A method for detecting performance of a gas foil bearing

Abstract

The application provides a kind of gas foil bearing performance detection method, it is related to gas foil bearing test technical field, it aims at solving the problem that the existing detection is mostly static detection, foil bearing performance under dynamic environment cannot be effectively detected, the technical scheme adopted is, step 1, debugging equipment, step 2, install test assembly, step 3, test, step 4, adjust air pressure, step 5, comparative analysis;In the outer surface of the top foil of the traditional gas dynamic pressure foil bearing, a gas supply hole and a gas supply pipeline are welded, the bearing interior is supplied with gas through this method, the performance of the foil bearing can be changed by changing the external gas supply pressure or flow, and the control of the bearing performance is realized;Its implementation mode is similar to the realization of active control of magnetic bearing, that is, the vibration condition of shafting is monitored based on eddy current displacement sensor, the gas supply pressure and flow are controlled using valve, and active control of shafting vibration characteristics is realized.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of gas foil bearing testing, in particular to a gas foil bearing performance detection method. BACKGROUND

[0002] A foil bearing refers to a sliding bearing for suspending a shaft by fluid dynamic pressure or static pressure by using an elastic foil. The foil bearing is a new type of bearing developed in the 1950s. A foil bearing for suspending a shaft by fluid static pressure by using a belt as an elastic foil is referred to as a foil static pressure bearing, and a foil bearing for suspending a shaft by fluid dynamic pressure is referred to as a foil dynamic pressure bearing.

[0003] The foil is fixed by a pressing plate and a locking device after being pulled tight, and three fan-shaped segments surround the shaft neck, which is equivalent to three bearing shells. When the shaft rotates, the lubricant enters the three fan-shaped segments with the shaft due to the viscous action, and a dynamic pressure lubrication film is formed, so that the foil is deformed and separated from the shaft. This principle can also be used to establish a lubrication film between the moving foil and the rigid surface (cylindrical surface, circular arc surface, plane) for guiding, so as to avoid direct contact between the foil and the guiding surface, thereby reducing friction. The foil bearing has no wear, no mechanical vibration and noise, and a long service life, and can use gas, steam or liquid as a lubricant. The foil has large elasticity, so the bearing capacity, stiffness and high-speed stability and other performances of the bearing can be controlled by appropriately controlling the deformation of the foil by pulling or bending. When calculating this type of bearing, the elastic deformation of the foil must be considered according to the elastic fluid dynamic pressure lubrication theory.

[0004] Performance testing is to test various performance indicators of a system by simulating various normal, peak and abnormal load conditions through an automated testing tool. Load testing and stress testing both belong to performance testing, and the two can be combined. Through load testing, the performance of the system under various workloads is determined, and the goal is to test the changes of various performance indicators of the system when the load gradually increases. Stress testing is to determine the bottleneck or unacceptable performance point of a system to obtain the maximum service level that the system can provide.

[0005] Rotating machinery has important applications in various fields, with the continuous growth of China's economy, the development of rotating machinery equipment also pays more and more attention to environmental impact and energy utilization efficiency. As a key component in rotating machinery equipment, bearings play a crucial role in the development trend of energy equipment. The commonly used bearing types include oil lubricated sliding bearing, rolling bearing, ceramic bearing, electromagnetic bearing, gas bearing, etc. Foil gas bearing, as a high-tech product in the bearing industry, has many advantages compared with traditional rolling bearings or oil lubricated sliding bearings, such as non-contact support during stable operation, minimal friction, maintenance-free, high motion precision, high speed adaptation, wide temperature range adaptation, oil-free lubrication, more compact structure, lower cost, longer life, etc. Therefore, it has absolute advantages in high-speed support, low-friction power consumption support, high-precision support and special working condition support fields, and is widely used in precision instruments, medical devices, high-speed micro power and other civilian and aerospace national defense fields, making it more obvious in the field of ultra-high-speed rotating machinery and ultra-precision instrument technology.

[0006] The Chinese patent CN202010913250.X discloses a kind of dynamic pressure radial gas bearing foil statics performance testing device and testing method, the technical scheme that adopts is, lifting workbench, cross slide, measurement system and flat foil / wave foil clamp, half combination clamp, combination clamp, the cross slide is fixed on the table top of lifting workbench, loading mechanism in measurement system is connected with lifting mechanism of lifting platform by moving pair, flat foil / wave foil clamp, half combination clamp, combination clamp reaches testing position after by with the positioning block of cross slide bolt connection limit, the technical scheme in above is to the performance detection of the stress size of foil in foil bearing, the detection of foil bearing is static detection, cannot effectively detect the performance of foil bearing in dynamic environment. SUMMARY

[0007] In view of the problems existing in the prior art, the present application discloses a kind of gas foil bearing performance detection device, the technical scheme that adopts is, including gas compressor, industrial computer and test component, the test component is connected with the gas compressor by gas pipe, the gas pipe is also equipped with valve, the test component, the valve and the gas compressor are connected with the industrial computer, the signal amplifier is also equipped between the industrial computer and the test component, the gas hole is opened and the gas pipeline is welded on the outer surface of the top foil of conventional gas dynamic pressure foil bearing, the bearing interior is supplied with gas by this method, the performance of foil bearing can be changed by changing external gas pressure or flow, and then the control of bearing performance is realized.

[0008] As a preferred technical scheme of the present application, the test assembly comprises a base, a motor and a mounting seat, the base is provided with the motor and the mounting seat, the mounting seat is a hollow shell, a through hole penetrating left and right is formed in the mounting seat, a rotating shaft is arranged in the through hole, the rotating shaft is connected with the output end of the motor, a bearing sleeve is further arranged in the mounting seat, the bearing sleeve is sleeved on the rotating shaft, a wave foil and a top foil are further arranged between the bearing sleeve and the rotating shaft, a via hole for the gas pipe to pass through is formed in the bearing sleeve, the wave foil and the top foil, a displacement sensor is further arranged on the base, and the displacement sensor corresponds to the position of the rotating shaft.

[0009] As a preferred technical scheme of the present application, the base is further provided with a motor seat, and the motor is mounted on the motor seat.

[0010] As a preferred technical scheme of the present application, the motor seat and the mounting seat are mounted on the base through bolts and nuts.

[0011] As a preferred technical scheme of the present application, a plurality of through grooves are formed in the base, the width dimension of the through grooves is greater than the neck of the bolt and smaller than the diameter of the nut.

[0012] As a preferred technical scheme of the present application, the displacement sensor adopts an eddy current displacement sensor.

[0013] As a preferred technical scheme of the present application, the industrial computer comprises a PLC control box and a touch screen, and the implementation manner is similar to the implementation of the active control of the magnetic bearing, that is, the vibration condition of the shafting is monitored based on the eddy current displacement sensor, the gas supply pressure and flow are controlled by using a valve, and the active control of the vibration characteristics of the shafting is realized through a control algorithm (such as PID or other algorithms).

[0014] As a preferred technical scheme of the present application, the valve adopts an SMC gas control valve, and under the premise of high-speed rotation of the rotating shaft, the gas film stiffness of the foil bearing is changed, so as to detect the carrying capacity and stability of the foil bearing during high-speed operation.

[0015] A gas foil bearing performance detection method, comprising the following steps:

[0016] Step 1, debugging the equipment, connecting the device to the power supply, powering on each electrical device, checking whether it can work normally under the condition of power on, and detecting whether the gas pipe connection is firm;

[0017] Step 2, installing the test assembly, installing the rotating shaft on the output shaft of the motor through the shaft coupling, passing the rotating shaft through the through hole of the mounting seat, and fixing and installing the motor seat and the mounting seat on the base through bolts and nuts;

[0018] Step 3, test, through the industrial computer control motor work rotation, when the motor drives the rotating shaft to a certain speed, the displacement sensor is used to detect the displacement of the rotating shaft, the performance of the gas foil bearing is detected, and the record is made;

[0019] Step 4, adjust the air pressure, control the gas compressor to work, and open the valve, pass high pressure air into the rotating shaft through the air pipe, so as to change the air pressure at the rotating shaft, and detect the stability of the rotating shaft through the displacement sensor, so as to realize the control of the performance of the gas foil bearing, and make a record;

[0020] Step 5, comparative analysis, by changing the air pressure at the rotating shaft and the data record analysis of the displacement sensor, the stability performance of the rotating shaft in high speed rotation is detected, and the performance of the gas foil bearing under different air pressure is obtained.

[0021] The beneficial effects of the present application are: the present application opens the gas supply hole on the outer surface of the top foil of the traditional gas dynamic pressure foil bearing and welds the gas supply pipeline, the bearing interior is supplied with gas through this method, the performance of the foil bearing can be changed by changing the external gas supply pressure or flow, and then the control of the performance of the bearing is realized; the realization mode is similar to the realization of active control of magnetic bearing, that is, the vibration condition of the shaft system is monitored based on the eddy current displacement sensor, the valve is used to control the gas supply pressure and flow, and the active control of the vibration characteristics of the shaft system is realized through the control algorithm (such as PID or other algorithm).

[0022] Further, under the premise of high speed rotation of the rotating shaft, the gas film stiffness of the foil bearing is changed, so as to detect the carrying capacity and stability of the foil bearing in high speed operation. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the specific embodiments or prior art description will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual proportion.

[0024] Figure 1 It is a method flowchart of the present application;

[0025] Figure 2 It is a test assembly structure schematic diagram of the present application;

[0026] Figure 3 It is a side view of the mounting seat of the present application;

[0027] Figure 4 It is an enlarged view of the local structure of the present application;

[0028] Figure 5The base is shown in a top view.

[0029] In the figure: 1, gas compressor; 2, industrial computer; 3, valve; 4, signal amplifier; 5, test assembly; 6, base; 7, motor base; 8, mounting seat; 9, motor; 10, rotating shaft; 11, bearing sleeve; 12, top foil; 13, wave foil; 14, nut; 15, through slot; 16, displacement sensor; 17, bolt; 18, air pipe. DETAILED DESCRIPTION

[0030] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying the importance of the opposite.

[0031] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] Example 1

[0033] As Figures 1 to 5As shown, the present application discloses a kind of gas foil bearing performance detection device, the technical scheme is, to detect the stability of foil bearing under high speed, including gas compressor 1, industrial computer 2 and test assembly 5, the test assembly 5 is connected with the gas compressor 1 by gas pipe 18, the valve 3 is further equipped on the gas pipe 18, the valve 3 adopts SMC gas control valve, the test assembly 5, the valve 3 and the gas compressor 1 are connected with the industrial computer 2, the industrial computer 2 includes PLC control box and touch screen, the test assembly 5 includes base 6, motor 9 and mounting seat 8, the base 6 is equipped with the motor 9 and mounting seat 8, the mounting seat 8 is the shell with hollow inside, the through-hole that is opened in the mounting seat 8 penetrates left and right, the shaft 10 is equipped in the through-hole, the shaft 10 is connected with the output end of the motor 9, bearing sleeve 11 is further equipped in the mounting seat 8, the bearing sleeve 11 is equipped on the shaft 10, wave foil 13 and top foil 12 are further equipped between the bearing sleeve 11 and the shaft 10, the bearing sleeve 11, the wave foil 13 and the top foil 12 are opened and are equipped with the via hole for the gas pipe 18 to pass through, the base 6 is further equipped with displacement sensor 16, the displacement sensor 16 adopts eddy current displacement sensor, the displacement sensor 16 is position corresponding with the shaft 10, pass through gas compressor 1 and gas pipe 18, high pressure air is passed into foil bearing, so that its stability is detected under the condition of high speed operation.

[0034] In order to make the detection result more obvious, the signal amplifier 4 is further arranged between the industrial computer 2 and the test assembly 5.

[0035] As a preferred technical scheme of the present application, in order to make the motor 9 more stable during work, avoid the vibration generated when the motor 9 works, and affect the stability performance detection of the foil bearing, the motor seat 7 is further arranged on the base 6, and the motor 9 is installed on the motor seat 7.

[0036] As a preferred technical scheme of the present application, in order to facilitate the installation of the shaft 10 and the installation detection of different specifications and sizes of the shaft 10, the motor seat 7 and the mounting seat 8 are installed on the base 6 through the bolts 17 and the nuts 14, a plurality of through grooves 15 are opened on the base 6, the width size of the through grooves 15 is greater than the neck of the bolts 17, and less than the diameter of the nuts 14.

[0037] A kind of gas foil bearing performance detection method, comprising the following steps:

[0038] Step 1, debugging equipment, connect the device to electricity, power on each electrical device, see whether it can work normally under the condition of power on, and detect whether the gas pipe 18 connection is firm;

[0039] Step 2, install the test assembly, install the rotating shaft 10 on the output shaft of the motor 9 through the shaft coupling, and pass the rotating shaft 10 through the through hole on the mounting seat 8, and fix and install the motor seat 7 and the mounting seat 8 on the base 5 through the bolts 17 and the nuts 14;

[0040] Step 3, test, control the motor 9 to work and rotate through the industrial computer 2, when the motor 9 drives the rotating shaft 10 to stabilize at a certain rotating speed, detect the displacement of the rotating shaft 10 through the displacement sensor 16, detect the performance of the gas foil bearing, and make a record;

[0041] Step 4, adjust the gas pressure, control the gas compressor 1 to work, open the valve 3, and pass high-pressure air into the rotating shaft 10 through the air pipe 18, so as to change the gas pressure at the rotating shaft 10, and detect the stability of the rotating shaft 10 through the displacement sensor 16, so as to realize the control of the performance of the gas foil bearing, and make a record;

[0042] Step 5, comparative analysis, by changing the gas pressure at the rotating shaft 10 and the data record analysis of the displacement sensor 16, the stability performance of the rotating shaft 10 at high speed is detected, and the performance of the gas foil bearing under different gas pressures is obtained.

[0043] The working principle of the present application is that the device is connected to the power supply, the power supply of the gas compressor 1, the industrial computer 2, the valve 3, the signal amplifier 4, the motor 9 and the displacement sensor 16 is debugged, whether they can work normally under the condition of power supply, and whether the connection of the air pipe 18 is firm; the rotating shaft 10 is installed on the output shaft of the motor 9 through the shaft coupling, and the rotating shaft 10 is passed through the through hole on the mounting seat 8, and the motor seat 7 and the mounting seat 8 are fixed and installed on the base 5 through the bolts 17 and the nuts 14; the motor 9 is controlled to work and rotate through the PLC controller of the industrial computer 2, when the motor 9 drives the rotating shaft 10 to stabilize at a certain rotating speed, the displacement of the rotating shaft 10 is detected through the displacement sensor 16, the performance of the gas foil bearing is detected, and a record is made; the data of the comparison foil bearing under the normal gas pressure is recorded; the gas compressor 1 is controlled to work, and the valve 3 is opened, high-pressure air is passed into the rotating shaft 10 through the air pipe 18, so as to change the gas pressure at the rotating shaft 10, and the stability of the rotating shaft 10 is detected through the displacement sensor 16, so as to realize the control of the performance of the gas foil bearing, and make a record; the experimental data of the change of the gas pressure at the rotating shaft 10 is compared with the comparison data, and the stability performance of the foil bearing is analyzed.

[0044] The circuit connection related to the present application is a common means adopted by those skilled in the art, and technical inspiration can be obtained through a limited number of tests, which belongs to the public knowledge.

[0045] The present application can be more easily understood and further advantages and benefits will become more apparent upon consideration of the following detailed description and the accompanying drawings, in which:

[0046] The term "comprising," as used herein, is intended to mean "including, but not limited to." The term "comprising" is used herein to mean the inclusion, without limitation, of the specified steps or components or subsequences thereof, or any additional steps or components or subsequences thereof. It is intended that additional steps or components or subsequences that are not specifically defined herein are alternative examples of materials, steps or components or subsequences that are encompassed by the present application.

[0047] The transitional term "consisting of limits the claim to the specified materials, steps or components. The transitional phrase "consisting essentially of limits the claim to the specified materials, steps or components with the possibility of unrecited materials, steps or components being present so long as they do not materially change the base characteristic of the claim. The transitional phrase "consisting of" excludes any unrecited material, step or component. If used in the claims, this phrase will close the claims to the inclusion of any material not specified. The phrase "consisting of" is used only to limit the claim to the specified materials, steps or components and does not exclude additional unspecified materials, steps or components which are associated with the specified materials, steps or components. The transitional phrase "consisting of" is used only to limit the claim to the specified materials, steps or components and does not exclude additional unspecified materials, steps or components which are associated with the specified materials, steps or components.

[0048] Components not specifically described herein are of conventional design.

[0049] Although the foregoing application has been described in some detail for the purposes of clarity and example, it is to be understood that certain changes and modifications can be practiced within the scope of the appended claims. Accordingly, the application is not to be restricted to the precise details of experimentation set forth herein, but rather to be accorded the broadest scope of the claims.

Claims

1. A kind of gas foil bearing performance detection device, including gas compressor (1), industrial computer (2) and test assembly (5), the test assembly (5) is connected with the gas compressor (1) by gas pipe (18), the gas pipe (18) is also equipped with valve (3), it is characterized in that: The test assembly (5), the valve (3) and the gas compressor (1) are connected with the industrial computer (2), and a signal amplifier (4) is further arranged between the industrial computer (2) and the test assembly (5); the test assembly (5) comprises a base (6), a motor (9) and a mounting seat (8), the motor (9) and the mounting seat (8) are arranged on the base (6), the mounting seat (8) is a hollow shell, a through hole penetrating left and right is formed in the mounting seat (8), a rotating shaft (10) is arranged in the through hole, the rotating shaft (10) is connected with the output end of the motor (9), a bearing sleeve (11) is further arranged in the mounting seat (8), the bearing sleeve (11) is sleeved on the rotating shaft (10), a wave foil (13) and a top foil (12) are further arranged between the bearing sleeve (11) and the rotating shaft (10), a through hole is formed in the bearing sleeve (11), the wave foil (13) and the top foil (12) for the gas pipe (18) to pass through, the gas pipe (18) is welded to the gas hole formed in the outer surface of the top foil (12), a displacement sensor (16) is further arranged on the base (6), and the displacement sensor (16) corresponds to the position of the rotating shaft (10).

2. The gas foil bearing performance detection device of claim 1, wherein: A motor seat (7) is further arranged on the base (6), and the motor (9) is arranged on the motor seat (7).

3. The gas foil bearing performance testing apparatus of claim 2, wherein: The motor seat (7) and the mounting seat (8) are arranged on the base (6) through bolts (17) and nuts (14).

4. The gas foil bearing performance detection device of claim 3, wherein: A plurality of through grooves (15) are formed in the base (6), the width of the through grooves (15) is greater than the neck of the bolt (17) and smaller than the diameter of the nut (14).

5. The gas foil bearing performance testing device of claim 1, wherein: The displacement sensor (16) is an eddy current displacement sensor.

6. The gas foil bearing performance detection device of claim 1, wherein: The industrial computer (2) comprises a PLC control box and a touch screen.

7. The gas foil bearing performance testing device of claim 1, wherein: The valve (3) is an SMC gas control valve.

8. A gas foil bearing performance testing method for a gas foil bearing performance testing apparatus according to claim 1, characterized by, The method comprises the following steps: Step 1, debugging the equipment, connecting the device to the power supply, and debugging each electrical device to see whether it can work normally under the condition of being connected to the power supply, and detecting whether the gas pipe (18) connection is firm; Step 2, installing the test assembly, installing the rotating shaft (10) on the output shaft of the motor (9) through a shaft coupling, and passing the rotating shaft (10) through the through hole of the mounting seat (8), and fixing and installing the motor seat (7) and the mounting seat (8) on the base (6) through the bolts (17) and the nuts (14); Step 3, testing, controlling the motor (9) to work through the industrial computer (2), when the motor (9) drives the rotating shaft (10) to a certain rotating speed, detecting the displacement of the rotating shaft (10) through the displacement sensor (16) to detect the performance of the gas foil bearing, and making a record; Step 4, adjusting the gas pressure, controlling the gas compressor (1) to work, and opening the valve (3), passing high-pressure air into the gas film layer through the gas pipe (18) welded to the gas hole of the top foil, changing the gas pressure of the rotating shaft (10), detecting the stability of the rotating shaft through the displacement sensor (16), and then controlling the performance of the gas foil bearing, and making a record. Step 5, comparative analysis, by changing the air pressure at the shaft (10) size, and displacement sensor (16) data record analysis, to detect the shaft (10) in high speed rotation stability performance, under different gas pressure, gas foil bearing performance.

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