The application discloses ripples foil fatigue life test equipment, this test equipment includes: a test station comprising a base plate for carrying a foil; the loading mechanism comprises a driving assembly and a loading disc, the driving assembly comprises a cam and a pressing shaft, the cam is connected with the pressing shaft, and the pressing shaft is connected with the loading disc; a sensor module including a force sensor and a displacement sensor. According to the wave foil fatigue life testing equipment, a wave foil to be tested can be placed on the testing table, the driving assembly of the loading mechanism drives the pressing shaft to reciprocate through the cam, so that the loading disc can be pushed to extrude the wave foil on the testing table for multiple times, the loading force and displacement of the loading disc are detected through the force sensor and the displacement sensor of the sensor module in the extrusion process, and the fatigue life of the wave foil can be detected by combining the deformation quantity of the wave foil.

Description

Bump foil fatigue life test equipment

Technical Field

The disclosure relates to the field of test equipment, in particular to wave foil fatigue life test equipment.

Background

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

The foil air bearing is a dynamic pressure bearing. The dynamic pressure bearing utilizes gas as a lubricating medium, has the advantages of small friction, stable operation, high rotating speed and the like, and is widely applied to high-rotating-speed rotating machinery at present. Because the dynamic pressure bearing does not have auxiliary air source, open at the rotor and stop and when the rotor does not reach stable rotational speed, the ripples foil that plays the supporting role can receive the extrusion and produce the deformation, and the irreversible deformation degree of ripples foil is different, can influence whole foil air bearing's performance, and the deformation of ripples foil can directly influence foil air bearing's life-span.

Disclosure of Invention

In view of the above, it is necessary to provide a bump foil fatigue life testing apparatus for assisting in testing the fatigue life of a bump foil.

The present disclosure provides a bump foil fatigue life test apparatus, including:

a test station comprising a base plate for carrying a foil;

the loading mechanism comprises a driving assembly and a loading disc, the driving assembly comprises a cam and a pressing shaft, the cam is connected with the pressing shaft, the pressing shaft is connected with the loading disc and is used for driving the loading disc to reciprocate under the driving of the cam so as to repeatedly press the bump foil on the test table;

and the sensor module comprises a force sensor and a displacement sensor, the force sensor is used for detecting the loading force borne by the loading disc, and the displacement sensor is used for detecting the displacement of the loading disc so as to test the fatigue life of the bump foil through the loading force, the displacement and the deformation of the bump foil detected by the force sensor.

Preferably, the driving assembly includes a spring connected to the pressing shaft, and the pressing shaft compresses or stretches the spring when the cam presses the pressing shaft, so that the spring is deformed to reset the pressing shaft when the cam releases the pressing shaft.

Preferably, the device further comprises a frame and a driving motor, wherein the driving motor is arranged on the frame and connected to the cam to drive the cam to rotate.

Preferably, the driving assembly further comprises a sliding bearing connected to the test table and having a through hole extending in a length direction of the pressing shaft, and the pressing shaft is connected to the loading disc through the through hole.

Preferably, the driving assembly further comprises a pressing plate, the pressing plate is connected to the pressing shaft, the spring is sleeved on the pressing shaft, one end of the spring abuts against the pressing plate, and the other end of the spring abuts against the sliding bearing and is used for resetting the pressing shaft under the action of restoring force.

Preferably, the pressing shaft comprises a step, and the pressing plate is clamped on the step; the driving assembly further comprises a locking nut which is in threaded connection with the pressing shaft and abuts against the pressing plate so that the pressing plate abuts against the step.

Preferably, the force sensor is arranged between the pressing shaft and the loading disc, so that the pressing shaft is connected to the loading disc through the force sensor to detect the loading force of the loading disc.

Preferably, the displacement sensor is an eddy current displacement sensor, and the displacement sensor is connected to the test bench and close to the loading disc to measure the displacement of the loading disc.

Preferably, the test bench further comprises a support frame, and the displacement sensors are multiple and are symmetrically connected to the support frame relative to the pressing shaft.

Preferably, the supporting frame includes a connecting portion and a supporting portion, the connecting portion is disposed above the bottom plate in parallel, the supporting portion is connected to the connecting portion to support the connecting portion, and the loading tray is located between the connecting portion and the bottom plate.

Compared with the prior art, the wavy foil fatigue life testing equipment can place the wavy foil to be tested on the testing table, the driving component of the loading mechanism drives the pressing shaft to reciprocate through the cam, so that the loading disc can be pushed to extrude the wavy foil on the testing table for multiple times, the loading force and displacement of the loading disc are detected through the force sensor and the displacement sensor of the sensor module in the extrusion process, and the fatigue life of the wavy foil can be detected by combining the deformation quantity of the wavy foil. The wave foil fatigue life testing equipment has good universality, can replace wave foil sheets of different specifications, adjusts and selects a proper cam according to actual needs, can provide different pressures and displacement, and is simple in structure, convenient to operate and convenient to install and test.

Drawings

In order to illustrate the embodiments more clearly, the drawings that will be needed in the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are some examples of the disclosure, and that other drawings may be derived from those drawings by a person skilled in the art without inventive effort.

Fig. 1 is a schematic structural diagram of a bump foil fatigue life testing apparatus.

Fig. 2 is a schematic structural view of the driving assembly.

Fig. 3 is a schematic structural view of a driving motor, a cam and a pressing shaft.

Fig. 4 is a schematic view of the test table and the loading tray.

Description of the main elements

Rack	10
		Drive assembly	20
Driving motor	21
		Cam wheel	22
Pressing shaft	23
		Step	231
Sliding bearing	24
		Loading disc	25
Pressing plate	26
		Locking nut	261
Spring	27
		Displacement sensor	30
Force sensor	31
		Test board	40
Base plate	41
		Supporting part	42
Connecting part	43
		Bump foil	50

The following detailed description will further illustrate the disclosure in conjunction with the above-described figures.

Detailed Description

In order that the above objects, features and advantages of the present disclosure can be more clearly understood, a detailed description of the present disclosure will be given below with reference to the accompanying drawings and detailed description. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict. In the following description, numerous specific details are set forth to provide a thorough understanding of the present disclosure, and the described embodiments are merely a subset of the embodiments of the present disclosure, rather than a complete embodiment. All other embodiments, which can be derived by one of ordinary skill in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure.

In various embodiments, for convenience in description and not limitation of the disclosure, the term "coupled" as used in the specification and claims of the present disclosure is not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.

Fig. 1 is a schematic structural diagram of a bump foil fatigue life testing apparatus. As shown in fig. 1, the bump foil fatigue life test apparatus includes a frame 10, a test stand 40, a loading mechanism, and a sensor module. The test station 40 is used for carrying the bump foil 50 of the foil air bearing, and the loading mechanism is used for applying loading force to the bump foil 50 on the test station 40 repeatedly and repeatedly. The sensor module is used for detecting the loading force borne by the bump foil 50 and the displacement generated under the loading force, and testing the fatigue life of the bump foil 50 according to the deformation amount of the bump foil 50.

The rack 10 is used to carry the loading mechanism and sensor modules and houses the test stand 40. In this embodiment, the frame 10 is substantially a frame-shaped structure, and has a cavity therein. The loading mechanism is arranged on the rack 10, the test bench 40 is arranged in the cavity of the rack 10, and the loading mechanism penetrates through the rack 10 from the top of the rack 10 into the cavity, so that the bump foil 50 in the cavity can be tested. In some embodiments, the cavity may be closed, in other embodiments, the cavity may also be an open structure communicating with the outside, and a person skilled in the art may set the structure of the cavity as needed, which is not limited in this application.

Fig. 2 is a schematic structural view of the driving assembly 20. As shown in fig. 2, the loading mechanism is used to apply a loading force to the bump foil 50 of the test stand 40, and includes a drive assembly 20 and a loading tray 25. The driving assembly 20 is connected to the loading tray 25, and is used for driving the loading tray 25 to reciprocate so as to press the bump foil 50 located on the test table 40 multiple times. In some embodiments, the drive assembly 20 includes a drive motor 21, a cam 22, and a pressure shaft 23.

Fig. 3 is a schematic structural view of the drive motor 21, the cam 22, and the pressing shaft 23. As shown in fig. 2 and 3, a driving motor 21 is mounted on the top of the frame 10, and an output shaft of the driving motor 21 is connected to the cam 22 for driving the cam 22 to rotate. The cam 22 is a mechanical rotary member for transmitting motion to a rod that moves against its edge. Since the cam 22 is connected to the pressing shaft 23, and the pressing shaft 23 is connected to the loading disc 25, the pressing shaft 23 can drive the loading disc 25 to reciprocate to press the bump foil 50 on the test table 40 multiple times under the driving of the cam 22.

The pressing shaft 23 is a substantially long rod-like structure extending in a vertical direction. In some embodiments, the pressure shaft 23 may be rotatably connected to the cam 22 such that rotation of the cam 22 causes the pressure shaft 23 to move in a vertical direction. In the present embodiment, the pressing shaft 23 can reciprocate back and forth in the vertical direction under the pressing of the cam 22. Specifically, referring back to fig. 1, the driving assembly 20 further includes a sliding bearing 24, the sliding bearing 24 is connected to the testing table 40 and has a through hole extending along a length direction of the pressing shaft 23, and the pressing shaft 23 is connected to the loading disc 25 through the through hole. Thus, the pressing shaft 23 can move back and forth in the through hole of the sliding bearing 24 along the vertical direction, the sliding bearing 24 can be supported, the supporting degree of the pressing shaft 23 is improved, and the pressing shaft 23 is prevented from deforming.

In order to be able to bring the pressure shaft 23 back to its original position, the drive assembly 20 further comprises a spring 27 and a pressure plate 26. The pressure plate 26 is of a substantially flat plate-like structure, perpendicular to the pressure shaft 23 along its plane, and is connected to said pressure shaft 23 in a transverse direction. Specifically, a step 231 is provided at an end of the pressing shaft 23, and the pressing plate 26 is mounted on the pressing shaft 23, and one side surface thereof abuts against the step 231. The other side of the pressure plate 26 is screwed to the pressure shaft 23 by a lock nut 261, and the pressure plate 26 is attached to the pressure shaft 23 by abutting against a side surface of the pressure plate 26. The spring 27 is sleeved on the pressing shaft 23, and one end of the spring abuts against the pressing plate 26, and the other end of the spring abuts against the sliding bearing 24.

During operation, the cam 22 rotates to push the pressing shaft 23 to move downwards to compress the spring 27, so that the spring 27 is deformed. After the cam 22 rotates to the position where the pushing force to the pressing shaft 23 is cancelled, the pressing shaft 23 is returned by the restoring force of the spring 27 until next moved downward by being pushed by the cam 22.

The loading plate 25 has a substantially disc-shaped configuration, extends along a horizontal plane, and is connected to the bottom of the pressing shaft 23. During operation, the driving motor 21 and the cam 22 can drive the loading disc 25 to reciprocate in the vertical direction through the pressing shaft 23 to press the corrugated foil 50, so as to simulate the actual use condition of the foil air bearing.

Fig. 4 is a schematic view of the structure of test stand 40 and loading tray 25. As shown in fig. 4, the test table 40 is used to support the carrier foil 50 and support the end of the pressing shaft 23 by the sliding bearing 24 to improve the stability of the pressing shaft 23. The testing table 40 is a platform frame structure and comprises a bottom plate 41 and a supporting frame. The base plate 41 is of a generally flat plate-like configuration for mounting and carrying a wave foil 50 to be tested. The support frame includes a connection part 43 and a support part 42, the connection part 43 is disposed above the base plate 41 in parallel, and the support part 42 is connected to the connection part 43 to support the connection part 43 such that the loading tray 25 is located between the connection part 43 and the base plate 41.

As shown in fig. 4, the sensor module is used to detect various data in the fatigue life test of the bump foil sheet 50. Specifically, the sensor module includes a force sensor 31 and a displacement sensor 30. The force sensor 31 is used for detecting a loading force carried by the loading disc 25, and the displacement sensor 30 is used for detecting a displacement of the loading disc 25, so as to test the fatigue life of the bump foil 50 through the loading force, the displacement and the deformation of the bump foil 50 detected by the force sensor 31.

The displacement sensor 30 may be an eddy current displacement sensor 30, and may be a plurality of sensors, which are symmetrically connected to the test table 40 with respect to the pressing shaft 23 and end near the loading tray 25. In this embodiment, the displacement sensor 30 is substantially a rod-shaped structure, and the middle or the top of the displacement sensor 30 is connected to the connecting portion 43 of the test bench 40, and during the use process, the distance between the end of the displacement sensor 30 and the loading disc 25 can be adjusted according to actual needs, so that the displacement sensor 30 can sense the position of the loading disc 25 to measure the displacement of the loading disc 25.

The force sensor 31 is disposed between the ball pressing shaft 23 and the loading disc 25, such that the pressing shaft 23 is connected to the loading disc 25 through the force sensor 31 to detect the loading force of the loading disc 25.

During operation, after the wave foil fatigue life testing device is installed and debugged, the wave foil 50 is used for measuring various dimensional parameters on the visual measuring instrument, and then the wave foil 50 is fixed on the bottom plate 41, at this time, a certain gap is left between the loading disc 25 and the wave foil 50, and the probe of the displacement sensor 30 is positioned above the loading disc 25.

Then, the driving motor 21 is activated to rotate the cam 22, the cam 22 pushes the pressing shaft 23 to move downward, and the spring 27 pushes the pressing shaft 23 to return, so that the pressing shaft 23 reciprocates in the vertical direction. Wherein, the times of reciprocating motion are set by a control system, the force sensor 31 and the displacement sensor 30 are connected to a computer, and the acquired data are displayed and recorded on the computer.

After the extrusion for the predetermined times, the bump foil 50 is taken out, placed in a visual detector to measure the dimensional parameters again, compared with the parameters measured at the beginning, the deformation of the bump foil 50 is calculated, and the loading force and the displacement of the loading disc 25 are detected by the force sensor 31 and the displacement sensor 30 of the sensor module, so that the fatigue life of the bump foil 50 can be detected by combining the deformation amount of the bump foil 50. If the effect of different pressures and displacements on the fatigue life of the bump foil 50 needs to be measured, only the proper cam 22 needs to be selected.

The bump foil fatigue life testing device can place the bump foil 50 to be tested on the testing table 40, the driving component 20 of the loading mechanism drives the pressing shaft 23 to reciprocate through the cam 22, so that the loading disc 25 can be pushed to press the bump foil 50 on the testing table 40 for multiple times, and during the pressing process, the loading force and displacement of the loading disc 25 are detected through the force sensor 31 and the displacement sensor 30 of the sensor module, so that the fatigue life of the bump foil 50 can be detected in combination with the deformation amount of the bump foil 50. The wave foil fatigue life testing equipment has good universality, 50 wave foil sheets with different specifications can be replaced, and the influence of different pressures and displacement on the wave foil fatigue life can be tested by adjusting and selecting the proper cam 22 according to actual needs.

In several embodiments provided in the present disclosure, it will be apparent to those skilled in the art that the present disclosure is not limited to the details of the above-described exemplary embodiments, and can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the disclosure being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. The terms first, second, etc. are used to denote names, but not any particular order.

Although the present disclosure has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the present disclosure.

Claims

1. A bump foil fatigue life test apparatus, comprising:

a test station comprising a base plate for carrying a foil;

2. The bump foil fatigue life testing apparatus of claim 1, wherein the drive assembly includes a spring connected to the pressure shaft, the pressure shaft compressing or stretching the spring as the cam presses against the pressure shaft, causing the spring to deform and reset the pressure shaft as the cam releases the pressure shaft.

3. The bump foil fatigue life testing apparatus of claim 2, further comprising a frame and a drive motor disposed in the frame and connected to the cam to drive the cam to rotate.

4. The bump foil fatigue life test apparatus of claim 3, wherein the driving assembly further comprises a sliding bearing connected to the test table and having a through-hole extending in a length direction of the pressing shaft, the pressing shaft being connected to the loading plate through the through-hole.

5. The bump foil fatigue life test apparatus according to claim 4, wherein the driving assembly further comprises a pressing plate, the pressing plate is connected to the pressing shaft, the spring is sleeved on the pressing shaft, one end of the spring abuts against the pressing plate, and the other end of the spring abuts against the sliding bearing, and is used for resetting the pressing shaft under the action of restoring force.

6. The bump foil fatigue life test apparatus of claim 5, wherein the pressing shaft includes a step, the pressing plate being engaged with the step; the driving assembly further comprises a locking nut which is in threaded connection with the pressing shaft and abuts against the pressing plate so that the pressing plate abuts against the step.

7. The bump foil fatigue life test apparatus of claim 6, wherein the force sensor is provided between the pressing shaft and the loading disc such that the pressing shaft is connected to the loading disc through the force sensor to detect a loading force of the loading disc.

8. The bump foil fatigue life testing apparatus of claim 7, wherein the displacement sensor is an eddy current displacement sensor connected to the test table and adjacent to the loading tray to measure the displacement of the loading tray.

9. The bump foil fatigue life test apparatus of claim 8, wherein the test table further comprises a support frame, the displacement sensors being plural and connected to the support frame symmetrically with respect to the pressing axis.

10. The bump foil fatigue life test apparatus of claim 9, wherein the support frame includes a connection part disposed in parallel above the base plate, and a support part connected to the connection part to support the connection part, the loading tray being located between the connection part and the base plate.