High speed compressor bearing-rotor tester

Abstract

The utility model belongs to compressor bearing test technical field especially relates to high -speed compressor bearing - rotor testing machine, including testing machine shell, the testing machine shell upside is opened with loading mouth, the loading mouth top fixed installation has electric jar connection guide sleeve, the upside of electric jar connection guide sleeve is fixedly installed with electric pressure cylinder, the output of electric pressure cylinder is fixedly installed with pressure sensor adapter, this high -speed compressor bearing - rotor testing machine, electric pressure cylinder output end downward motion drives pressure sensor and buffer head synchronous downward, buffer head is pressed to loading cross bar, transmits force to loading roller bearing, and loading roller bearing is installed on sliding bearing pedestal, so that the measured sliding bearing is finally transmitted to the loading force, avoids that the loading head directly exerts pressure on the measured sliding bearing, limits its degree of freedom, influences bearing friction force measurement.

Description

Technical Field

[0001] This utility model belongs to the field of compressor bearing testing technology, and particularly relates to a high-speed compressor bearing-rotor testing machine. Background Technology

[0002] In the field of high-speed compressor R&D and performance verification, the performance of its core component, the bearing, directly determines the compressor's adaptability to operating conditions and its service life. Therefore, before conducting full-machine testing of the compressor, the sliding bearing design must be verified. By simulating actual operating conditions through test units, key parameters such as oil film pressure field, temperature field, and friction torque are measured to analyze and evaluate whether the bearing performance meets design expectations, providing data support for bearing structure optimization and fault early warning.

[0003] The design of a high-speed compressor bearing-rotor testing machine presents several challenges. Traditional loading methods, such as applying pressure through direct contact between the loading head and the sliding bearing or its housing, restrict the bearing's rotational freedom, making it impossible to detect the frictional torque of the sliding bearing. Furthermore, vibration is unavoidable in dynamic testing, significantly impacting closed-loop loading and force acquisition. Finally, traditional testing machines are designed specifically for the bearing under test, limiting their versatility. Therefore, we propose an optimized high-speed compressor bearing-rotor testing machine. Utility Model Content

[0004] The purpose of this invention is to provide a high-speed compressor bearing-rotor testing machine to solve the problems mentioned in the background art.

[0005] In view of this, the present invention provides a high-speed compressor bearing-rotor testing machine, including a testing machine housing, a loading port is provided on the upper surface of the testing machine housing, an electric cylinder connecting guide sleeve is fixedly installed above the loading port, an electric pressure cylinder is fixedly installed on the upper side of the electric cylinder connecting guide sleeve, and a pressure sensor adapter is fixedly installed at the output end of the electric pressure cylinder. A pressure sensor is fixedly installed at the bottom of the rotor shaft and the pressure sensor adapter. A buffer head is fixedly installed on the lower side of the pressure sensor. A loading crossbar is provided below the buffer head. The loading crossbar is slidably installed on the outer shell of the testing machine. Two loading roller bearing seats are fixedly installed on the lower side of the loading crossbar. Two loading roller bearing bodies are fixedly installed on the inner walls of the two loading roller bearing seats. The rotor shaft is fixedly installed on the inner ring of the two loading roller bearing bodies. The loading roller bearing bodies are fixedly installed on the flange of the sliding bearing seat. The two sliding bearing seat flanges are connected to both sides of the sliding bearing seat. The sliding bearing bodies are fixedly installed on the inner wall of the sliding bearing seat.

[0006] In this technical solution, the testing machine housing is fixedly connected top and bottom by bolts to form a closed testing chamber. A loading port is opened on the surface of the upper side of the testing machine housing. An electric cylinder connecting guide sleeve is fixedly installed inside the loading port. An electric pressure cylinder, which can be a servo electric cylinder, is fixedly installed on the upper side of the electric cylinder connecting guide sleeve. The output end of the electric pressure cylinder faces downwards, and a pressure sensor adapter is fixedly installed there. A pressure sensor is fixedly installed at the bottom end of the pressure sensor adapter for real-time monitoring of the applied load and realizing pressure negative feedback closed-loop control. A buffer head is fixedly installed on the lower side of the pressure sensor. The buffer head contains a buffer spring and is composed of two upper and lower sleeves that can slide relative to each other, constraining and guiding the buffer spring. The design of the buffer head is to reduce the impact of rotor vibration and external impact on the pressure sensor and the tested sliding bearing, making it closer to the actual operating effect, reducing wear on the electric cylinder lead screw, and extending the service life of the electric cylinder. A loading crossbar is fixedly installed on the lower side of the buffer head. Two loading roller bearing seats are fixedly installed on the lower side of the loading crossbar. Two loading roller bearing housings each have a loading roller bearing fixedly mounted on them. The rotor shaft is fixedly mounted on two support bearings, which are embedded in the support bearing housings and finally fixedly mounted inside the testing machine housing. Between these two loading roller bearings, a common sliding bearing housing is fixedly mounted via two bearing housing flanges. The sliding bearing body to be tested is fixedly mounted on the inner wall of the sliding bearing housing, and the rotor shaft also passes through this sliding bearing. When a load test is required on the sliding bearing, the electric pressure cylinder is activated. The electric pressure cylinder pushes the pressure sensor adapter downwards, transmitting force to the loading crossbar through the pressure sensor and buffer head. The loading crossbar transmits the downward force to the two loading roller bearings below it. The loading roller bearings then transmit the force to the sliding bearing housings, and finally apply the force to the sliding bearing under test. The structural design of the loading roller bearings avoids the problem of the loading head directly contacting the sliding bearing housing, preventing it from rotating freely, allowing the testing machine to measure the frictional torque of the sliding bearing during operation.

[0007] In the above technical solution, further, two support roller bearing seats are fixedly installed on the inner wall of the test machine housing, and support roller bearings are fixedly installed on the inner wall of the two support roller bearing seats. The rotor shaft is fixedly installed on the two support roller bearings, and an oil seal is fixedly installed on the outer side of each of the two support roller bearings.

[0008] In this technical solution, two support roller bearing seats are fixedly installed on the inner wall of the testing machine housing near both ends; support roller bearings are fixedly installed on the two support roller bearing seats respectively, and the two ends of the rotor shaft cooperate with the two support roller bearings to provide high-speed rotation support for the rotor shaft.

[0009] In this technical solution, both sets of roller bearings and the tested sliding bearing are equipped with bearing housings. When the tested bearing is replaced, the rotor shaft and roller bearings also need to be replaced according to the changes in the size and operating conditions of the tested bearing. The replacement of these components will result in a mismatch between them and the main body of the testing machine. In this case, only new bearing housings need to be manufactured, eliminating the need to build a separate testing machine. By keeping the external dimensions of each bearing housing unchanged and changing the inner ring dimensions accordingly based on the bearing size, the testing machine can meet the testing needs of bearings of various sizes, greatly increasing its versatility.

[0010] In the above technical solution, furthermore, two threaded holes are opened on the surface of one of the test machine housings, and an eddy current displacement sensor is fixedly installed on each of the threaded holes.

[0011] In this technical solution, two threaded holes with an included angle of 90 degrees are formed on the surface of the upper testing machine housing, near the sliding bearing body. Eddy current displacement sensors are fixedly installed in both threaded holes, with the non-contact probes of the eddy current displacement sensors facing the surface of the sliding bearing housing. During machine operation, the vibration amplitude and shaft trajectory of the sliding bearing can be monitored in real time.

[0012] In the above technical solution, a lever arm is fixedly installed on the surface of the sliding bearing seat, a clearance opening is provided on the surface of the testing machine housing, one end of the lever arm extends to the outside of the testing machine housing through the clearance opening, a torque sensor is fixedly installed on the surface of the testing machine housing, and one extended end of the lever arm is located on the detection end of the torque sensor.

[0013] In this technical solution, a lever arm is fixedly installed on the surface of the sliding bearing housing. A clearance opening is provided on the surface of the testing machine housing. One end of the lever arm extends through this clearance opening to the outside of the testing machine housing. A torque sensor is fixedly installed on the outer surface of the testing machine housing. The end of the lever arm extending out of the housing rests on or connects to the detection end of the torque sensor. When the sliding bearing body rotates, it generates a frictional resistance torque. This torque acts on the sliding bearing housing, causing it to tend to rotate. This tendency is converted into a force by the lever arm and acts on the torque sensor. By measuring this force and combining it with the length of the lever arm, the torque sensor can calculate the frictional torque of the sliding bearing body.

[0014] Furthermore, in the above technical solution, end cover flanges are fixedly installed on both sides of the outer shells of the two testing machines to serve the purposes of dust prevention and aesthetics.

[0015] In this technical solution, an oil seal is installed on the inner side of the fixed end cover flange to prevent lubricating oil from leaking from the shaft end, avoid waste of lubricating oil, and keep the testing machine and the environment clean.

[0016] In the above technical solution, furthermore, a mounting bracket is fixedly installed on the lower side of one of the test machine housings.

[0017] In this technical solution, the entire testing machine is securely mounted on a stable foundation platform by installing a mounting bracket.

[0018] The beneficial effects of this utility model are: This high-speed compressor bearing-rotor testing machine uses a pressure cylinder whose output end moves downwards, driving a pressure sensor and a buffer head to move synchronously downwards via a pressure sensor adapter. The buffer head then drives a loading crossbar to apply a load, which is transferred to the loading roller bearing, which in turn transfers the load to the sliding bearing under test. This method simulates the load while avoiding the problem of the loading head directly contacting the sliding bearing housing and preventing it from rotating freely. This allows the testing machine to measure the frictional torque of the sliding bearing during operation.

[0019] This high-speed compressor bearing-rotor testing machine, through the design of a buffer head, reduces the impact of rotor vibration and external impact on the pressure sensor and the tested sliding bearing, making it closer to the actual operating effect, and also reducing wear on the electric cylinder lead screw, thus extending the service life of the electric cylinder.

[0020] This high-speed compressor bearing-rotor testing machine uses two sets of roller bearings and bearing housings for the tested sliding bearings. When the tested bearing is replaced, there is no need to replace the rotor shaft or roller bearings; only a new bearing housing needs to be manufactured, eliminating the need to build a separate testing machine. The external dimensions of each bearing housing remain unchanged, while the inner ring dimensions change accordingly based on the bearing dimensions. This allows the testing machine to meet the testing needs of bearings of various sizes, greatly increasing its versatility. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 In this utility model Figure 2 A magnified schematic diagram of the structure of region A; Figure 4 This is a schematic diagram of the eddy current displacement sensor, lever arm, and related structures in this utility model.

[0022] The markings in the diagram are as follows: 1. Testing machine housing; 2. Electric cylinder connecting guide sleeve; 3. Electric pressure cylinder; 4. Mounting and fixing base; 5. End cover flange; 6. Support roller bearing; 7. Support roller bearing housing; 8. Rotor shaft; 9. Loading roller bearing body; 10. Loading roller bearing housing; 11. Sliding bearing housing; 12. Oil seal; 13. Torque sensor; 14. Pressure sensor adapter; 15. Pressure sensor; 16. Buffer head; 17. Loading crossbar; 18. Sliding bearing body; 19. Bearing housing flange; 20. Eddy current displacement sensor; 21. Lever arm. Detailed Implementation

[0023] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0024] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0025] Example 1: This example provides a high-speed compressor bearing-rotor testing machine, including a testing machine housing 1. A loading port is opened on the upper surface of the testing machine housing 1. An electric cylinder connecting guide sleeve 2 is fixedly installed above the loading port. An electric pressure cylinder 3 is fixedly installed on the upper side of the electric cylinder connecting guide sleeve 2. A pressure sensor adapter 14 is fixedly installed at the output end of the electric pressure cylinder 3. A pressure sensor 15 is fixedly installed at the bottom of the rotor shaft 8 and the pressure sensor adapter 14. A buffer head 16 is fixedly installed on the lower side of the pressure sensor 15. A loading crossbar 17 is set below the buffer head 16. The loading crossbar 17 is slidably installed on the outer shell 1 of the testing machine. Two loading roller bearing seats 10 are fixedly installed on the lower side of the loading crossbar 17. Two loading roller bearing bodies 9 are fixedly installed on the inner walls of the two loading roller bearing seats 10. The rotor shaft 8 is fixedly installed on the inner ring of the two loading roller bearing bodies 9. The loading roller bearing bodies 9 are fixedly installed on the sliding bearing seat flange 19. The two sliding bearing seat flanges 19 are connected to both sides of the sliding bearing seat 11. A sliding bearing body 18 is fixedly installed on the inner wall of the sliding bearing seat 11.

[0026] The testing machine housing 1 is fixedly connected top and bottom by bolts to form a closed testing chamber. A loading port is provided on the surface of the upper part of the testing machine housing 1. An electric cylinder connecting guide sleeve 2 is fixedly installed inside the loading port. An electric pressure cylinder 3 (which can be a servo electric cylinder) is fixedly installed on the upper side of the electric cylinder connecting guide sleeve 2. A pressure sensor adapter 14 is fixedly installed at the downward-facing output end of the electric pressure cylinder 3. A pressure sensor 15 is fixedly installed at the bottom end of the pressure sensor adapter 14 for real-time monitoring of the applied load. A buffer head 16 is fixedly installed below the pressure sensor 15. The buffer head 16 contains a buffer spring and is composed of two sliding upper and lower sleeves. Damping exists between the sleeves to counteract the spring force, thereby reducing wear on the lead screw of the electric pressure cylinder 3 caused by vibration and external impact, and extending the service life of the electric pressure cylinder 3. A loading crossbar 17 is fixedly installed below the buffer head 16. Two loading roller bearing seats 10 are fixedly installed below the loading crossbar 17. Two loading roller bearing housings 10 are each fixedly mounted with a loading roller bearing body 9, for a total of two. The rotor shaft 8 passes through and is fixedly mounted on the inner ring of these two loading roller bearing bodies 9, meaning the rotor shaft 8 is supported by these two bearings. On the opposite sides of these two loading roller bearing bodies 9, a single sliding bearing housing 11 is fixedly mounted via two bearing housing flanges 19. The sliding bearing body 18 to be tested is fixedly mounted on the inner wall of the sliding bearing housing 11, and the rotor shaft 8 also passes through this sliding bearing. When a load test is required on the sliding bearing, the electric pressure cylinder 3 is activated. The electric pressure cylinder 3 pushes the pressure sensor adapter 14 downward, transmitting the force to the loading crossbar 17 through the pressure sensor 15 and the buffer head 16. The loading crossbar 17 transmits the downward force to the two loading roller bearing housings 10 and the loading roller bearing bodies 9 below it. Since the rotor shaft 8 is fixed on the inner ring of these two loading roller bearing bodies 9, this downward force will ultimately act on the rotor shaft 8 through the roller bearings, causing the rotor shaft 8 to undergo a downward flexural deformation. The downward-bending rotor shaft 8 will exert a downward load on the sliding bearing housing 11 and the sliding bearing body 18 mounted on it, which manifests as oil film pressure on the inner wall of the bearing. This avoids the problem of the loading head directly contacting the sliding bearing housing 11 and preventing it from rotating freely. By applying a bending moment to the rotor shaft 8 to indirectly load the sliding bearing body 18, the actual stress condition is simulated without affecting the free rotation of the sliding bearing housing 11 and the sliding bearing body 18, thus ensuring the authenticity and accuracy of the test data.

[0027] Example 2: This example provides a high-speed compressor bearing-rotor testing machine. In addition to the technical solutions of the above examples, it also has the following technical features: two support roller bearing seats 7 are fixedly installed on the inner wall of the outer shell 1 of the testing machine, and support roller bearings 6 are fixedly installed on the inner wall of the two support roller bearing seats 7. The rotor shaft 8 is fixedly installed on the two support roller bearings 6, and an oil seal 12 is fixedly installed on the outer side of each of the two support roller bearings 6.

[0028] Two support roller bearing seats 7 are fixedly installed on the inner wall of the outer shell 1 of the testing machine near both ends. Support roller bearings 6, usually angular contact ball bearings, are fixedly installed on the two support roller bearing seats 7. The two ends of the rotor shaft 8 are fixedly installed on the inner rings of these two support roller bearings 6, which provide the main high-speed rotation support for the rotor shaft 8, bear radial and part of the axial load, and ensure the stable rotation of the rotor shaft 8 at high speed. It is the basic operating platform of the testing machine. The high-precision bearings ensure that the rotor shaft 8 can rotate at high speed and smoothly, creating a stable basic condition for testing.

[0029] Example 3: This example provides a high-speed compressor bearing-rotor testing machine. In addition to the technical solutions of the above examples, it also has the following technical features: two detection holes are opened on the surface of the outer shell 1 of the testing machine, and an eddy current displacement sensor 20 is fixedly installed in each detection hole.

[0030] On the surface of the upper housing 1 of the testing machine, near the sliding bearing body 18, two detection holes with an included angle of 90 degrees are provided. Eddy current displacement sensors 20 are fixedly installed in each detection hole, with their non-contact probes facing the surface of the rotor shaft 8. During rotor rotation, the vibration amplitude and axis trajectory of the rotor shaft 8 can be monitored in real time. The eddy current displacement sensors 20 are highly accurate, have a fast response, and do not contact the rotating parts, thus avoiding interference with the testing system and accurately acquiring the dynamic motion information of the shaft.

[0031] Example 4: This example provides a high-speed compressor bearing-rotor testing machine. In addition to the technical solutions of the above examples, it also has the following technical features: a lever 21 is fixedly installed on the surface of the sliding bearing seat 11; an clearance opening is provided on the surface of the testing machine housing 1; one end of the lever 21 extends to the outside of the testing machine housing 1 through the clearance opening; a torque sensor 13 is fixedly installed on the surface of the testing machine housing 1; and one end of the lever 21 is located on the detection end of the torque sensor 13.

[0032] A lever 21 is fixedly mounted on the surface of the sliding bearing housing 11. A clearance opening is provided on the surface of the testing machine housing 1. One end of the lever 21 extends through this clearance opening to the outside of the testing machine housing 1. A torque sensor 13 is fixedly mounted on the outer surface of the testing machine housing 1. The end of the lever 21 extending out of the housing rests on or connects to the detection end of the torque sensor 13. When the sliding bearing body 18 rotates, it generates a frictional resistance torque. This torque acts on the sliding bearing housing 11, causing it to tend to rotate. This tendency is converted into a force by the lever 21 and acts on the torque sensor 13. By measuring this force and combining it with the length of the lever 21, the torque sensor 13 can calculate the frictional torque of the sliding bearing body 18.

[0033] Example 5: This example provides a high-speed compressor bearing-rotor testing machine. In addition to the technical solutions of the above examples, it also has the following technical features: end cover flanges 5 are fixedly installed on both sides of the outer shell 1 of the testing machine.

[0034] The fixed end cover flange 5 forms a seal to prevent the lubricating oil inside the test machine housing 1 from leaking from the shaft end, ensuring the sealing of the lubrication system, maintaining sufficient oil, and keeping the test environment clean.

[0035] Example 6: This example provides a high-speed compressor bearing-rotor testing machine. In addition to the technical solutions of the above examples, it also has the following technical features: a mounting base 4 is fixedly installed on the lower side of the outer shell 1 of the testing machine.

[0036] The entire testing machine is securely mounted on a stable foundation platform by installing mounting bracket 4.

[0037] Working principle: When testing the sliding bearing body 18, the rotor shaft 8 is started first to make it rotate at high speed. Then, the electric pressure cylinder 3 is started. The output end of the electric pressure cylinder 3 moves downward and drives the pressure sensor 15 and the buffer head 16 to move downward synchronously through the pressure sensor adapter 14. The buffer head 16 drives the loading crossbar 17 to apply the loading force downward, and transmits the loading force to the loading roller bearing seat 10, so that it is applied to the loading roller bearing body 9, giving the testing machine a certain pressure test environment. During the test, two eddy current displacement sensors 20 are used to detect the vibration signal of the sliding bearing and the displacement trajectory data of the shaft center. When the sliding bearing seat 11 rotates, the power arm 21 rotates. The torque sensor 13 at the other end of the power arm 21 detects the magnitude of the torque generated during the rotation and collects the data. The pressure sensor 15 detects the released loading force in real time, thereby completing the test of the sliding bearing body 18.

[0038] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A high-speed compressor bearing-rotor testing machine, characterized in that, include: The outer shell (1) of the testing machine has a loading port on the upper surface. An electric cylinder connecting guide sleeve (2) is fixedly installed above the loading port. An electric pressure cylinder (3) is fixedly installed on the upper side of the electric cylinder connecting guide sleeve (2). A pressure sensor adapter (14) is fixedly installed at the output end of the electric pressure cylinder (3). The rotor shaft (8) has a pressure sensor (15) fixedly installed at the bottom of the pressure sensor adapter (14). A buffer head (16) is fixedly installed on the lower side of the pressure sensor (15). A loading crossbar (17) is provided below the buffer head (16). The loading crossbar (17) is slidably installed on the outer shell (1) of the testing machine. Two loading roller bearing seats (10) are fixedly installed on the lower side of the loading crossbar (17). Two loading roller bearing bodies (9) are fixedly installed on the inner walls of the two loading roller bearing seats (10). The rotor shaft (8) is fixedly installed on the inner ring of the two loading roller bearing bodies (9). The loading roller bearing bodies (9) are fixedly installed on the sliding bearing seat flange (19). The two sliding bearing seat flanges (19) are connected to both sides of the sliding bearing seat (11). A sliding bearing body (18) is fixedly installed on the inner wall of the sliding bearing seat (11).

2. The high speed compressor bearing-rotor test machine of claim 1, wherein, The inner wall of the outer shell (1) of the test machine is fixedly installed with two support roller bearing seats (7), and the inner wall of the two support roller bearing seats (7) is fixedly installed with support roller bearings (6). The rotor shaft (8) is fixedly installed on the two support roller bearings (6), and an oil seal (12) is fixedly installed on the outer side of each of the two support roller bearings (6).

3. The high speed compressor bearing-rotor test machine of claim 1, wherein, The surface of the outer shell (1) of the testing machine has two threaded holes at 90 degrees, and an eddy current displacement sensor (20) is fixedly installed on the threaded holes.

4. The high speed compressor bearing-rotor test machine of claim 1, wherein, A lever arm (21) is fixedly installed on the sliding bearing seat (11). A clearance opening is provided on the surface of the test machine housing (1). One end of the lever arm (21) extends to the outside of the test machine housing (1) through the clearance opening. A torque sensor (13) is fixedly installed on the surface of the test machine housing (1). One end of the lever arm (21) is located on the detection end of the torque sensor (13).

5. The high speed compressor bearing-rotor test machine of claim 1, wherein, Both sides of the outer shell (1) of the testing machine are fixedly installed with end cover flanges (5).

6. The high speed compressor bearing-rotor test machine of claim 1, wherein, A mounting base (4) is fixedly installed on the lower side of the outer shell (1) of the testing machine.

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