Oil film pressure testing mechanism of fan main shaft bearing testing machine

Abstract

The utility model discloses an oil film pressure testing mechanism of a fan main shaft bearing testing machine, belongs to the field of fan bearing testing, solves the problems that the existing oil film pressure testing mechanism is incomplete in testing and inconvenient to install, and is suitable for the fan main shaft bearing testing machine. The fan main shaft bearing testing machine comprises a main shaft and a tested bearing, the main shaft can rotate relative to the tested bearing, the oil film pressure testing mechanism comprises an oil film pressure sensor arranged on the main shaft, and the oil film pressure sensor is used for detecting the oil film pressure at the contact position of the tested bearing and the main shaft when the main shaft rotates. According to the utility model, the oil film pressure test is more comprehensive, and the test mechanism is more convenient to install.

Description

TECHNICAL FIELD

[0001] The utility model relates to fan bearing test field especially a kind of oil film pressure test mechanism of fan main shaft bearing testing machine. BACKGROUND

[0002] Fan main shaft bearing testing machine has the function of simulating the actual operation condition of fan, and can carry out test work on the service life of bearing under various conditions, including different rotating speed, load, temperature and lubrication condition. During the operation of fan main shaft bearing, when the main shaft rotates relative to the measured bearing, lubricating oil will be brought into the gap between them. With the rotation of shaft neck and the viscosity of lubricating oil, a continuous oil film will be formed in the contact area of shaft neck and bearing. The oil film can generate corresponding supporting force on the shaft neck to balance the external load. It can be said that having sufficient and stable oil film pressure is the key to ensure the normal, efficient and long-time stable operation of bearing.

[0003] Based on the above situation, in the prior art, such as invention patent CN102937488A and CN102539056A, etc., disclose the related content about oil film pressure test mechanism, which sets oil film pressure sensor on bearing, however, this way has certain limitation. On the one hand, only the pressure data of a certain point can be obtained through the sensor, and it is difficult to fully understand the overall situation of oil film pressure at the contact position of entire bearing and main shaft, on the other hand, due to the relatively compact internal structure of bearing, the available space is very limited, which makes the whole process of installing oil film pressure sensor quite complex, and brings many inconvenience to actual operation. UTILITY MODEL CONTENT

[0004] The purpose of the utility model is to provide a kind of oil film pressure test mechanism of fan main shaft bearing testing machine, solve the problem that the test of existing oil film pressure test mechanism is not comprehensive and the test mechanism is inconvenient to install, make the oil film pressure test more comprehensive, and make the test mechanism installation more convenient.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme: a kind of oil film pressure test mechanism of fan main shaft bearing testing machine is suitable for fan main shaft bearing testing machine, the fan main shaft bearing testing machine includes main shaft and measured bearing, the main shaft can rotate relative to measured bearing, the oil film pressure test mechanism includes oil film pressure sensor arranged on the main shaft, and the oil film pressure sensor is used to detect the oil film pressure at the contact position of measured bearing and main shaft when the main shaft rotates.

[0006] The utility model discloses the following advantages are had after adopting the above technical scheme: first, the oil film pressure sensor is installed on the main shaft, and the main shaft can rotate relative to the measured bearing, can measure the oil film pressure of the whole contact position of the main shaft and the measured bearing as far as possible, makes the measurement data more abundant, more comprehensive, second, compared with the oil film pressure sensor installed in the measured bearing, the main shaft surface usually has relatively more abundant space for the oil film pressure sensor to settle, and the installation process is relatively simple, reduces the installation difficulty and installation cost, and also facilitates the subsequent maintenance and overhaul work.

[0007] Further, the measured bearing is in contact with the circumferential surface of the main shaft, and the oil film pressure sensor is located on the circumferential surface of the main shaft.

[0008] By adopting the foregoing technical scheme, since the oil film bears the main rotating load and friction force in the circumferential direction, the oil film pressure sensor can more accurately capture the pressure data of the oil film in the key stress direction at this position, avoids data distortion caused by deviation of the measurement position, and compared with some indirect measurement or measurement at a non-critical position, the data obtained can more reflect the supporting capacity of the oil film to the load and the lubricating effect in actual work, thereby providing more direct and reliable data basis for accurately evaluating the running state of the measured bearing.

[0009] Further, the oil film pressure sensor is provided with at least two, and the at least two oil film pressure sensors are arranged at intervals.

[0010] By adopting the foregoing technical scheme, the multiple oil film pressure sensors arranged at intervals can obtain oil film pressure data at multiple positions, and the situation of the oil film pressure on the circumferential surface of the main shaft can be more comprehensively understood.

[0011] Further, the at least two oil film pressure sensors are arranged in the axial direction along the circumferential surface of the main shaft.

[0012] By adopting the foregoing technical scheme, when the multiple oil film pressure sensors are arranged in the axial direction along the circumferential surface of the main shaft, the distribution of the oil film pressure in the axial direction can be more comprehensively measured.

[0013] Further, the at least two oil film pressure sensors are arranged in the circumferential direction along the circumferential surface of the main shaft.

[0014] By adopting the foregoing technical scheme, in the actual operation of the fan main shaft, due to the comprehensive influence of various factors, the oil film pressure is not uniformly distributed in the circumferential direction, and when the multiple oil film pressure sensors are arranged in the circumferential direction along the circumferential surface of the main shaft, the distribution of the oil film pressure in the circumferential direction can be more detailedly measured.

[0015] Further, the installation height of the oil film pressure sensor is at most flush with the circumferential surface of the main shaft.

[0016] By the above technical solution, when the installation height of the oil film pressure sensor is at most flush with the circumferential surface of the main shaft, the interference to the oil film shape and pressure distribution can be minimized. If the oil film pressure sensor protrudes from the surface of the main shaft, the flow state of the lubricating oil between the main shaft and the measured bearing will be changed, which will further affect the formation of the oil film and the pressure distribution.

[0017] Further, the circumferential surface of the main shaft is provided with a mounting hole for mounting the oil film pressure sensor, and the oil film pressure sensor is mounted in the mounting hole.

[0018] By the above technical solution, the oil film pressure sensor is mounted in the mounting hole, which can be firmly fixed on the surface of the main shaft, reducing the possibility of displacement or loosening of the oil film pressure sensor due to external force, thereby ensuring the reliability of the obtained oil film pressure data as much as possible.

[0019] Further, the oil film pressure sensor is detachably connected in the mounting hole.

[0020] By the above technical solution, in the long-term test process, the oil film pressure sensor may fail due to long-term use, harsh working environment (such as high temperature, high humidity, strong vibration, etc.) or other unexpected factors. When the oil film pressure sensor is detachably connected in the mounting hole, once it fails, it can be easily detached from the mounting hole for maintenance or replacement or cleaning.

[0021] Further, the main shaft is provided with a drainage hole, and the drainage hole is in communication with the oil film pressure sensor.

[0022] By the above technical solution, the existence of the drainage hole ensures that the oil film pressure can be effectively transmitted to the oil film pressure sensor, so that the pressure signal received by the oil film pressure sensor is more stable and accurate.

[0023] Further, the main shaft comprises an inner ring and an outer ring, the outer ring is in contact with the measured bearing, and the oil film pressure sensor is extended into the outer ring from the inner ring.

[0024] By the technical scheme, the main shaft is usually nodular cast iron, and the diameter of the main shaft is large, so the cost of the whole main shaft is high if the whole main shaft is made of nodular cast iron, the split type design divides the main shaft into an inner ring and an outer ring, only the outer ring is made of nodular cast iron, and the inner ring can be made of a relatively low-cost material according to actual stress and functional requirements, so that the material cost of the whole main shaft can be greatly reduced, and when the outer ring is worn, only the worn outer ring needs to be disassembled. The oil film pressure sensor is inserted into the outer ring from the inner ring, and the oil film pressure and the wear condition of the outer ring can be monitored simultaneously, because the change of the oil film pressure is closely related to the wear of the outer ring, with the increase of the wear degree of the outer ring, the oil film thickness and pressure distribution can be changed, and the change of the pressure data monitored by the oil film pressure sensor can indirectly infer the wear condition of the outer ring, so that the measured bearing and the outer ring can be monitored cooperatively. BRIEF DESCRIPTION OF DRAWINGS

[0025] The utility model will be further described below in combination with the drawings:

[0026] Fig. 1 It is the structure schematic diagram of oil film pressure test mechanism of fan main shaft bearing testing machine in the utility model;

[0027] Fig. 2 It is the structure schematic diagram of main shaft in the utility model;

[0028] Fig. 3 It is the sectional view of main shaft in the utility model;

[0029] In the drawing, 10, platform;20, main shaft;21, inner ring;22, outer ring;23, mounting hole;30, oil film pressure sensor;40, measured bearing. DETAILED DESCRIPTION

[0030] To make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0031] The terms "first", "second", "third", "fourth" and the like (if exist) in the description and claims of the utility model and the above drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be exchanged under appropriate circumstances, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein.

[0032] It should be understood that in various embodiments of the present application, the size of the sequence number as related to each process does not mean the order of execution, and the execution order of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0033] It should be understood that in the present application, "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0034] It should be understood that in the present application, "multiple" means two or more. "And / or" is only a description of the relationship between the associated objects, which means that there can be three relationships, for example, X and / or Y can represent the three cases of X alone, X and Y together, and Y alone. The character " / " generally represents an "or" relationship between the associated objects before and after it. "Including X, Y and Z", "including X, Y, Z" means that X, Y and Z are all included, "including X, Y or Z" means that one of X, Y and Z is included, "including X, Y and / or Z" means that any one or any two or three of X, Y and Z is included.

[0035] The technical scheme of the present application will be described in detail below with specific examples. The following specific examples can be combined or replaced according to actual conditions, and the same or similar concepts or processes may not be described in some embodiments.

[0036] As shown in Figs. 1 to 3 The utility model provides a kind of oil film pressure test mechanism of fan main shaft bearing testing machine, it is suitable for fan main shaft bearing testing machine, fan main shaft bearing testing machine includes platform 10, is set on platform 10 main shaft 20 and measured bearing 40, main shaft 20 can rotate relative to measured bearing 40, oil film pressure test mechanism includes the oil film pressure sensor 30 being set on main shaft 20, and oil film pressure sensor 30 is used to detect the oil film pressure of the contact position of measured bearing 40 and main shaft 20 when main shaft 20 rotates.

[0037] Firstly, the oil film pressure sensor 30 is installed on the main shaft 20, which can rotate relative to the measured bearing 40, so as to measure the oil film pressure of the whole contact position of the main shaft 20 and the measured bearing 40 as much as possible, so that the measurement data is more abundant and comprehensive. Secondly, compared with installing the oil film pressure sensor 30 in the measured bearing 40, the surface of the main shaft 20 generally has relatively more abundant space for the oil film pressure sensor 30 to be arranged, the installation process is relatively simple, the installation difficulty and cost are reduced, and the subsequent maintenance and repair work is also facilitated.

[0038] It should be noted that the measured bearing 40 can be a rolling bearing or a sliding bearing, and is not limited to a specific bearing. Further, the measured bearing 40 can be the whole sliding bearing or a certain bearing bush of the sliding bearing.

[0039] Since the measured bearing 40 is in contact with the circumferential surface of the main shaft 20, the oil film bears the main rotating load and friction in the circumferential direction, and the oil film pressure sensor 30 is located on the circumferential surface of the main shaft 20, so that the pressure data of the oil film in the key stress direction can be more accurately captured, and the data distortion caused by the deviation of the measurement position is avoided. Compared with some indirect measurement or measurement in a non-critical position, the data obtained can more reflect the support capacity of the oil film to the load and the lubrication effect in the actual work, thereby providing more direct and reliable data basis for accurately evaluating the running state of the measured bearing 40.

[0040] In order to further improve the test accuracy, the oil film pressure sensor 30 is provided with at least two, and the at least two oil film pressure sensors 30 are arranged at intervals. In the embodiment, the oil film pressure sensor 30 is provided with three, and the multiple oil film pressure sensors 30 arranged at intervals can obtain oil film pressure data at multiple positions, so that the situation of the oil film pressure on the circumferential surface of the main shaft 20 can be more comprehensively understood.

[0041] Further, the three oil film pressure sensors 30 are arranged in the axial direction along the circumferential surface of the main shaft 20. When the multiple oil film pressure sensors 30 are arranged in the axial direction along the circumferential surface of the main shaft 20, the distribution of the oil film pressure in the axial direction can be more comprehensively measured.

[0042] If the oil film pressure sensor 30 protrudes from the surface of the main shaft 20, the flow state of the lubricating oil between the main shaft 20 and the measured bearing 40 will be changed, and then the formation and pressure distribution of the oil film will be affected. Therefore, in the embodiment, the installation height of the oil film pressure sensor 30 is at most flush with the circumferential surface of the main shaft 20, so that the interference with the oil film shape and pressure distribution can be reduced to the maximum extent.

[0043] Specifically, the circumferential surface of the main shaft 20 is provided with a mounting hole 23 for mounting the oil film pressure sensor 30, and the oil film pressure sensor 30 is arranged in the mounting hole 23. By mounting the oil film pressure sensor 30 in the mounting hole 23, the oil film pressure sensor 30 can be hidden and firmly fixed on the surface of the main shaft 20, reducing the possibility of displacement or loosening of the oil film pressure sensor 30 due to external force, thereby ensuring the reliability of the obtained oil film pressure data as much as possible.

[0044] Further, the main shaft 20 is provided with a drainage hole, which is in communication with the oil film pressure sensor 30. The presence of the drainage hole ensures that the oil film pressure can be effectively transmitted to the oil film pressure sensor 30, making the pressure signal received by the oil film pressure sensor 30 more stable and accurate.

[0045] Since the main shaft 20 is usually made of nodular cast iron, and the diameter of the main shaft 20 is large, the overall cost of using nodular cast iron is high. Therefore, in the present embodiment, the main shaft 20 comprises an inner ring 21 and an outer ring 22, the outer ring 22 is in contact with the measured bearing 40, only the outer ring 22 is made of nodular cast iron, and the inner ring 21 can be made of a relatively low-cost material according to the actual stress and functional requirements. In this way, the material cost of the entire main shaft 20 can be greatly reduced. When the outer ring 22 is worn out, only the worn outer ring 22 needs to be removed. The oil film pressure sensor 30 extends into the outer ring 22 from the inner ring 21, and can monitor the oil film pressure and the wear condition of the outer ring 22 at the same time. Because the change of the oil film pressure is closely related to the wear of the outer ring 22, with the increase of the wear degree of the outer ring 22, the oil film thickness and pressure distribution may change. By monitoring the change of the pressure data monitored by the oil film pressure sensor 30, the wear state of the outer ring 22 can be indirectly inferred, and the measured bearing 40 and the outer ring 22 can be cooperatively monitored. It should be noted that the inner ring 21 can be made of alloy steel. The rigid inner ring 21 ensures the overall rigidity and anti-deformation ability of the main shaft 20. The oil film pressure sensor 30 extends into the outer ring 22 from the inner ring 21 and is tightened with a special tool.

[0046] During the long-term test process, the oil film pressure sensor 30 may fail due to long-term use, harsh working environment (such as high temperature, high humidity, strong vibration, etc.) or other unexpected factors. In order to facilitate disassembly, the oil film pressure sensor 30 is detachably connected in the mounting hole 23. Once a failure occurs, the staff can conveniently disassemble it from the mounting hole 23 for maintenance or replacement or cleaning.

[0047] It should be noted that the test mechanism can further include a display for displaying the oil film pressure. The data line of the oil film pressure sensor 30 is led out from the center through hole of the main shaft 20, connected to the slip ring, and rotates with the main shaft 20 when the main shaft 20 rotates. The data line of the oil film pressure sensor 30 is connected to the display to realize the visualization of the oil film pressure.

[0048] It can be understood that in other embodiments, the oil film pressure sensor can be provided with two, four, five, six or other appropriate number of sensors to realize multi-point measurement.

[0049] In the actual operation of the fan main shaft, the oil film pressure is not uniformly distributed in the circumferential direction due to the comprehensive influence of various factors.

[0050] In addition to the preferred embodiments described above, the utility model also has other implementation manners, and all other embodiments obtained by those skilled in the art based on the embodiments in the utility model without creative labor belong to the range of the utility model claimed.

Claims

1. An oil film pressure testing mechanism of a fan main shaft bearing tester, which is adapted to a fan main shaft bearing tester, the fan main shaft bearing tester comprising a main shaft and a bearing to be tested, the main shaft being rotatable relative to the bearing to be tested, characterized in that, The oil film pressure testing mechanism comprises an oil film pressure sensor arranged on the main shaft, which is used to detect the oil film pressure at the contact position between the bearing under test and the main shaft during rotation of the main shaft.

2. The oil film pressure testing mechanism of the fan main shaft bearing tester according to claim 1, characterized by, The bearing under test is in contact with the circumferential surface of the main shaft, and the oil film pressure sensor is arranged on the circumferential surface of the main shaft.

3. The oil film pressure testing mechanism of the fan main shaft bearing tester according to claim 2, characterized by, The oil film pressure sensor is arranged in at least two, and the at least two oil film pressure sensors are arranged at intervals.

4. The oil film pressure testing mechanism of the fan main shaft bearing tester according to claim 3, characterized by, The at least two oil film pressure sensors are arranged in the axial direction of the circumferential surface of the main shaft.

5. The oil film pressure testing mechanism of the fan main shaft bearing tester according to claim 3, wherein The at least two oil film pressure sensors are arranged in the circumferential direction of the circumferential surface of the main shaft.

6. The oil film pressure testing mechanism of the fan main shaft bearing tester according to claim 2, characterized by, The installation height of the oil film pressure sensor is at most flush with the circumferential surface of the main shaft.

7. The oil film pressure testing mechanism of the fan main shaft bearing tester according to claim 6, wherein The circumferential surface of the main shaft is provided with a mounting hole for mounting the oil film pressure sensor, and the oil film pressure sensor is arranged in the mounting hole.

8. The oil film pressure testing mechanism of the fan main shaft bearing tester according to claim 7, characterized by, The oil film pressure sensor is detachably connected in the mounting hole.

9. The oil film pressure testing mechanism of the fan main shaft bearing tester according to claim 1, wherein The main shaft is provided with a drainage hole, and the drainage hole is in communication with the oil film pressure sensor.

10. The oil film pressure testing mechanism of the fan main shaft bearing tester according to claim 1, wherein The main shaft comprises an inner ring and an outer ring, the outer ring is in contact with the bearing under test, and the oil film pressure sensor is arranged on the outer ring by the inner ring.

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