Performance test bench for air suspension bearing of air suspension centrifugal compressor

Abstract

The invention provides an air floating centrifugal compressor air suspension bearing performance test bench, which comprises a first driving part, a second driving part and a third driving part, and is characterized in that a thrust disc is arranged on the first driving part, and the first driving part is used for driving the thrust disc to rotate; the bearing fixing seat is arranged on one side of the thrust disc, an air suspension bearing is arranged on the bearing fixing seat, the air suspension bearing is located between the thrust disc and the bearing fixing seat, and the axis of the thrust disc is the same as that of the bearing fixing seat; the beneficial effects of the invention are that through the arrangement of the pressurization assembly, the first driving member, the thrust disc, the bearing fixing seat and the displacement detection member, the axial force of the air suspension bearing and the corresponding air film thickness can be detected under the condition of high-speed operation, and the comprehensive test of the performance of the air suspension thrust bearing can be completed; and powerful technical support is provided for development and application of an air suspension bearing technology.

Description

Technical Field

[0001] This application belongs to the technical field of compressors, and particularly relates to a performance test bench for air suspension bearings of an air floating centrifugal compressor. Background Art

[0002] An air suspension bearing, also known as an air bearing or air floating bearing, is a technology that uses compressed air or gas to form an extremely thin air film between the shaft and the bearing housing, thereby achieving non-contact support and rotation. When this bearing system is operating, there is no direct contact between the shaft and the bearing housing, so it can significantly reduce friction and wear, and improve the operating efficiency and lifespan of the equipment. Air suspension bearings have significant advantages in application scenarios with high precision, high speed, and low friction, and are widely used in fields such as precision machinery, aerospace, semiconductor manufacturing, and medical equipment.

[0003] An air floating bearing forms a high-pressure air film between the shaft and the bearing housing to generate sufficient buoyancy to support the rotating shaft. When the shaft starts to rotate, the rotational movement of the shaft will cause the formation of the air film. As the rotational speed increases, the thickness of the air film also increases, thereby providing a stable supporting force.

[0004] The measurement of the axial force of an air floating bearing is an important part of evaluating its performance and stability. Since the shaft and the bearing housing of an air floating bearing are in non-contact support through a thin air film during operation, it is difficult to directly measure the axial force and the air film thickness in relative situations. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0006] To solve the above problems, this application provides a performance test bench for air suspension bearings of an air floating centrifugal compressor, including:

[0007] A first driving member, on which a thrust disk is provided, and the first driving member is used to drive the thrust disk to rotate;

[0008] A bearing fixing seat, which is arranged on one side of the thrust disk. An air suspension bearing is provided on the bearing fixing seat, and the air suspension bearing is located between the thrust disk and the bearing fixing seat, and the axes of the thrust disk and the bearing fixing seat are the same;

[0009] A pressurizing assembly, which is arranged on the side of the bearing fixing seat away from the air suspension bearing, and the pressurizing assembly is used to push the bearing fixing seat to axially move towards the thrust disk;

[0010] A displacement detection member, which is used to detect the axial displacement of the air suspension bearing after pressurization.

[0011] Optionally, a plurality of air inlet holes are provided on the bearing fixing seat.

[0012] Optionally, the pressurizing assembly includes:

[0013] A connecting rod, the first end of the connecting rod is connected to the side of the bearing fixing seat away from the air suspension bearing;

[0014] A second driving member, the output end of the second driving member is connected to the second end of the connecting rod.

[0015] Optionally, the pressurizing assembly further includes a linear bearing, and the connecting rod is arranged in the linear bearing.

[0016] Optionally, the second driving member is a cylinder.

[0017] Optionally, the displacement detecting member is arranged between the output end of the second driving member and the second end of the connecting rod.

[0018] Optionally, the displacement detecting member is a displacement sensor.

[0019] Optionally, a support platform is arranged at the bottom of the pressurizing assembly.

[0020] Optionally, the first driving member includes:

[0021] A high-speed supercharger, the output shaft of the high-speed supercharger is connected to the thrust disc;

[0022] A driving motor, the driving motor is connected to the input shaft of the high-speed supercharger.

[0023] Optionally, a transmission member is arranged between the driving motor and the input shaft of the high-speed supercharger.

[0024] Advantageous Effects

[0025] In the embodiment of the present invention, a test bench for testing the performance of an air suspension bearing of an air floating centrifugal compressor realizes the detection of the axial force and the corresponding air film thickness of the air suspension bearing under high-speed operation through the arrangement of the pressurizing assembly, the first driving member, the thrust disc, the bearing fixing seat and the displacement detecting member, completes a comprehensive test on the performance of the air floating thrust bearing, and provides strong technical support for the development and application of the air suspension bearing technology. Description of the Drawings

[0026] Figure 1 It is a first perspective structure diagram of the test bench for testing the performance of the air suspension bearing of the air floating centrifugal compressor of the present invention;

[0027] Figure 2 It is a connection structure diagram of the thrust disc and the bearing fixing seat of the test bench for testing the performance of the air suspension bearing of the air floating centrifugal compressor of the present invention.

[0028] The reference numerals are shown as follows:

[0029] 1. First driving member; 11. High-speed supercharger; 12. Transmission member; 2. Thrust disk; 3. Bearing fixing seat; 4. Air suspension bearing; 5. Pressurizing assembly; 51. Connecting rod; 52. Second driving member; 53. Linear bearing; 6. Displacement detecting member; 7. Air inlet hole; 8. Support platform. Detailed implementation manners

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0032] In the present application, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The following describes the preferred embodiments of the present invention with reference to the drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not used to limit the present invention.

[0034] Referring to Figure 1-2 As shown, according to an embodiment of the present application, a performance test bench for an air suspension bearing of an air-floating centrifugal compressor is provided, including:

[0035] A first driving member 1, on which a thrust disk 2 is arranged, and the first driving member 1 is used to drive the thrust disk 2 to rotate;

[0036] A bearing fixing seat 3 is arranged on one side of the thrust disc 2. An air suspension bearing 4 is arranged on the bearing fixing seat 3. The air suspension bearing 4 is located between the thrust disc 2 and the bearing fixing seat 3. The axes of the thrust disc 2 and the bearing fixing seat 3 are the same.

[0037] A pressurizing assembly 5 is arranged on the side of the bearing fixing seat 3 away from the air suspension bearing 4. The pressurizing assembly 5 is used to push the bearing fixing seat 3 to axially move towards the thrust disc 2.

[0038] A displacement detection component 6 is used to detect the axial displacement of the air suspension bearing 4 after pressurization.

[0039] Specifically, the first driving part 1 serves as a power source and can accurately output the required rotational speed and torque. The thrust disc 2 is connected to the first driving part 1. The thrust disc 2 is a disc-shaped structure made of metal, and its surface has been finely processed and balanced to ensure that no excessive vibration and eccentricity occur during high-speed rotation, thus providing a stable rotational basis for the subsequent performance test of the air suspension bearing 4.

[0040] The bearing fixing seat 3 is installed on one side of the thrust disc 2. It is made of a strong and stable material, such as cast iron or high-strength aluminum alloy, and its structure meets the installation and positioning requirements of the air suspension bearing 4. The air suspension bearing 4 arranged on the bearing fixing seat 3 is located between the thrust disc 2 and the bearing fixing seat 3, and the axes of the three are the same. The air suspension bearing 4 can form a stable and uniform high-pressure air film with the thrust disc 2 to achieve non-contact support and rotation, reduce friction and wear, and improve the accuracy and reliability of the test.

[0041] The pressurizing assembly 5 is arranged on the side of the bearing fixing seat 3 away from the air suspension bearing 4. It can adopt a combination of a cylinder and a pressure control system. The cylinder is selected as a high-strength and high-precision product, which can provide sufficient thrust and the magnitude of the thrust can be accurately controlled. The pressure control system adjusts the intake pressure and exhaust pressure of the cylinder to achieve precise adjustment of the cylinder thrust, thereby pushing the bearing fixing seat 3 to axially move towards the thrust disc 2 and providing the working state of the air suspension bearing 4 under different axial forces to comprehensively test its performance.

[0042] The displacement detection component 6 is used to detect the axial displacement of the air suspension bearing 4 after pressurization. A high-precision displacement sensor can be used, such as a laser displacement sensor or an inductive displacement sensor. The displacement detection component 6 can accurately measure the displacement changes of the air suspension bearing 4 under different axial forces. By combining with other measurement data, such as cylinder pressure data, key performance parameters such as axial thrust and air film thickness can be calculated. During the test, first adjust the bearing fixing seat 3 to a suitable position, record the distance between the air suspension bearing 4 and the thrust disk 2 and the reading of the displacement sensor at this time, ensure that the cylinder pressure is consistent with the atmospheric pressure, and record the initial distance as L. Then start the first driving component 1 to drive the thrust disk 2 to gradually rise to the experimental speed. After the operation is stable, apply a pressure towards the thrust disk 2 direction to the air suspension bearing 4 through the pressurization component 5. After the pressure is stable, detect the displacement amount under the corresponding pressure through the displacement detection component 6 and obtain the corresponding displacement amount. Record the displacement amount as Δ L. Then the distance between the air suspension bearing 4 and the thrust disk 2 under the corresponding axial force can be obtained as L0 = L - ΔL. And at this time, the axial thrust F = p * A (where p is the cylinder pressure and A is the pressure acting area inside the cylinder). The cylinder pressure can be read through a cylinder pressure gauge, and the pressure acting area inside the cylinder will be marked when the cylinder leaves the factory. Repeat the above steps and record multiple groups of values to complete a comprehensive test of the performance of the air floating thrust bearing 4, providing strong technical support for the development and application of the air suspension bearing 4 technology.

[0043] A number of air intake holes 7 are provided on the bearing fixing seat 3.

[0044] Specifically, for the number of air intake holes 7 provided on the bearing fixing seat 3, the air intake holes 7 are processed by a precision drilling process. The aperture size is set according to the air supply requirements of the air suspension bearing 4 and the overall parameters of the test bench to ensure that compressed air with appropriate flow and pressure can be provided. The number of air intake holes 7 is reasonably determined according to the size, shape of the bearing fixing seat 3 and the distribution of the air suspension bearing 4, and can be evenly distributed or arranged on the bearing fixing seat 3 according to a specific layout method to ensure that the compressed air can be evenly supplied to each part of the air suspension bearing 4 to form a stable and uniform high-pressure air film.

[0045] The inner wall of the air inlet hole 7 is specially treated, such as polished or coated with wear-resistant and corrosion-resistant coatings, to reduce the resistance and friction of air during the flow process, prevent the unstable air flow or impurity accumulation caused by the rough inner wall, so as to ensure the continuity and stability of air supply. During the operation of the test bench, compressed air enters the gap between the air suspension bearing 4 and the thrust disk 2 through the air inlet hole 7. With the rotational movement of the thrust disk 2, a high-pressure air film is formed between the air suspension bearing 4 and the thrust disk 2 to achieve non-contact support and rotation. The air inlet hole 7 provides good air supply conditions for the air suspension bearing 4 to ensure its stable operation during the test, accurately simulate the actual working scenario, and improve the reliability and accuracy of the test results.

[0046] The pressurizing assembly 5 includes:

[0047] A connecting rod 51, the first end of the connecting rod 51 is connected to the side of the bearing fixing seat 3 away from the air suspension bearing 4;

[0048] A second driving member 52, the output end of the second driving member 52 is connected to the second end of the connecting rod 51.

[0049] Specifically, the connecting rod 51 is connected between the second driving member 52 and the bearing fixing seat 3. The connecting rod 51 is made of high-strength and low-deformation metal materials, such as alloy steel or stainless steel, and its shape can be cylindrical or square. The first end of the connecting rod 51 and the side of the bearing fixing seat 3 away from the air suspension bearing 4 adopt reliable connection methods, such as threaded connection, pin connection or welding, to ensure that it will not loosen or disengage under the action of axial force, so as to stably transmit the thrust output by the second driving member 52.

[0050] As the power output, the second driving member 52 can select high-precision electric cylinders, hydraulic cylinders or pneumatic cylinders and other devices, which have good thrust control accuracy and response speed. The output end of the second driving member 52 is connected to the second end of the connecting rod 51, and the connection method is tight and firm. For example, for an electric cylinder, a coupling connection can be used, and for a hydraulic cylinder or a pneumatic cylinder, a threaded connection or a special connection joint can be used to ensure that the power can be efficiently transmitted to the connecting rod 51 during the working process. During the test, by controlling the output parameters of the second driving member 52, such as the current of the electric cylinder, the oil pressure of the hydraulic cylinder or the air pressure of the pneumatic cylinder, the magnitude of the axial thrust exerted by the connecting rod 51 on the bearing fixing seat 3 can be accurately adjusted, so as to simulate the axial force borne by the air suspension bearing 4 under different working conditions. This precisely controllable pressurizing method enables the device to comprehensively and carefully test the performance of the air suspension bearing 4 under the action of various axial forces, including the change of the bearing clearance, the stability of the air film and the bearing capacity of the bearing, etc., providing strong support for the research and development, optimization and quality inspection of the air suspension bearing 4.

[0051] The pressurizing assembly 5 further includes a linear bearing 53 , and the connecting rod 51 is disposed in the linear bearing 53 .

[0052] The second driving member 52 is a cylinder.

[0053] Specifically, the linear bearing 53 adopts a high-precision ball linear bearing 53 or a roller linear bearing 53, and the rolling element and the guide rail inside it have a very small friction coefficient, which can provide a smooth and precise linear motion guide for the connecting rod 51. The mounting seat of the linear bearing 53 is firmly fixed on the frame structure of the test bench to ensure that it will not be displaced or deformed when subjected to axial force. The connecting rod 51 is arranged in the linear bearing 53, and the matching accuracy between the two is extremely high, and the gap is controlled in a very small range, which can not only ensure that the connecting rod 51 can move axially freely in the linear bearing 53, but also effectively limit its radial shaking, so that the connecting rod 51 driven by the cylinder can stably and accurately transmit the axial force to the bearing fixing seat 3, avoiding the influence of the test result of the air suspension bearing 4 due to the force transmission deviation.

[0054] The second driving member 52 is a cylinder with a simple structure and reliable operation. It can quickly respond to control signals and output a large axial thrust. During the test, the stroke and output thrust of the piston are accurately controlled by adjusting the intake pressure and exhaust pressure of the cylinder and utilizing the compressibility of the gas. For example, when it is necessary to increase the axial thrust of the air suspension bearing 4, the intake pressure of the cylinder is increased so that the piston pushes the connecting rod 51 outward, thereby pushing the bearing fixing seat 3 closer to the thrust plate 2; conversely, reducing the intake pressure or increasing the exhaust pressure can reduce the axial thrust. This cylinder-based pressurization method enables the test bench to flexibly adjust the axial force within a large range to meet the testing requirements of air suspension bearings 4 with different specifications and performance requirements.

[0055] The displacement detecting member 6 is disposed between the output end of the second driving member 52 and the second end of the connecting rod 51 .

[0056] The displacement detection member 6 is a displacement sensor.

[0057] Specifically, the displacement sensor is used as the displacement detection member 6, which is arranged between the output end of the second driving member 52 and the second end of the connecting rod 51. The displacement sensor adopts a high-precision linear displacement sensor, such as a laser displacement sensor or an inductive displacement sensor, which has extremely small measurement error and high resolution, and can accurately detect the slight displacement change of the connecting rod 51 in the axial direction. The displacement sensor is firmly installed in the corresponding position through a special mounting bracket or a fixing fixture to ensure that its measurement axis is completely coincident with the axial movement direction of the connecting rod 51 to avoid measurement errors caused by installation deviations.

[0058] During the test, when the second driving member 52 pushes the connecting rod 51, thereby causing the bearing fixing seat 3 to move axially, the displacement sensor can capture the displacement data of the connecting rod 51 in real time. Since the movement of the bearing fixing seat 3 is directly related to the axial displacement of the air suspension bearing 4, the axial displacement of the air suspension bearing 4 under different axial forces can be accurately calculated by analyzing and processing the data collected by the displacement sensor. For example, the initial measurement value of the displacement sensor is set to zero, and as the cylinder pushes the connecting rod 51, the displacement change value detected by the displacement sensor is the actual axial displacement value of the bearing fixing seat 3 and the air suspension bearing 4. Combined with other measurement parameters, such as cylinder pressure, etc., important performance indicators such as the change in the air film thickness of the air suspension bearing 4 and the stiffness characteristics of the bearing can be further inferred. This precise displacement detection method provides reliable data support for a comprehensive and in-depth study of the performance of the air suspension bearing 4, so that the working state and performance of the air suspension bearing 4 can be more accurately evaluated, and the requirements for displacement measurement accuracy and reliability of the performance test of the air suspension bearing 4 are met.

[0059] A support platform 8 is disposed at the bottom of the pressurizing component 5 .

[0060] Specifically, the support platform 8 is made of solid and heavy materials, such as cast iron or reinforced concrete, and has sufficient strength and rigidity to withstand various forces generated by the pressurized component 5 during operation, including axial thrust, equipment deadweight, and dynamic loads generated by movement, etc. The support platform 8 can be in the shape of a cuboid, a cube, or other geometric shapes with good stability. The bottom of the support platform 8 is usually equipped with shock-absorbing pads or anchor bolts. The shock-absorbing pads can effectively reduce the transmission of vibrations generated by the operation of the equipment to the ground, avoiding interference with the surrounding environment of the test bench. The anchor bolts can firmly fix the support platform 8 on the ground to prevent the support platform 8 from displacement or overturning when subjected to a large axial force.

[0061] The connection between the support platform 8 and the pressurizing component 5 can be direct contact and fastened by bolts, or connected by a special connection seat to ensure that there is no relative sliding or loosening between the two during the pressurization process. During installation, the upper surface of the support platform 8 needs to be accurately leveled and processed to ensure that the verticality and horizontality of the pressurizing component 5 after installation meet the requirements, so that the cylinder can smoothly push the connecting rod 51 to move axially, avoiding problems such as uneven force transmission or equipment jamming caused by installation deviation.

[0062] The first driving member 1 comprises:

[0063] A high-speed supercharger 11, wherein an output shaft of the high-speed supercharger 11 is connected to the thrust plate 2;

[0064] A driving motor is connected to an input shaft of the high-speed supercharger 11 .

[0065] A transmission member 12 is provided between the driving motor and the input shaft of the high-speed supercharger 11.

[0066] Specifically, the output shaft of the high-speed supercharger is tightly connected to the thrust disk 2, ensuring that the power input by the driving motor can be effectively amplified to meet the torque and speed requirements for the high-speed rotation of the thrust disk 2. The internal structure of the high-speed supercharger includes supercharging elements such as a high-precision gear set, an impeller or a turbine. After strict dynamic balancing and assembly debugging, the high-speed supercharger can work stably and reliably during operation, and the rotational speed fluctuation of the output shaft is extremely small, providing a stable rotation reference for the performance test of the air suspension bearing 4.

[0067] As a power source, the driving motor can accurately control the rotational speed and output power according to test requirements. The transmission member 12 provided between the driving motor and the input shaft of the high-speed supercharger can adopt belt pulley drive, chain drive or gear drive, etc.

[0068] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only the preferred implementation manner of the present application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present application, several improvements and variations can still be made, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A test bench for air bearing performance testing of air-floating centrifugal compressors, characterized in that: include: A first driving member (1), wherein a thrust plate (2) is disposed on the first driving member (1), and the first driving member (1) is used to drive the thrust plate (2) to rotate; A bearing fixing seat (3), the bearing fixing seat (3) being arranged on one side of the thrust plate (2), an air suspension bearing (4) being arranged on the bearing fixing seat (3), the air suspension bearing (4) being located between the thrust plate (2) and the bearing fixing seat (3), and the thrust plate (2) and the bearing fixing seat (3) having the same axis; A pressurizing component (5), the pressurizing component (5) being arranged on a side of the bearing fixing seat (3) away from the air suspension bearing (4), the pressurizing component (5) being used to push the bearing fixing seat (3) to move axially toward the thrust plate (2); A displacement detection member (6), wherein the displacement detection member (6) is used to detect the axial displacement of the pressurized air suspension bearing (4).

2. The air suspension bearing performance test bench for air-floating centrifugal compressor according to claim 1 is characterized in that: The bearing fixing seat (3) is provided with a plurality of air inlet holes (7).

3. The air suspension bearing performance test bench for air-floating centrifugal compressor according to claim 2 is characterized in that: The pressurizing assembly (5) comprises: A connecting rod (51), wherein a first end of the connecting rod (51) is connected to a side of the bearing fixing seat (3) away from the air suspension bearing (4); A second driving member (52), wherein an output end of the second driving member (52) is connected to the second end of the connecting rod (51).

4. The air suspension bearing performance test bench for air-floating centrifugal compressor according to claim 3 is characterized in that: The pressurizing assembly (5) further comprises a linear bearing (53), and the connecting rod (51) is arranged in the linear bearing (53).

5. The air suspension bearing performance test bench for air-floating centrifugal compressor according to claim 4 is characterized in that: The second driving member (52) is a cylinder.

6. The air suspension bearing performance test bench for air-floating centrifugal compressor according to claim 5 is characterized in that: The displacement detection member (6) is arranged between the output end of the second driving member (52) and the second end of the connecting rod (51).

7. The air suspension bearing performance test bench for air-floating centrifugal compressor according to claim 6 is characterized in that: The displacement detection member (6) is a displacement sensor.

8. The air suspension bearing performance test bench for air-floating centrifugal compressor according to claim 7 is characterized in that: A support platform (8) is provided at the bottom of the pressurizing component (5).

9. The air suspension bearing performance test bench for air-floating centrifugal compressor according to claim 8 is characterized in that: The first driving member (1) comprises: A high-speed supercharger (11), wherein an output shaft of the high-speed supercharger (11) is connected to the thrust plate (2); A drive motor is connected to an input shaft of the high-speed supercharger (11).

10. The air suspension bearing performance test bench for air-floating centrifugal compressor according to claim 9 is characterized in that: A transmission member (12) is provided between the driving motor and the input shaft of the high-speed supercharger (11).

Images