Radial test apparatus for radial foil gas bearings

Abstract

The application relates to a radial test device of a radial foil gas bearing, comprising: a fixed sleeve, including an inner ring fixed sleeve for installing the radial foil gas bearing; a sensor module, including a displacement sensor extending along the radial direction of the inner ring fixed sleeve, which is used for measuring the radial displacement of a rotor when the foil air bearing is inserted into the inner ring fixed sleeve and rotates. The radial test device of the radial foil gas bearing can insert the rotor into the inner ring fixed sleeve when testing is needed, so that the displacement sensor of the sensor module can test the displacement of the rotor in the horizontal and vertical directions during high-speed rotation, and radial test operation of the foil gas bearing is realized.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of performance testing equipment for gas bearings, in particular, a radial testing equipment for a radial foil gas bearing. BACKGROUND

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

[0003] As a new type of dynamic pressure air bearing, the foil air bearing has the advantages of high rotation speed and rotation accuracy, low power consumption, no pollution, long service life, and the ability to work in harsh working environments, in addition to the advantages of good self-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 air 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 static and dynamic performance of the radial foil gas bearing is of great significance to the stability of the entire rotating motion system. However, there is no unified standard for testing foil gas bearings at present, and the test benches built are relatively simple, with low testing accuracy and complicated installation procedures. With the growing demand for foil gas bearings in China, the performance testing of bearings needs to be more perfect, and therefore, it is very important to design a device that can accurately test the radial foil gas bearing. SUMMARY

[0005] In view of the above, it is necessary to provide a radial testing equipment for a radial foil gas bearing for assisting in testing the radial displacement of the foil gas bearing.

[0006] The present disclosure provides a radial testing equipment for a radial foil gas bearing, comprising:

[0007] A fixed sleeve, comprising an inner ring fixed sleeve, the inner ring fixed sleeve is used for installing the radial foil gas bearing;

[0008] A sensor module, comprising a displacement sensor, the displacement sensor extends along the radial direction of the inner ring fixed sleeve, when the foil air bearing in the inner ring fixed sleeve is sleeved with the rotor and rotates, the displacement sensor is used for measuring the radial displacement of the rotor.

[0009] Preferably, the sensor module further comprises an acceleration sensor connected to the fixed sleeve for detecting the acceleration of the sleeve sleeved on the fixed sleeve.

[0010] Preferably, the sensor module further comprises a force sensor connected to the fixing sleeve for detecting the bearing force of the fixing sleeve.

[0011] Preferably, the fixing sleeve further comprises a lifting ring connected to the fixing sleeve, and the force sensor is connected to the lifting ring through a connecting rope.

[0012] Preferably, the sensor module further comprises a force arm rod connected to the inner ring fixing sleeve in the radial direction; when the rotor rotates in the radial foil gas bearing in the inner ring fixing sleeve, the force arm rod detects the rotational torque of the inner ring fixing sleeve through the force sensor.

[0013] Preferably, the fixing sleeve further comprises an outer ring fixing sleeve, which accommodates the inner ring fixing sleeve and is coaxially and rotatably connected to the inner ring fixing sleeve.

[0014] The outer ring fixing sleeve is provided with a through hole extending in the circumferential direction, and the force arm rod is connected to the inner ring fixing sleeve through the through hole; when the rotor rotates in the radial foil gas bearing in the inner ring fixing sleeve, the gas film between the rotor and the foil air bearing drives the inner ring fixing sleeve rotor, and the inner ring fixing sleeve pulls the force arm rod to detect the rotational torque of the inner ring fixing sleeve through the force sensor.

[0015] Preferably, the fixing sleeve further comprises an intermediate assembly, and the outer ring fixing sleeve is coaxially and rotatably connected to the inner ring fixing sleeve through the intermediate assembly.

[0016] The intermediate assembly comprises a first bearing, a spacer sleeve and a second bearing, the first bearing and the second bearing are sleeved between the inner ring fixing sleeve and the outer ring fixing sleeve, so that the inner ring fixing sleeve is rotatably connected to the outer ring fixing sleeve through the first bearing; the spacer sleeve is sleeved on the inner ring fixing sleeve and located between the first bearing and the second bearing.

[0017] Preferably, the outer side surface of the inner ring fixing sleeve is provided with a mounting hole extending in the radial direction, and the force arm rod is connected to the mounting hole in sequence through the outer ring fixing sleeve and the spacer sleeve.

[0018] Preferably, the intermediate assembly further comprises a retaining ring connected between the inner end surface of the outer ring fixing sleeve and the outer end surface of the first bearing to block the first bearing in the axial direction of the first bearing, and the inner side surface of the inner ring fixing sleeve is provided with a groove for mounting the wave foil, and the end is provided with a pressing piece for fixing the wave foil.

[0019] Preferably, the sensor module further comprises a connecting plate provided with an elongated hole extending along the axial direction of the outer fixing sleeve, the connecting plate is connected to the outer fixing sleeve through a connecting member penetrating through the elongated hole, and the displacement sensor is connected to the connecting plate and extends along the radial direction of the outer fixing sleeve.

[0020] Compared with the prior art, the radial test device of the radial foil gas bearing described above can test the radial displacement of the rotor in the horizontal and vertical directions by arranging the displacement sensor on the fixing sleeve, inserting the rotor into the inner fixing sleeve of the fixing sleeve when testing is needed, and detecting the radial displacement of the rotor during high-speed rotation of the rotor, so as to realize the test of the radial performance of the foil gas bearing. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments, the drawings required to be used in the description of the embodiments will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0022] Figure 1 is a structural schematic diagram of the radial test device of the radial foil gas bearing.

[0023] Figure 2 is a structural schematic diagram of the radial test device of the radial foil gas bearing from another perspective.

[0024] Figure 3 is a sectional structural schematic diagram of the radial test device.

[0025] Figure 4 is a structural schematic diagram of the inner fixing sleeve and the intermediate assembly in a disassembled state.

[0026] Figure 5 is a structural schematic diagram of the inner fixing sleeve.

[0027] Main element symbol explanation

[0028]

[0029]

[0030] The following specific embodiments will further illustrate the present disclosure in combination with the above drawings. DETAILED DESCRIPTION

[0031] 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 the embodiments of the present application and the features in the embodiments can be combined with each other without conflict. In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present disclosure. The described embodiments are only some of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work under the premise that there is no conflict, all belong to the scope of protection of the present disclosure.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. The terminology used in the specification herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure.

[0033] In various embodiments, for the purpose of facilitating description without limiting the present disclosure, the term "connected" used in the patent application specification and claims of the present disclosure is not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect. "Up", "down", "below", "left", "right", and the like are only used to represent relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship also changes accordingly.

[0034] Figure 1 is a structural schematic diagram of a radial test device of a radial foil gas bearing. As shown in Figure 1 , the radial test device of the radial foil gas bearing includes a fixed sleeve and a sensor module. The fixed sleeve includes an outer ring fixed sleeve 10, an inner ring fixed sleeve 20, and an intermediate assembly. The intermediate assembly is arranged between the inner ring fixed sleeve 20 and the outer ring fixed sleeve 10, so that the inner ring fixed sleeve 20 and the outer ring fixed sleeve 10 can rotate coaxially relative to each other. The sensor module is mounted on the outer ring fixed sleeve 10 and the inner ring fixed sleeve 20, and is used to test one or more parameters in the radial direction of the radial foil gas bearing, and complete the radial test of the radial foil gas bearing.

[0035] As shown in Figure 1As shown, the outer ring fixing sleeve 10 is generally cylindrical in structure, and has a through hole extending along the axial direction. A baffle 11 is arranged at at least one end of the outer ring fixing sleeve 10, and the baffle 11 can be connected to the end face of the outer ring fixing sleeve 10 through one or more connecting members. In the embodiment, the baffle 11 is coaxial with the outer ring fixing sleeve 10, but the inner diameter of the baffle 11 is smaller than the through hole of the outer ring fixing sleeve 10, so that the baffle 11 can stop the components inside the outer ring fixing sleeve 10 in the circumferential direction. In some embodiments, the top of the outer ring fixing sleeve 10 is also provided with a lifting ring 12, so that the rope 121 can be connected to the lifting ring 12 and the components such as force sensors, so as to test the static performance of the radial foil gas bearing, and facilitate the transportation and installation of the radial test equipment.

[0036] Figure 2 is a structural schematic diagram of the radial test equipment of the radial foil gas bearing from another perspective. As shown in Figure 1 and Figure 2 shown, the sensor module is mounted on the outer ring fixing sleeve 10. In some embodiments, according to actual needs, the sensor module can include a displacement sensor 30, an acceleration sensor 32 and a force arm rod 33 for connecting a force sensor.

[0037] The number of displacement sensors 30 can be one or more, which can be an eddy current displacement sensor, used for testing the radial displacement of the rotor. Specifically, the displacement sensor 30 is generally in the form of a long rod, which is connected to the outer ring fixing sleeve 10 through a connecting plate 31. The connecting plate 31 is generally in the form of a long strip, one end of which is provided with a long hole 311 extending along the axial direction of the outer ring fixing sleeve 10, and the other end is connected to the displacement sensor 30. In the embodiment, the number of displacement sensors 30 is one pair, which is symmetrically connected to the outer ring fixing sleeve 10 through the median line of the lifting ring 12. When installed, the connecting member can be connected to the outer ring fixing sleeve 10 through the long hole 311, and the displacement sensor 30 extends in the radial direction of the outer ring fixing sleeve 10, which is used for testing the radial runout of the rotor when the rotor is installed in the radial test equipment.

[0038] The acceleration sensor 32 is used for detecting the acceleration of the fixing sleeve, and during the test, the acceleration sensor 32 can be used for testing the acceleration of the displacement during loading and excitation. The acceleration sensor 32 can be in the form of a capacitor, an inductor, a strain, a piezoresistive, a piezoelectric structure, which is connected to the outer ring fixing sleeve 10 and extends in the radial direction of the outer ring fixing sleeve 10, and is used for detecting the acceleration of the whole during the static test and dynamic test.

[0039] Figure 3 is a sectional structural schematic diagram of the radial test equipment. As shown in Figure 3As shown, the force arm rod 33 is generally in a rod structure, and the end thereof is connected to the mounting hole 22 of the inner sleeve through the through hole of the outer sleeve. In use, a force sensor can be mounted on the force arm rod 33, and the force arm rod 33 detects the rotating torque of the inner sleeve 10 through the force sensor. In this way, the force sensor can measure the rotating force acting on the radial foil bearing due to the friction force of the rotor or the gas film (i.e., the friction torque).

[0040] In this way, the signal detected by the sensor module can be amplified and introduced into a computer for processing to obtain a series of static and dynamic performances of the radial foil gas bearing. In some embodiments, the displacement sensor 30 and the acceleration sensor 32 are symmetrically arranged on both sides of the hanger ring 12 relative to the central axis of the hanger ring 12.

[0041] Figure 4 is a structural schematic diagram of the inner sleeve 20 and the intermediate assembly in a disassembled state. As shown, Figure 4 The inner sleeve 20 is used to mount the radial foil gas bearing. The intermediate assembly is connected to the radially outer side of the inner sleeve 20 and the radially inner side of the outer sleeve 10, i.e., between the inner sleeve 20 and the outer sleeve 10, so that the inner sleeve 20 and the outer sleeve 10 can rotate relative to the coaxial height.

[0042] Figure 5 is a structural schematic diagram of the inner sleeve 20. As shown, Figure 5 The inner sleeve 20 is generally in a cylindrical structure, and has a through hole extending in the axial direction. A groove for mounting the wave foil is provided on the inner wall passing through, and the groove extends in the axial direction and has a cross section in the shape of "L", so that the wave foil can be embedded in the groove and fixed by the pressing sheet 21. The pressing sheet 21 is in a sheet structure, can be fixed to the end face of the inner sleeve 20 by the screw 211, and covers the end face of the groove, so as to fix the wave foil.

[0043] Please refer back to Figure 4 and Figure 5The middle part of the inner ring fixing sleeve 20 has a radial dimension larger than the two ends, forming a "convex" structure. The middle assembly includes a first bearing 42, a second bearing 40 and a spacer sleeve 41. The first bearing 42 and the second bearing 40 are deep groove ball bearings, respectively sleeved on the two ends of the inner ring fixing sleeve 20 and located between the inner ring fixing sleeve 20 and the outer ring fixing sleeve 10, so that the inner ring fixing sleeve 20 is rotatably connected to the outer ring fixing sleeve 10 through the first bearing 42. In order to stop the first bearing 42, the middle assembly further includes a stop ring 43 connected between the inner end face of the outer ring fixing sleeve 10 and the outer end face of the first bearing 42 to stop the first bearing 42 in the axial direction of the first bearing 42. The spacer sleeve 41 is sleeved on the inner ring fixing sleeve 20 and located between the first bearing 42 and the second bearing 40, so as to isolate the first bearing 42 and the second bearing 40.

[0044] In some embodiments, the outer ring fixing sleeve 10 is provided with a through hole extending in the circumferential direction, the spacer sleeve 41 is provided with a through hole, the through hole of the spacer sleeve 41 corresponds to the through hole of the outer ring fixing sleeve 10, and corresponds to the mounting hole 22 of the inner ring fixing sleeve 20, so that the force arm rod 33 can be connected to the mounting hole 22 of the inner ring fixing sleeve 20 through the through holes of the outer ring fixing sleeve 10 and the spacer sleeve 41 in sequence. When the rotor rotates in the radial foil gas bearing in the inner ring fixing sleeve 20, the gas film between the rotor and the foil air bearing drives the inner ring fixing sleeve 20 to rotate, and the inner ring fixing sleeve 20 drags the force arm rod 33, so that the rotating torque of the inner ring fixing sleeve 20 can be detected by the force sensor on the force arm rod 33.

[0045] The following detailed description describes the working process of the radial test device of the radial foil gas bearing.

[0046] First, the rotor capable of high-speed rotation is installed in the radial foil gas bearing in the inner ring fixing sleeve 20. In the low-speed rotation stage of the rotor, the rotor is in contact with the radial foil gas bearing; when the rotor reaches the take-off speed of the bearing, the rotor is out of contact with the radial foil gas bearing.

[0047] In the static performance test, the radial test device is connected with the force sensor and tested through the rope 121 connected with the lifting ring 12.

[0048] In the dynamic performance test, the exciter is installed on the reserved hole position on both sides of the outer ring fixing sleeve 10, and the exciter emits excitation forces of different frequencies and different sizes to the radial foil gas bearing.

[0049] During the excitation of the exciter, the displacement sensor 30 measures the horizontal and vertical displacement of the rotor, i.e. the radial displacement, and the change in the gas film of the radial foil gas bearing can be measured. The acceleration sensor 32 can record the overall acceleration. When the force arm 33 is connected to the force sensor, the force sensor can measure the torque of the radial foil gas bearing due to the frictional force of the rotor or the gas film.

[0050] The various sensors of the sensor module can be connected to an amplifier, and the measured data can be introduced into a computer for processing to obtain a series of static and dynamic performance of the bearing.

[0051] In summary, the radial test device of the radial foil gas bearing described above inserts the rotor into the inner ring fixing sleeve 20, so that the sensor module can detect various radial data of the radial foil gas bearing during high-speed rotation of the rotor, and the radial performance test of the foil gas bearing is realized.

[0052] In the several embodiments provided in the present disclosure, it is apparent that the present disclosure is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present disclosure. Therefore, the embodiments should be considered as exemplary and non-limiting, and the scope of the present disclosure is defined by the appended claims rather than the above description, and it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims. In addition, it is clear that the word "comprise" does not exclude other units or steps, and the singular does not exclude the plural. The words "first", "second" and the like are used to indicate names and not to indicate any particular order.

[0053] The above embodiments are only used to illustrate the technical solutions of the present disclosure and not limit the present disclosure. Although the present disclosure has been described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present disclosure can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure.

Claims

1. A radial test apparatus for a radial foil gas bearing, characterized by, The application relates to a sensor module for a radial foil gas bearing. The sensor module comprises a fixed sleeve, a displacement sensor, a force sensor and a force arm rod. The fixed sleeve comprises an inner sleeve and an outer sleeve. The displacement sensor is arranged along the radial direction of the inner sleeve and is used to measure the radial displacement of a rotor when the rotor rotates in the radial foil gas bearing in the inner sleeve. The force sensor is connected to the fixed sleeve and is used to detect the bearing force of the fixed sleeve. The force arm rod is connected to the inner sleeve along the radial direction and is used to detect the rotational torque of the inner sleeve by the force sensor when the rotor rotates in the radial foil gas bearing in the inner sleeve. The outer sleeve houses the inner sleeve and is coaxially connected to the inner sleeve. The outer sleeve is provided with a through hole extending along the circumferential direction, and the force arm rod passes through the through hole to connect to the inner sleeve.

2. The radial foil gas bearing radial test apparatus of claim 1 wherein, When the rotor rotates in the radial foil gas bearing in the inner sleeve, the gas film between the rotor and the foil air bearing drives the inner sleeve to rotate, and the inner sleeve drags the force arm rod to detect the rotational torque of the inner sleeve by the force sensor.

3. The radial foil gas bearing radial test apparatus of claim 2, wherein, The outer side of the inner sleeve is provided with a mounting hole extending along the radial direction, and the force arm rod passes through the outer sleeve and a spacer to connect to the mounting hole.

4. The radial foil gas bearing radial test apparatus of claim 3 wherein, The sensor module further comprises a connecting plate provided with a long hole extending along the axial direction of the outer sleeve. The connecting plate is connected to the outer sleeve through the long hole by a connecting member, and the displacement sensor is connected to the connecting plate and extends along the radial direction of the outer sleeve.

5. The radial foil gas bearing radial test apparatus of claim 4 wherein, The sensor module further comprises an acceleration sensor connected to the fixed sleeve for detecting the acceleration of the fixed sleeve. The fixed sleeve further comprises a lifting ring connected to the fixed sleeve, and the force sensor is connected to the lifting ring through a connecting rope. The fixed sleeve further comprises an intermediate assembly, and the outer sleeve is coaxially connected to the inner sleeve through the intermediate assembly. The intermediate assembly comprises a first bearing, a spacer and a second bearing. The first bearing and the second bearing are sleeved between the inner sleeve and the outer sleeve, so that the inner sleeve is rotatably connected to the outer sleeve through the first bearing. The spacer is sleeved on the inner sleeve and located between the first bearing and the second bearing. The intermediate assembly further comprises a retainer ring connected between the inner end surface of the outer sleeve and the outer end surface of the first bearing to block the first bearing along the axial direction of the first bearing. The inner side of the inner sleeve is provided with a groove for mounting a wave foil, and the end is provided with a pressing piece for fixing the wave foil.

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